LAB GRUPPEN C164 Dedicated Amplifiers Instruction Manual
- June 14, 2024
- Lab gruppen
Table of Contents
- C164 Dedicated Amplifiers
- Specifications
- Important Safety Instructions
- Approvals
- Warnings
- User Responsibility Mains Connection Grounding
- Speaker Output Hazard on Amplifiers
- Radio Interference
- Speaker Damage
- Maintenance
- 1. Introduction
- 2. Installation
- 3. Product Overview
- FAQ
- Q: Can I use the amplifier near water?
- Q: Can I clean the amplifier with a wet cloth?
- Q: Can I connect or disconnect speaker cables while the mains
- Q: How can I prevent speaker damage?
- Q: How should I clean and maintain the amplifier?
- References
- Read User Manual Online (PDF format)
- Download This Manual (PDF format)
C164 Dedicated Amplifiers
Specifications
- Model: C 88:4, C 68:4, C 48:4, C 28:4, C 16:4
- Rev: 3.0.0
- Type: Dedicated Installation Amplifiers
Important Safety Instructions
-
Read these instructions.
-
Keep these instructions.
-
Heed all warnings.
-
Follow all instructions.
-
Do not use this apparatus near water.
-
Clean only with a dry cloth.
-
Do not block any ventilation openings. Install in accordance
with the manufacturer’s instructions. -
Do not install near any heat sources such as radiators,
heat
Approvals
This equipment conforms to the requirements of the EMC Directive
2014/30/EC and the requirements of the Low Voltage Directive
2014/35/EC.
Standards applied:
-
EMC Emission EN55103-1, E3
-
EMC Immunity EN55103-2, E3, with S/N below 1% at normal
operation level. -
Electrical Safety EN60065, Class I
This equipment is tested and listed according to the U.S. safety
standard ANSI/ UL 60065 and Canadian safety standard CSA C22.2 NO.
60065. Intertek made the tests and they are a Nationally Recognized
Testing Laboratory (NRTL).
Warnings
The lightning bolt triangle is used to alert the user to the
presence of un-insulated dangerous voltages within the unit’s
chassis that may be of sufficient magnitude to constitute a risk of
electric shock to humans.
The exclamation point triangle is used to alert the user to
presence of important operating and service instructions in the
literature accompanying the product.
User Responsibility Mains Connection Grounding
Your amplifier must be connected to a grounded socket
outlet.
Speaker Output Hazard on Amplifiers
Amplifiers are capable of producing hazardous output voltages.
To avoid electrical shock, do not touch any exposed speaker wiring
while the amplifier is operating. The external wiring connected to
the speaker terminals shall be installed by a qualified person, or
ready-made leads or cords of appropriate capacity shall be used. As
the power output channels on amplifiers produce high voltage, do
not connect or disconnect speaker cables when the mains power is
on.
Radio Interference
To minimize radio interference, ensure proper grounding and
shielding of all cables connected to the amplifier.
Speaker Damage
Amplifier apparatus is very powerful and can be potentially
dangerous to both loudspeakers and humans alike. Many loudspeakers
can be easily damaged or destroyed by overpowering them. Always
check the speaker’s continuous and peak power capabilities.
Although the amplifier’s attenuators can be used to reduce the
overall gain, an increase of the input signal can result in full
output power, which may cause damage to connected speakers.
Maintenance
The amplifier should be kept clean and free from dust. Use a dry
cloth for cleaning. Do not use any liquid or chemical cleaners on
the amplifier.
Product Usage Instructions
1. Introduction
1.1. Welcome
Welcome to the C Series Dedicated Installation Amplifiers. This
manual will guide you through the installation and operation of the
amplifier.
1.2. Main Features
The C Series amplifiers are designed for dedicated installation
applications. They provide high-quality audio amplification for
various audio systems.
2. Installation
2.1. Unpacking
When unpacking the amplifier, ensure that all the accessories
and components are included in the package. If anything is missing
or damaged, contact customer support.
2.2. Mounting
Mount the amplifier in a suitable location using the provided
mounting brackets. Ensure that the mounting surface is sturdy and
can support the weight of the amplifier.
2.3. Cooling
Proper cooling is essential for the amplifier’s performance and
longevity. Ensure that there is adequate ventilation around the
amplifier to prevent overheating. Do not block any ventilation
openings.
2.4. Operating Voltage
The amplifier is designed to operate within a specific voltage
range. Check the specifications to ensure that the operating
voltage matches the available power supply. Use a grounded socket
outlet for the amplifier’s power connection.
2.5. Grounding
Proper grounding is necessary for electrical safety. Connect the
amplifier to a grounded socket outlet to prevent electrical
shocks.
3. Product Overview
The C Series amplifiers feature multiple channels and are
designed for dedicated installation applications. They provide
high-quality audio amplification for various audio systems.
FAQ
Q: Can I use the amplifier near water?
A: No, the amplifier should not be used near water to avoid the
risk of electric shock.
Q: Can I clean the amplifier with a wet cloth?
A: No, the amplifier should only be cleaned with a dry cloth. Do
not use any liquid or chemical cleaners.
Q: Can I connect or disconnect speaker cables while the mains
power is on?
A: No, it is not safe to connect or disconnect speaker cables
while the mains power is on. Ensure that the power is turned off
before making any connections or disconnections.
Q: How can I prevent speaker damage?
A: To prevent speaker damage, always check the speaker’s
continuous and peak power capabilities. Do not overpower the
speakers and ensure that the amplifier’s gain is properly
adjusted.
Q: How should I clean and maintain the amplifier?
A: Clean the amplifier with a dry cloth to remove dust and
debris. Do not use any liquid or chemical cleaners as they may
damage the amplifier.
Rev. 3.0.0
Item no. OMCS
C SERIES
Dedicated Installation Amplifiers
C 88:4 C 68:4 C 48:4 C 28:4 C 16:4
Operation Manual
1. Important safety instructions
1. Important safety instructions
Before using the device, be sure to carefully read the Safety Instructions. Keep this document with the device at all times.
1. Read these instructions. 2. Keep these instructions 3. Heed all warnings.
4. Follow all instructions. 5. Do not use this apparatus near water. 6. Clean
only with a dry cloth. 7. Do not block any ventilation openings. Install in
accordance
with the manufacturer’s instructions. 8. Do not install near any heat sources
such as radiators, heat
registers, stoves, or other apparatus (including amplifiers) that produce
heat. 9. Do not defeat the safety purpose of the polarized or grounding-type
plug. A polarized plug has two blades with one wider than the other. A
grounding-type plug has two blades and a third grounding prong. The wide blade
or the third prong is provided for your safety. If the provided plug does not
fit into your outlet, consult an electrician for replacement of the obsolete
outlet. 10. Protect the power cord from being walked on or pinched,
particularly at plugs, convenience receptacles, and the point where they exit
from the apparatus. 11. Only use attachments/accessories specified by the
manufacturer. 12. Use only with a cart, stand, tripod, bracket, or table
specified by the manufacturer, or sold with the apparatus. When a cart is
used, use caution when moving the cart/apparatus combination to avoid injury
from tip-over. 13. Unplug this apparatus during lightning storms or when
unused for long periods of time. 14. Refer all servicing to qualified service
personnel. Servicing is required when the apparatus has been damaged in any
way, such as power-supply cord or plug is damaged, liquid has been spilled or
objects have fallen into the apparatus, the apparatus has been exposed to rain
or moisture, does not operate normally, or has been dropped. 15. Use the mains
plug to disconnect the appartus from the mains. 16. WARNING: To reduce the
risk of fire or electric shock, do not expose this apparatus to rain or
moisture. 17. Do not expose this equipment to dripping or splashing and ensure
that no objects filled with liquids, such as vases, are placed on the
equipment. 18. Do not connect the unit’s output to any other voltage source
such as battery, mains source, or power supply, regardless of whether the unit
is turned on or off. 19. Do not remove the top (or bottom) cover. Removal of
the cover will expose hazardous voltages. There are no user serviceable parts
inside and removal may void the warranty. 20. An experienced user shall always
supervise this professional audio equipment, especially if inexperienced
adults or minors are using the equipment. 21. The US National Differences
clause 16.3 requires that network cables must be flame rated VW-1.
1.1. Approvals
This equipment conforms to the requirements of the EMC Directive 2014/30/EC
and the requirements of the Low Voltage Directive 2014/35/EC.
Standards applied: EMC Emission EN55103-1, E3 EMC Immunity EN55103-2, E3, with
S/N below 1% at normal operation level. Electrical Safety EN60065, Class I
This equipment is tested and listed according to the U.S. safety standard
ANSI/ UL 60065 and Canadian safety standard CSA C22.2 NO. 60065. Intertek made
the tests and they are a Nationally Recognized Testing Laboratory (NRTL).
1.2. Warnings
1.2.1. Explanation of warning symbols
The lightning bolt triangle is used to alert the user to the presence of un-
insulated “dangerous voltages” within the unit’s chassis that may be of
sufficient magnitude to constitute a risk of electric shock to humans.
The exclamation point triangle is used to alert the user to presence of
important operating and service instructions in the literature accompanying
the product.
1.2.2. Warnings
To prevent electric shock do not remove top or bottom covers. No user
serviceable parts inside, refer servicing to qualified service personnel.
Français: À prévenir le choc électrique n’enlevez pas les couvercles. Il n’y a
pas des parties serviceable à l’intérieur, tous reparations doit etre faire
par personnel qualifié seulment.
2 C SERIES Operation Manual rev 3.0.0
1. Important safety instructions
To completely disconnect this equipment from the AC mains, disconnect the
power supply cord plug from the AC receptacle. The mains plug of the power
supply cord shall remain readily operable. Français: Pour démonter
complètement l’équipement de l’alimentation générale, démonter le câble
d’alimentation de son réceptacle. La prise d’alimentation restera aisément
fonctionnelle. To reduce risk of fire or electric shock, do not expose this
apparatus to rain or moisture. Français: Pour réduire les risques d’incendie
ou de choc électrique, n’exposez pas l’appareil à la pluie ou à l’humidité. Do
not expose this system/apparatus to dripping or splashing and ensure that no
objects filled with liquids, such as vases, are placed on the apparatus.
Français: N’exposez pas ce système/appareil au ruissellement ni aux
éclaboussures et assurez-vous qu’aucun objet contenant du liquide tel qu’un
vase n’est placé sur l’appareil. This apparatus must be connected to a mains
socket outlet with a protective earthing connection. Français: Cet appareil
doit être raccordé à une prise secteur avec terre de protection. The mains
plug is used as a disconnect device and shall remain readily operable.
Français: Lorsque la prise du réseau d’alimentation est utilisés comme
dispositif de déconnexion, ce dispositif doit demeuré aisément accessible.
1.2.3. Caution
To reduce the risk of fi re or electric shock, do not remove screws. No user-
serviceable parts inside. Refer servicing to qualified service personnel.
Français: Pour réduire le risque d’incendie ou de choc électrique, ne pas
retirer les vis. Aucune pièce réparable par l’utilisateur. Confier l’entretien
àpersonnel qualifié.
1.2.4. User responsibility Mains connection grounding
Your amplifier must be connected to a grounded socket outlet.
Speaker output hazard on amplifiers
Amplifiers are capable of producing hazardous output voltages. To avoid
electrical shock, do not touch any exposed speaker wiring while the amplifier
is operating. The external wiring connected to the speaker terminals shall be
installed by a qualified person, or ready-made leads or cords of appropriate
capacity shall be used. As the power output channels on amplifiers produce
high voltage, do not connect or disconnect speaker cables when the mains power
is on.
Radio interference
A sample of this product has been tested and complies with the limits for the
European Electro Magnetic Compatibility (EMC) directive. This equipment has
also been tested and found to comply with the limits for a Class A digital
device, pursuant to Part 15 of the FCC Rules. These limits are designed to
provide reasonable protection against harmful interference from electrical
equipment. This product uses radio frequency energy and if not used or
installed in accordance with these operating instructions, may cause
interference to other equipment, such as radio receivers.
This Class A digital apparatus complies with Canadian ICES-003. Cet appareil
numérique de la classe A est conforme à la norme NMB-003 du Canada.
However, there is no guarantee that interference will not occur in a
particular installation. If this equipment does cause harmful interference to
radio or television reception, which can be determined by turning the
equipment on and off, the user is encouraged to try to correct the
interference by one or more of the following measures: · Reorient or relocate
the antenna. · Increase the separation between the equipment and
receiver. · Connect the equipment to an outlet on a circuit different
from that to which the receiver is connected. · Check if the affected unit
complies with the EMC limits for
immunity, (CE-labeled). If not, address the problem with the manufacturer or
supplier. All electrical products sold in the EC must be approved for immunity
against electromagnetic fields, high voltage flashes, and radio interference.
· Consult the dealer or an experienced radio/TV technician for help.
Speaker damage
Amplifier apparatus is very powerful and can be potentially dangerous to both
loudspeakers and humans alike. Many loudspeakers can be easily damaged or
destroyed by overpowering them. Always check the speaker’s continuous and peak
power capabilities. Although the amplifiers attenuators can be used to reduce
the overall gain, an increase of the input signal can result in full output
power, which may cause damage to connected speakers.
Maintenance
For safe and reliable operation, the dust fi lters on both sides of the front
panel, behind the grilles, should be removed and cleaned regularly to ensure
maximum airflow through the device. If the dust filters are not maintained
there will be safety risks; for example, high internal temperatures could
ignite the dust and start a fire. There is also a risk that the unit will
malfunction since it is dependent on constant airflow from front to rear. If
the dust fi lters are not clean and the unit malfunctions, any resulting
problems will not be covered by the warranty.
C SERIES Operation Manual rev 3.0.0
3
Table of Contents
Table of Contents
1. Important safety instructions
2
1.1. Approvals
2
1.2. Warnings
2
2. Introduction
5
2.1. Welcome
5
2.2. Main Features
6
3. Installation
8
3.1. Unpacking
8
3.2. Mounting
8
3.3. Cooling
8
3.4. Operating Voltage
9
3.5. Grounding
9
4. Product Overview
10
4.1. Front Panel Overview
10
4.2. Rear panel
12
4.3. NomadLink / Ethernet network setup
13
5. Operation and performance
15
5.1. Introduction
15
5.2. Operation precautions
15
5.3. Signal flow and headroom
15
5.4. Audio Input and Output connections, setup and features
17
5.5. GPIO connection and operation
22
5.6. Front-panel monitoring
25
5.7. NomadLink network and DeviceControl software
27
6. Appendix
31
6.1. Maintenance
31
6.2. FAQ
31
6.3. Additional documentation
32
6.4. Current Draw and Thermal Dissipation Specifications
33
7. Technical Specifications
38
8. Warranty and Support
39
8.1. General
39
8.2. Technical assistance and service
39
4 C SERIES Operation Manual rev 3.0.0
2. Introduction
2. Introduction
2.1. Welcome
Thank you for choosing LAB GRUPPEN C Series power amplifiers for your sound
reinforcement system installation. We are confident that you will be very
pleased with the performance, configuration flexibility, reliability, and
long-term durability offered by the C Series products.
This manual provides a comprehensive guide to the features and functionality
of C Series model C 88:4, C 68:4, C 48:4, C 28:4 and C 16:4 amplifiers. Please
read through it in its entirely to become fully acquainted with the many
configuration options and multiple layers of protection circuitry.
To facilitate timely installation and use of this C Series product, we have
included a Quick Guide Overview (section 4). This brief summary, in
conjunction with Installation (section 3), contains the basic information
needed to safely install the amplifier and place it in service. However, we
highly recommend reading through this manual in its entirety, beginning with
Main Features and Technologies and continuing through Operation and
Performance. As you become thoroughly familiar with all aspects of operation,
you may learn of features or options that will affect your choices on
amplifier modes or loudspeaker system configuration.
LAB GRUPPEN C Series power amplifiers are designed and built specifically for
the unique demands of permanent installation applications. C Series amplifiers
offer the optimum combination of high-quality audio reproduction, flexible
features, ease of installation, and 100% reliability in normal use.
By packing four or eight channels of reconfigurable power amplification into a
2U chassis, the C Series achieves unprecedented power and channel density. The
benefits of compact dimensions include reduced rack space requirements and
minimal heat build-up. The flexible output stages enable each amplifier
channel to be set for either low impedance or constant voltage (70 V / 100 V)
mode. NomadLink, an easy-to-use network for monitoring and control, is
implemented as a standard feature on all C Series amplifiers.
Although C Series features and facilities are tailored to installation
applications, at the heart of each amplifier is the same advanced technology
that has made LAB GRUPPEN the benchmark of quality for touring concert
systems: exceptional sonic performance, rugged construction, proven
reliability, and protection features that anticipate every unwelcome
possibility.
NOTE: This manual is shipped with C Series amplifier models C 88:4, C 68:4, C
48:4, C 28:4 and C 16:4. All references to “C Series” in this manual apply to
all four of these models. A different manual is shipped with models C 20:8X, C
10:8X, C 10:4X and C 5:4X. References to C Series in this document may or may
not apply to these C…X models.
5 C SERIES Operation Manual rev 3.0.0
2. Introduction
2.2. Main Features
Your new C Series amplifier incorporates a number of sophisticated
technologies many of them proprietary to LAB GRUPPEN that are provided to
ensure the best possible performance and many years of reliable operation.
Familiarizing yourself with these technologies will prove invaluable in
setting up and optimizing your loudspeaker system.
2.2.1. Class TD amplifier and Regulated Switch Mode Power Supply (R.SMPS)
LAB GRUPPEN’s patented Class TD technology combines the exceptional efficiency
of a Class D amplifier with the high sonic quality associated with Class B
designs. Class TD also incorporates the same basic concepts behind Class H
designs, but here they are refined and pushed to a higher level to achieve
much greater efficiency. The Class TD output sections work in concert with LAB
GRUPPEN’s unique, regulated switch-mode power supply (R.SMPS) to create a
superior overall power amplifier topology. This ensures stable, full output
power over an extremely wide range of mains voltage levels. Sagging or
fluctuating mains voltage will not affect the power output delivered to the
loudspeakers.
2.2.2. Amplifier gain
For greater flexibility in system integration, C Series amplifiers allow gain
adjustment from +23 dB to +44 dB in 3 dB steps. This feature accommodates any
combination of input device and loudspeaker type. For example, if the input
signal is weak, the gain can be boosted to maintain maximum power output while
avoiding a poor signalto-noise ratio. This gain adjustment feature makes it
easier to achieve an optimal balance between headroom and noise floor.
2.2.3. Voltage Peak Limiter (VPL)
The Voltage Peak Limiter (VPL) feature allows user adjustments that determine
maximum voltage output, thus matching the amplifier to the connected speaker
load. Whether the connected load is low impedance (2 to 16 ohms) or high
impedance (70 V / 100 V), the VPL feature can be set to ensure that neither
temperature nor current limitations are exceeded before reaching the desired
voltage threshold.
2.2.4. Protection and performance optimization
Appropriate and reliable power amplification is vital to any audio system.
Inadequate or faulty power amplification could cause damage to the
loudspeakers, or in some cases to the power amplifiers themselves. To prevent
any damage or costly service interruptions, C Series amplifiers offer advanced
features to protect both internal circuits and any connected loads. These
features even protect the mains fuse that, in extreme cases, could be
overloaded.
6 C SERIES Operation Manual rev 3.0.0
2. Introduction
Following are short descriptions of standard built-in C Series protection
features:
· CPL (Current Peak Limiter) ensures that the amplifier’s output does not
exceed the safe current handling parameters of amplifier components.
· Temperature protection ensures that the amplifier will not be damaged by
exceeding thermal limits. · PAL (Power Average Limiter) limits the maximum
average power consumption according to the power supply
and mains-breaker capabilities. · VHF (Very High Frequency) protection
circuits mute the output of the amplifier when nondynamic continuous
signals above 10 kHz are detected. · DC protection ensures destructive DC
signals will not appear at the amplifier outputs. If such conditions occur
an internal fuse opens and fault indication is displayed. · Low-impedance
(short circuit) protection provides a fault warning indication and shuts down
the output stage
when, for example, an input signal is present and a malfunctioning cable or
driver is short circuiting the output. · High-impedance warning reports an
alert when, at the same time, output signal is high and no current draw is
measured. This situation might occur when no speakers are connected, or when a
driver is blown. · Low inrush current ensures that the mains breaker will not
trip when several power amplifiers are turned on
simultaneously.
2.2.6. NomadLink / Ethernet control and monitoring network
The NomadLink network allows easy setup and control of C Series power
amplifiers and other devices. The patented network topology allows automatic
detection and addressing of multiple amplifiers, and is controlled from a PC
via an NLB 60E NomadLink Bridge & Network Controller using standard TCP/IP
communication. Phantom powering through the network cables allows the software
to detect devices that are not currently turned on or connected to the mains.
This ensures very high reliability and redundancy levels while allowing
connected amplifiers to remain on standby with no power consumption.
Cable connections can be daisy-chained for easier system setup. This also
reduces total component costs, simplifies installation, and makes daily
operation more convenient. There is no need to create a star topology using
many switches as with, for example, an Ethernet system. Individual amplifier
addresses do not need to be manually entered: you will automatically know
where an individual amplifier resides in the network.
A daisy chain network-loop, in combination with the automatic addressing of
devices, enables LAB GRUPPEN’s proprietary DeviceControl software to
automatically create a precise picture of all connected devices and their
relative position in the chain. By quickly creating a clear overview of the
entire system configuration, DeviceControl provides flexible control over very
large amplifier systems. Set-up time is minimized, and critical information is
readily available for monitoring performance and solving problems during
operation.
Via NomadLink, you can simultaneously monitor all metering data as well as any
fault or warning indications.. NomadLink also allows you to remotely control
power on and power off, as well as engage Mute and Solo functions on
individual channels.
C SERIES Operation Manual rev 3.0.0
7
3. Installation
3. Installation
3.1. Unpacking
Carefully open the shipping carton and check for any noticeable damage. Every
LAB GRUPPEN amplifier is tested and inspected before leaving the factory and
should arrive in perfect condition. If any damage is discovered, please notify
the shipping company immediately. Only the consignee may institute a claim
with the carrier for damage incurred during shipping. Save the carton and
packing materials for the carrier’s inspection. Should you ever need to ship
the amplifier, always use the original packaging materials.
3.2. Mounting
The amplifier is two rack units high (2U) and will fit into a standard EIA 19″
rack. The depth is 343 mm (13.5″). The weight is approximately 8.5 kg (18.75
lbs.) depending on model type.
Free airflow from front-to-rear of the amplifier must be possible. Therefore,
no doors or rack-lids should be mounted in front of or behind the amplifiers.
Amplifiers may be stacked directly on top of each other. There is no need for
spacing in between units, though this might enable more convenient
installation of cabling on the rear panel.
3.3. Cooling
The amplifier uses a forced-air cooling system with air flow from front to
rear, maintaining a low operating temperature within defined limits. Front-to-
rear airflow is preferred as cooler air is present at the front in nearly all
applications. (This allows higher continuous power levels without encountering
thermal problems.) Never attempt to reverse the airflow. The amplifier modules
require a pressure chamber between the fans and heat sink, and this effect
functions only in one direction.
Make sure that there is an adequate air supply in front of the amplifier, and
that the rear of the amplifier has sufficient space to allow the exhaust to
escape. If the amplifier is rack-mounted, do not use covers or doors on the
front or rear of the rack.
Should a heat sink overheat, the temperature sensing circuits will mute the
overheating channel. If the power supply overheats, another sensing circuit
will mute all output channels until the power supply cools to safe operating
temperature. An early warning before shut down will be indicated on the front
panel LEDs, and a warning will be sent through the NomadLink network.
Always make sure that the dust-filters behind the detachable front panel are
clean to ensure maximum possible airflow.
NOTE: If the amplifier malfunctions due to dirty dust filters, any required
repairs are not covered by the warranty.
8 C SERIES Operation Manual rev 3.0.0
3. Installation
To calculate the maximum heat emission value when installing the amplifiers in rooms with an air-conditioning system, please refer to the Current Draw and Thermal Emissions specifications provided in the Appendix (section 6.4).
3.4. Operating Voltage
The label placed to the right of the mains cable on the rear of the amplifier
indicates the AC mains voltage for which the amplifier is wired and approved:
115 V or 230 V. Connect the power cable only to the AC source type referred to
on the label. The warranty will not cover damage caused by connecting to an
incorrect type of AC mains.
LAB GRUPPEN switch-mode amplifiers use primary switching. Because the mains power is rectified directly in front of the transformer, the amplifier is insensitive to mains frequency. It may be connected to 50 or 60 Hz sources, and actually will operate on line frequencies from DC to 400 Hz.
If the power plug mounted at the factory is not appropriate for your country, it can be removed and the proper connector wired in its place as follows:
BLACK or BROWN WHITE or BLUE GREEN or GREEN/YELLOW
LIVE NEUTRAL EARTH (GROUND)
If you are not 100% confident of your competence to replace the mains plug, engage qualified personnel to do the job.
Once a suitable AC supply is connected, the amplifier can be turned on using the front-panel power switch. The amplifier then goes through a soft-start sequence as it self-checks its circuits. The fans will blow at high speed before dropping to idle, and the “power” LED will illuminate.
Inrush power is controlled and limited during “soft start”, enabling multiple amplifiers to be powered up simultaneously.
3.5. Grounding
There is no ground lift switch or terminal on the C Series amplifiers. The
signal ground is always floating, via a resistor, to chassis and therefore the
grounding system is automatic.
In the interests of safety, never disconnect the earth (ground) pin on the AC
power cord.
Use balanced input connections to avoid hum and interference.
9 C SERIES Operation Manual rev 3.0.0
4. Product Overview
4. Product Overview
4.1. Front Panel Overview
The amplifier’s front panel presents the performance and fault condition
indicators, power and remote switches, and a removable dust-filter cover. Four
level potentiometers located behind the cover provide individual attenuation
for the four amplifier channels. Range is 0 dB to – infinity. The 12 o’clock
position indicates -10 dB attenuation. A label area is located beneath the LED
display. To remove the dust-filter cover, loosen the thumbscrew at the far
left. This allows removal of the dust-filters for cleaning, and provides
access to channel attenuation. The front cover may be made “tamper resistant”
by replacing the thumbscrew with a Philips head or safety Torx screw. Thread
size is M3.
NOTE: Never operate the amplifier without the dust-filters in place.
4.1.1. Power on/off and remote switch
The Power on/off switch is located on the right side. A second switch, labeled
“REMOTE,” is located above the Power switch. When the Remote switch is on,
(with the mains connected and power switch turned on) the yellow LED above it
will illuminate indicating that external power on/off commands from the
NomadLink network connection will switch the amplifier on or off. When Remote
is activated the amplifier will not switch on until a “Power On” command is
received from the network. When the remote switch is off, it is not possible
to switch amplifier power on or off using NomadLink network control.
10 C SERIES Operation Manual rev 3.0.0
4.1.2. Front-panel LED’s
The front-panel LED area includes the following indicators per channel:
4. Product Overview
· Temperature mute (Yellow constant) · VHF (Very High Frequency) protection
active (output muted) (Yellow) · Mute channel via NomadLink network (2x
Yellow) · CPL (Current Peak Limiter) active (Orange flashing) · CPL (Orange
constant with output muted): constant (output muted): Low impedance / short
circuit
detection · Fault (Yellow plus Orange) · VPL (Voltage Peak Limiter) active,
VPL/Clip (Red) · 4 dB signal level (Green) · -10 dB signal level (Green) · -40
dB signal level (Green) · Hi-Imp open load detected (Red) · Bridge mode
operation on (Yellow). Ch. A+B, C+D, E+F, G+H bridged.
(PWR) Power on (Green) (PAL) Power Average Limiter active (Red)
PAL
Option active (Yellow) NomadLink network active (Blue)
NOTE: When no VPL, CPL or PAL indicators are illuminated, and the VPL DIP-
switch is set to maximum at the specified nominal load, the amplifier channel
is able to deliver maximum rated output power.
NOTE: When the network is connected, the blue NomadLink LED will illuminate
even when mains power is not connected. NomadLink receives phantom power from
the network supplied by the NLB 60E.
11 C SERIES Operation Manual rev 3.0.0
4. Product Overview 4.2. Rear panel
C 88:4 200-240V 50-60Hz :2500W
Must be grounded/earthed Made in Sweden
44dB 41dB 38dB 35dB 32dB 29dB 26dB 23dB
141V*
71V
118V
59V
100V**
50V
85V
42V
CH D
Ser. N:o Removed!
BALANCED INPUTS
CH C
CH B
CH A
*100Vrms
**70Vrms
SPEAKER OUTPUTS
WIRING NORMAL: CLASS 2 BRIDGED: CLASS 3
Mains input 115 V and 230 V operation
(Not selectable)
NomadLink network In and Out on
EtherCon-housed RJ45 connections
DIP-switches for adjusting key features
(see below)
3-pole Phoenix input connectors
2-pole screw terminal output
connections
4.2.1. The DIP-switch features
The following features may be adjusted using the DIP-switches on the rear-
panel of the amplifier. Gain – Set for all four or eight channels from +29 to
+38 dB in 3 dB steps. Fan Masked – When on, engages the intelligent fan
feature; fan speed is lowered when no signal is present. Bridge Mode –
Switches the channel pairs into bridge mode operation. An automatic -6 dB gain
compensation is applied. VPL – Voltage Peak Limiter adjustment is provided for
8 individual levels. Select the setting most appropriate for connected
speakers. See Appendix for details. Mode – Select VPL mode between Hard and
Soft. For channels driving sub-woofers and low-end frequencies, it is
recommended to use the Hard setting for optimal operation. For mid- and high-
frequency drivers, always select Soft.
12 C SERIES Operation Manual rev 3.0.0
4. Product Overview
4.3. NomadLink / Ethernet network setup
The amplifier includes, as a standard feature, internal facilities for the
NomadLink monitoring and control network. All features of the NomadLink
network are accessible via a PC running LAB GRUPPEN’s proprietary
DeviceControl software. A single rackspace NLB 60E NomadLink Bridge & Network
Controller accepts the TCP/IP data stream from the computer and converts it to
the NomadLink protocols. Even when no computer is connected, the NLB 60E can
initiate stand-alone power on/off and muting functions, as well as report any
fault or warning conditions. The PC is connected to the NLB 60E using a
standard Ethernet interface and a crossed Cat-5 cable (peer-topeer setup). If
a hub or switch is in the network, standard “straight” Cat-5 cables must be
used. The front and rear Ethernet connections on the NLB 60E can be used
individually, but only one PC at a time running DeviceControl can access the
subnet.
NOTE: Many newer laptop computers will allow peer-to-peer connection with the
NLB 60E using a standard “straight” Cat-5 cable instead of a crossed cable.
The default fixed TCP/IP address of the NLB 60E is 192.168.1.166. The subnet
mask is 255.255.255.0. For further system configuration details, please refer
to instructions supplied with the NLB 60E unit. The NomadLink connections
between amplifiers use standard “straight” Cat-5/RJ45 equipped cables.
NOTE: US National Differences cl.16.3 requires that NomadLink network cables
must be rated VW-1.
The OUT port from the NLB 60E must be connected to the IN port of the first
amplifier. The OUT port from the first amplifier in turn connects to the next
amplifier’s IN port to form a daisy-chain The OUT port on the last amplifier
is connected to the IN port on the NLB 60E to close the loop.
NOTE: There are performance limitations to cable lengths on a NomadLink
network, both in terms of total cable length in the loop and between any two
devices. These limitations follow standard Ethernet cabling protocols. Read
the Operation and Performance chapter in this manual, or the Operation Manual
supplied with the NLB 60E, to ensure the network is configured within these
constraints.
TIP: Although the network will function as an open loop under most
circumstances, it is strongly recommended that the loop be closed by
connecting the last amplifier’s OUT port to the NLB 60E’s IN port. Doing so
will improve redundancy and communication speed.
External contact closures and 24 V low/high triggers can be connected to the
GPI connectors on the NLB 60E for control of fire-alarm systems or external
power sequencers. For more details read the instructions supplied with the NLB
60E.
13 C SERIES Operation Manual rev 3.0.0
4. Product Overview
GENERAL NOMADLINK PURPOSE ETHERNET IN OUT INPUT, GPI
ETHERNET
1
1
Crossed RJ45 Ethernet cable between NLB 60E and PC. If bridge is connected to
switch of HUB, use ” straight ” cable. PC can also be connected on front
panel.
2
” Straight ” RJ45 cables between bridge and amplifiers
IN OUT NOMADLINK 2
IN OUT NOMADLINK
14 C SERIES Operation Manual rev 3.0.0
5. Operation and performance
5. Operation and performance
5.1. Introduction
The following sections provide comprehensive information on amplifier
connection, setup, operation, and performance. The detailed information
included here is essential to realizing the full functionality of the C Series
amplifiers.
5.2. Operation precautions
· Make sure that the Power switch and the Remote switch on the amplifier
front-panel are set to “off” before making any input, output or network
connections, and also before manipulating the DIP-switches on the rear-panel.
· Make sure that the AC mains voltage is correct and matches the voltage
printed on the rear-panel of the amplifier (115 V or 230 V).
· Make sure that no signal is present at the input to the amplifier when
powering up. This could produce an unintentionally loud initial volume from
the speakers.
5.3. Signal flow and headroom
5.3.1. Signal flow blocks
All C Series amplifiers have the same signal flow and feature set. The only
difference is the amplifier’s maximum output current per channel.
The input stage of all C Series amplifiers has a high sensitivity to provide
ample system headroom. This in effect means that the input stage is almost
impossible to clip.
Overall amplifier input gain is adjusted using the input stage DIP-switches.
Please note that the gain setting is global, affecting all four channels.
Following the input stage, the dedicated level control on each channel allows
signal attenuation from 0 dB to minus infinity.
The CPL (Current Peak Limiter) section dynamically limits the input signal
based on three parameters: sensed current level, feedback from the output
stage, and sensed voltage clip from the VPL (and output amplifier voltage clip
if “Soft Clip” activated). This ensures that power output is maintained within
the design limits of the amplifier.
The adjustable VPL (Voltage Peak Limiter) sets the maximum output voltage and
therefore also the maximum output power. Eight (8) different voltage stages
are available using the DIP-switches on the rear-panel. See table in Appendix
section with VPL ratings at typical loads.
The sophisticated output section monitors faults and generates appropriate
warnings, which are displayed on the amplifier front-panel and transmitted
through the NomadLink network. These alerts allow the operator to
15 C SERIES Operation Manual rev 3.0.0
5. Operation and performance
adjust system settings and thereby avoid problems. In the rare event that
conditions are extraordinarily severe, the amplifier will shut down until the
fault or problem setting has been rectified or adjusted. These sensing
circuits are also employed to feed back voltage and current level information,
via a side chain, to the limiters. Sensing circuits also transmit local
amplifier module temperature and power supply temperature to the appropriate
protection mechanisms. Read the Protection, Faults and Warnings section for
further details.
5.3.2. Headroom, sensitivity and VPL / Gain settings
The input amplifier and limiter system is designed to accommodate extremes of
performance. Typically, exceeding maximum input by much as +10 dB will only
result in a 1% increase in distortion. The following schematics illustrate how
the adjusable VPL and Gain circuitry affect input sensitivity and output
power: The tables to the left of the drawing below show input sensitivity for
a C 68:4 with an 8 ohm load and 141 V peak (max.) and 42 V peak (min.)
respectively for the eight different gain stages between +23 dB and +44 dB.
The resulting output power is displayed in dBu, Vrms and Watts in the tables
to the far right. Complete input sensitivity tables for all VPL and Gain
settings for as applicable to C Series models can be found at
www.labgruppen.com. The headroom available through the input stage to the clip
limiter is shown by the dotted lines as +10 dB at 141 V peak and +20.4 dB at
42 V peak. These lines illustrate the additional signal level that can be
accepted at the input before any significant distortion will appear at the
input stage.
NOTE: If you use the level potentiometer in the signal chain to reduce the
level by an amount greater than the headroom relative to input sensitivity,
AND you drive the amplifier to clip level, you are in danger of clipping the
input stage before the current or voltage peak limiters are activated.
NOTE: When bridging two channels, you must add +6 dB to the input sensitivity
to achieve maximum output voltage due to the automatic -6 dB gain compensation
inserted by the amplifier.
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5. Operation and performance
5.4. Audio Input and Output connections, setup and features
5.4.1. Balanced / Unbalanced Input connection
Two electronically balanced Phoenix-type inputs are available. Follow the +,
and Ground labels when connecting the input signal.
If an unbalanced connection is desired this can be achieved by summing the
minus (“COLD”) and Ground terminals and using the + terminal as the “HOT”
signal. For the best possible performance, the summing of ground and minus
wires should be done at the source unit end of the cable (e.g. a CD player).
Four connectors are supplied for attaching cables to the inputs. The type of
connector used is: Phoenix Contacts, Part number MSTB 2,5/3-STZ-5,08.
17 C SERIES Operation Manual rev 3.0.0
5. Operation and performance
NOTE: When linking the same source signal to several input channels, be aware
that there is a limit to the number of channels an output source can “drive”.
A typical output source (e.g. a DSP crossover unit) can drive up to four
amplifier channels before external line-drivers might be required to buffer
the signal.
5.4.2. Output operation and connection
Screw-terminal connectors with + and poles are provided at each channel
output for connection of the speakers.
Make sure that the speaker cables are connected correctly and tightly, and
that accurate polarity is maintained to all speakers in the system. As the
amplifier outputs produce high voltage, do not connect or disconnect speaker
cables when the mains power is on. Also, attach the safety cover on the
speaker terminals for safe operation and to comply with electrical product
approvals.
5.4.3. Output bridge mode
It is possible to bridge channels in pairs of two (A+B and C+D for example).
When bridged, the input source must be connected to input A (A+B) or C (C+D)
respectively. Output speaker cables must be connected to the plus pole on
channel A or C and the minus pole on B or D. The main benefit of bridging the
output is a doubling of output voltage. Bridging can be used to turn the
amplifier into a three-channel amplifier with, for example, 2 x 1200 W and 1 x
2400 W at 4 ohms utilizing the C 48:4, or simply to achieve an impressive 200
Vrms supply per channel. Most power amplifier designs, when bridged,
automatically introduce a +6 dB input gain boost which can lead the user to
conclude that said amplifier delivers “more than double the power” when in
bridge mode. This is clearly not the case, as the gain boost artificially
enhances perceived power at the cost of headroom. The C Series amplifiers work
on globally set constant gain, and automatically compensate the input gain by
-6 dB. For example, if the amplifier is configured in a three-channel mode,
then the selected gain is maintained from input to output on all channels.
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5. Operation and performance
5.4.4. Amplifier Input Gain
All C Series amplifiers feature adjustable input gain. This versatility
enables the amplifier to accommodate a multitude of system configurations with
various input sources and speaker layouts. Amplifier gain is set globally for
all four channels. The range is +23 dB to +44 dB in 3 dB steps. Individual
channel fine level adjustment is available using the potentiometers on the
front panel. The unique adjustable input gain feature of the C Series makes it
easier to attain the optimum balance between headroom and signal-to-noise
ratio in the signal path. A weak signal at the input might require the gain to
be raised in order to achieve maximum output power with the lowest signal-to-
noise ratio. A “hot” input signal, however, would require a lowering of the
gain to avoid sending the amplifier into Voltage or Current clipping. See
Appendix to review the table containing Gain versus VPL setting implications
for input sensitivity and output power.
NOTE: Bridge mode operation automatically compensates by -6 dB, keeping all
channels at the same gain.
5.4.4.1. Channel gain/level (front-panel pots)
Individual channel gain (level) may be adjusted using the potentiometers
located on the front-panel behind the dust filter cover. Range is from 0 dB to
-infinity in 21 steps. The attenuation is logarithmic, with the 12 o’clock
position indicating -10 dB. Use your fingers or a screwdriver to adjust the
potentiometers.
NOTE: If the level control is used to attenuate to a lower level than the
headroom relative to input sensitivity AND the amplifier input is driven into
clip, there is a danger of clipping the input stage before the current or
voltage peak limiters are activated.
5.4.4.2. Amplifier sensitivity
Sensitivity is defined as how many volts (rms) or dBu (referred to 0.775 Vrms)
are required to achieve full (maximum) output power. As the output power
varies with the load impedance, 4 ohms is usually the common reference. Since
C Series amplifiers are capable of providing multiple maximum output power
levels through use of the VPL feature, many sensitivity calculations may be
required for a single amplifier. We recommend use of the DeviceControl
software to simplify this process. DeviceControl’s Device View page, used in
combination with the DIP-switch settings display, will automatically produce a
sensitivity calculation from the given data (VPL, Gain and load).
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5. Operation and performance
5.4.5. Output Voltage Peak Limiter (VPL)
The Voltage Peak Limiter (VPL) is a unique feature in C Series amplifiers. It
is used to select the maximum power available on each output channel. Four
levels can be set using the DIP-switches on the amplifier’s rear panel.
V peak
141 118 100 85 71 59 50 42
Vrms
100 84 70 60 50 42 35 30
The values for VPL are displayed as maximum Voltage Peak. To translate Voltage
Peak into Vrms, you must divide the Voltage Peak values by 1.41 (see table).
The VPL allows you to set the correct maximum output peak power for optimum
performance with the connected speakers. The correct setting depends on the
system type (low or high impedance) and the specific load connected to the
channel. Since each channel can be configured to deliver either very high
voltage peak power OR high current draw at low impedances, it is important to
set the VPL correctly.
To configure an individual output channel for a constant voltage system, you
simply adjust the DIP-switches to the desired voltage. However, when using an
output for a low-impedance system ( 4, 8 or 16 ohms), then you may need to
adjust the VPL to a lower setting to avoid either delivering excessively high
continuous power to the speaker or overheating of the output channel through
high current draw. For example, with a very “hot” continuous output signal,
the temperature could rise to a critical level and activate Temp warning or
even Temp Mute. Lowering the VPL setting usually will solve this situation.
If the Current Peak Limiter is active or indicates low impedance, lowering the
VPL setting can rectify this situation as well.
5.4.6. Constant voltage 70 V and 100 V systems setup and operation
When using C Series amplifiers to drive constant voltage (high-impedance)
speaker systems at 70 Vrms or 100 V peak, you can in most cases simply connect
the speakers to the amplifier output terminals, select the correct VPL
setting, and place the amplifier in service.
5.4.8. Output Current Peak Limiter (CPL)
The Current Peak Limiter (CPL) ensures that the amplifier will not be damaged
by trying to deliver current to the outputs exceeding the physical limitations
the transistors. The CPL keeps the amplifier within the Safe Operating Area.
The CPL is non-adjustable and has different limit values depending on model
type. The maximum output current values for the four C…X models are:
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5. Operation and performance
· C 88:4, 35.5 Arms per channel · C 68:4, 24.5 Arms per channel · C 48:4, 17.5
Arms per channel · C 28:4, 12 Arms per channel · C 16:4, 8.5 Arms per channel
CPL activity is indicated by illumination of an orange LED for each channel on
the front-panel. Warnings also are shown in the DeviceControl software’s GUI.
A steadily illuminated orange CPL LED indicates a short circuit situation (or
very low impedance). The output will mute for 6 seconds before measuring the
output impedance again. This will continue until the short circuit is fixed,
at which time the output will automatically un-mute. An input signal must be
present to allow detection of short circuit or low impedance conditions.
TIP: If the CPL LED is steadily illuminated orange while the output is muted
and the -4 dB signal LED is NOT on, then the amplifier output is detecting a
short circuit or low impedance condition. The problem can be solved by
checking input and output cables and examining the state of the loudspeaker
load. If there is no short circuit present, then the condition may be
rectified by lowering the VPL or input levels.
If the CPL indicator is lit continuously, then the amplifier is delivering
excessive current and is being forced into a current limiting state (output
muted).
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5. Operation and performance
5.5. GPIO connection and operation
5.5.1. Introduction
The C Series amplifiers incorporate a sophisticated and comprehensive set of
protection features. Faults and warnings are indicated on the front-panel and
reported via the NomadLink network for indication on the DeviceControl GUI.
5.5.2. Safe Operating Area Detector (SOAD)
The Safe Operating Area Detector (SOAD) compares output voltage against output
current to ensure that the output transistors are working inside their safe
operating area.
The SOAD provides fault monitoring and input to the Current Peak Limiter
(CPL). The SOAD has no dedicated indicator, and its operation is revealed only
in conjunction with features such as the CPL.
5.5.3. Very High Frequency protection
All C Series amplifiers include protection circuits that detect continuous
Very High Frequency (VHF) content in the input signals. The detection begins
at approximately 10 kHz and moves upwards to include ultrasonic signals. If
VHF signals are detected, the output will mute for 6 seconds before re-
measuring. Once no continuing VHF signal is detected, the output un-mutes and
returns to normal operation.
This feature recognizes that continuous full-scale VHF signals do not appear
in “natural” sources such as music. Any such signals can therefore be
considered as a fault when present. VHF protection is essential for avoiding
damage to high frequency drivers.
The VHF protection operational area is dependent on output power level and
frequency. The illustration below shows a decreasing threshold on the output
power level, starting at approximately 10 kHz and rising with a -6 dB slope.
This defines the VHF protection area. When continuous output power above the
threshold line is detected the VHF protection becomes active.
Output power
VHF protection operation area – 6 dB slope
Max. Peak output power
Max. Continous output power
20 Hz Slow
10 kHz
20 kHz
Attack time VHF protection
30 kHz
Fast 20 Hz
10 kHz
20 kHz
30 kHz
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5. Operation and performance
The Attack time for the VHF protection is increasingly shorter at higher
frequencies. For example, an ultrasonic continuous signal will cause the
outputs to mute rapidly, where it will take several milliseconds for a 10 kHz
continuous signal to trigger the output mute. This is shown in the
illustration above. The VHF protection is NOT a limiter and does not alter the
amplifier’s frequency response. It is implemented solely to detect continuous
VHF content. The amplifier will always pass VHF peaks at full power, with no
effect on musical “transients”. The VHF protection is indicated by a yellow
LED on the amplifier front-panel, with output muting for six seconds when in
action. It is reported as a fault via the NomadLink network on the
DeviceControl GUI.
TIP: If you bench test the amplifier using a continuous, full scale sine-wave
input above 10 kHz, the VHF protection will activate and prevent measurement
of full peak output power. (Output will be muted long before maximum output
power is attained.) To measure the true peak output power, use a burst signal.
5.5.4. DC protection
DC protection is implemented on each output to prevent damage to connected
loudspeakers. DC present at the output will trigger muting and illuminate the
fault LED indicator. Any DC present at the output indicates a hardware
malfunction that requires servicing of the amplifier.
5.5.5. High-impedance warning (open load)
A high-impedance (open load) condition is indicated when an input signal above
approximately -29 dB is detected and no functioning loudspeakers are connected
to the amplifier. The fault in indicated by a red Sig/Hi-imp LED. The
indicator is green when a valid load is present under the same input signal
conditions.
NOTE: Since the high-impedance detection initially triggers only when the
input signal rises above -29 dB, it might cause the indicator to first turn
green, and then red, even in situations where no speaker is connected.
5.5.6. Low-impedance protection (short circuit)
A low-impedance or short-circuit fault is detected when current draw is high
(Current Peak Limiter active) and when, simultaneously, output signal is low
(-4 dB LED does not illuminate). When this occurs, the amplifier protects the
output stage from damage by muting the output signal and bypassing the
circuits. Indication of this fault is a constant orange illumination of the
Current Peak Limiter (CPL) LED on the front-panel. The protection will
sequence
23 C SERIES Operation Manual rev 3.0.0
5. Operation and performance
at six second intervals to re-measure conditions. If the low-impedance fault
is no longer detected, the amplifier will un-mute.
NOTE: If the CPL turns constant orange, the output is muted, and the -4 dB
signal LED is ON, then the amplifier has gone into maximum current protection.
This situation is caused by an excessive input signal and is not due to a
short circuit. Turn down the input signal to avoid or remedy this situation.
5.5.7. Temperature protection
Thermal measurement points are provided on each output channel as well as on
the power supply. If these sensors detect temperatures above the specified
maximums, a high temperature warning will be indicated by a flashing Temp LED
on the front panel. The warning also will be transmitted to the Device Control
GUI via the NomadLink network. As the amplifier approaches a thermal
protection threshold, the warning LED sequence will start with short “ontime”
bursts. If the amplifier continues to overheat and approaches the temperature
limit, the flashing sequence will be defined by longer and longer on-time
bursts until the protection mode is activated. If the temperature becomes too
high to continue safe operation, the overheated output channel(s) will be
muted until the temperature returns to an acceptable level. Fully active
temperature protection (with muting) is indicated by a constantly illuminated
Temp LED. It will also be indicated as a fault via the NomadLink network on
the DeviceControl GUI. Temperature measurements will continue at six second
intervals. The output will un-mute when the channel or power supply returns to
a safe operating temperature.
5.5.8. Power Average Limiter (PAL)
The Power Average Limiter (PAL) controls the current-drawing relationship
between the power supply and the mains inlet. PAL limits the maximum average
power consumption according to the power supply capabilities, ensuring that
the PSU will not overload. In addition, in the larger models that potentially
could pull more current from the mains than the mains fuses are specified to
handle (more than 16 A), PAL limits the amplifier’s maximum current draw to
prevent blowing the mains fuse.
5.5.9. Soft-Start
High powered amplifiers with inadequate inrush limiting can pull considerable
current from the mains at turnon. This can result in fast acting mains
breakers tripping. Such is not the case with C Series amplifiers in most
circumstances.. The C Series amplifiers have very low inrush power as the
capacitors are charged slowly, and in a controlled manner, ensuring that
breakers will not trip.
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5. Operation and performance
Several amplifiers will, under normal conditions, be able to be powered up
simultaneously. If you do experience problems powering up multiple amplifiers
simultaneously (normally experienced only in very large installations), use
the NomadLink network and the NLB60E to establish a power sequence with pre-
set delays before the start-up of each subsequent amplifier.
5.6. Front-panel monitoring
5.6.1. Level indicators
Four signal/level/clip LEDs per channel are contained on the C Series front
panels
· Orange CPL (Current Peak Limiter) flashing indicates signal exceeds the
limits of the output devices and limiting is in effect.
· Red VPL/CLIP indicates that the signal has exceeded maximum output voltage.
(Maximum voltage is determined by rear-panel VPL settings.)
· Green – 4 dB indicates output signal has reached this level. · Green – 10 dB
indicates output signal has reached this level. · Signal / Hi-Imp (Green/red)
indicates an output signal above -44 dB. If it turns RED, this indicates that
a
high-impedance (“open” connection) has been detected at the output. This can
be a fault such as a disconnected cable or malfunctioning loudspeaker driver.
However, it could indicate acceptable high impedance, such as a sub-bass
enclosure with high impedance at a certain frequency. When the -10 dB signal
LED is on AND the Hi-Imp LED turns red then the amplifier has detected an open
load (no speaker is connected). For more detailed signal level indications use
the DeviceControl software application.
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5. Operation and performance
5.6.2. Level adjust
Level adjust potentiometers (one per channel) are located behind the removable
dust-filter cover on the amplifier’s front-panel. It is not possible to adjust
the level settings with the cover in place.
Step
1 (Min) 2 3 4 5 6 7 8 9 10 11
Attenuation
-Inf. dB -Inf. dB -50 dB -40 dB -35 dB -21.5 dB -21.5 dB -14.7 dB -12.9 dB -11.4 dB -10.0 dB
Step
12 13 14 15 16 17 18 19 20 21 (Max)
Attenuation
-8.7 dB -7.4 dB -6.0 dB -4.5 dB -2.7 dB -0.6 dB -0.3 dB -0.1 dB
0 dB 0 dB
Level adjust potentiometers (one per channel) are located behind the removable
dust-filter cover on the amplifier’s front-panel. It is not possible to adjust
the level settings with the cover in place.
The potentiometer’s operational range is 0 dB to -infinity in 31 steps.
Attenuation is logarithmic, with 12 o’clock position being -10 dB. See table
to the above with increments.
It is not possible to adjust the individual channel attenuation from the
NomadLink network or elsewhere on the amplifier.
Use fingers or a screwdriver to adjust the potentiometers.
5.6.3. Mute indication
Individual channel Mute is indicated by illumination of the two yellow LEDs at
the top of the channel’s LED bargraph. If both LEDs are illuminated and all
other indications are normal, then the channel has been muted by a command
from the NLB 60E front-panel or the DeviceControl application. Otherwise, a
Mute could indicate a fault condition.
5.6.4. Performance, Warning and Fault indicators
· Power on/off (green) indicates that mains power is switched on. · NomadLink
(blue) indicates that the network is connected. The NomadLink LED will light
up even before the
mains power is connected and switched on as it takes phantom power from the
NomadLink network cable. · Bridge mode (yellow) indicates if two channels are
bridged using the DIP-switch on the rear panel.
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5. Operation and performance
· CPL, Current Peak Limiter (orange), when flashing indicates the maximum
possible current draw has been reached.
· CPL, Current Peak Limiter (orange), when constant indicates excessive
current draw caused by a short circuit on the output or very low operational
impedance. When detected, the output will mute for six seconds before re-
measuring the output impedance. This will continue until the short circuit is
removed. CPL remains constant orange in a fault condition only when an input
signal is present.
· Temperature (yellow) warning is indicated by a flashing LED. If the
amplifier goes into thermal protect (output muted) the LED illuminates
constant yellow.
· VHF, Very High Frequency protection (yellow), indicates that potentially
harmful continuous high frequencies have been detected on the input signal.
The output is muted.
· PAL, Power Average Limiter (red), indicates that the amplifier is limiting
because the power supply and/or the mains-inlet fuse has reached maximum
capability.
· Hardware fault is indicated when both the CPL and VHF indicators light up
simultaneously. The amplifier requires servicing before being placed back in
operation.
5.7. NomadLink network and DeviceControl software
5.7.1. NomadLink network in the amplifiers
All C Series amplifiers are equipped with the proprietary NomadLink network
interface. This includes two RJ45 connections in standard housings: one IN and
one OUT. Use standard straight Cat-5 Ethernet cables with RJ45 connectors to
connect the amplifier to the NLB 60E NomadLink Bridge and Network Controller
or to daisy-chain multiple amplifiers.
NOTE: It is very important that two IN or two OUT ports are NEVER connected to
each other. This will cause the NomadLink communication and DeviceControl to
exhibit erratic behavior and display inaccurate data. However, this situation
will not damage the amplifier circuitry.
Up to 60 amplifiers can be connected to one NLB 60E in a daisy-chain or closed
loop. When the NLB 60E is powered up, the NomadLink network receives phantom
power. This causes the blue NomadLink LED on the amplifier front panel and the
NomadLink LED on the rear panel to light up. NomadLink is active even when the
amplifier has mains power disconnected or is not yet powered up. The amplifier
does not have a stand-by power supply for the network. The network is solely
powered from the NLB 60E. Should an amplifier fail or be inadvertently
disconnected from the mains, network integrity is fully maintained and all
amplifiers remain visible on the system.
27 C SERIES Operation Manual rev 3.0.0
5. Operation and performance
5.7.2. Connection and setup
The NomadLink network requires use of an NLB 60E NomadLink Bridge & Network
Controller. The NomadLink network is established by connecting the NLB 60E OUT
port to the first amplifier’s IN port. Then a daisy-chain is established by
connecting the first amplifier’s OUT port to the next amplifier’s IN port, and
so on. If a closed loop network is desired for improved redundancy (highly
recommended), the last amplifier’s OUT port must be connected to the NLB 60E’s
IN port. For all connections, straight Cat-5 RJ45-equipped Ethernet cables
should be used.
TIP: Optimal NomadLink performance can only be assured when using Cat-5
cables. However, as NomadLink is only using two wires + ground for
communication and phantom power it is possible to create converters from RJ45
to, for example, XLR connectors using 2-wire shielded cable. The NomadLink
network can then be operated using a standard tie-line in a multicore signal
distribution system. See the drawing below for an example of how to create a
converter.
NOTE: If any cable format or connection other than Cat-5 (or better) and RJ45
is utilized, network performance may be compromised. In this event LAB GRUPPEN
cannot guarantee that the NomadLink network will be fully operational.
5.7.3. NomadLink network cable lengths
The connection between the NLB 60E and your PC is a standard Ethernet network
running the TCP/IP protocol. Cable distances between NLB 60E and your PC
follow standard rules for Ethernet systems. In situations where the amplifiers
and the NLB 60E will be positioned in different locations at some distance
from each other, or where groups of amplifiers within a single subnet with up
to 60 units will be installed with a distance in between, these general rules
applying to Ethernet cabling limitations may be considered. · Rule 1: The
maximum cable length in between any two devices may not exceed 300 meters /
980 feet. · Rule 2: In a non-closed-loop daisy-chained subnet the total
maximum cable length is 400 meters / 1300 feet. · Rule 3: In a closed-loop
subnet the total maximum cable length is 700 meters / 2300 feet.
28 C SERIES Operation Manual rev 3.0.0
5. Operation and performance
5.7.4. Ethernet network cable lengths
The connection between the NLB 60E and your PC is a standard Ethernet network
running the TCP/IP protocol. Cable distances between NLB 60E and your PC
follow standard rules for Ethernet systems. Contact your an IT expert or an
authoritative source for more details. Below are typical examples of NomadLink
network setups:
NomadLink daisy chain configuration NomadLink closed loop configuration
NomadLink closed loop daisy chain configuration
NomadLink dual daisy chain closed loop configuration
29 C SERIES Operation Manual rev 3.0.0
5. Operation and performance
5.7.5. DeviceControl software
DeviceControl is LAB GRUPPEN’s proprietary software application for monitoring
and controlling networked FP+ Series and other LAB GRUPPEN NomadLink-ready
power amplifier. DeviceControl runs on a Windows PC, which connects via
Ethernet to the NLB 60E NomadLink Bridge & Network Controller. DeviceControl
provides comprehensive monitoring of amplifier status as well as control of
amplifier power on/off and individual channel mute and solo functions. Please
review the DeviceControl Operation Manual for more detailed information.
5.7.6. Third Party Control and Monitoring Capabilities
The NLB 60E NomadLink Bridge & Network Controller can be integrated with third
party control systems via its Ethernet connection. All amplifier control
functions, fault and warning notifications that would otherwise be displayed
via the DeviceControl software can be replicated in a third party control GUI.
Please note that NLB 60E Firmware Ver 2.1.0 (or later) must be used in order
to utilize the third party control and monitoring capabilities of the
NomadLink network. Both the firmware package and the control protocol
documentation, which describes the functionality and programming requirements
for third party integration, can be found under the Software & Firmware
section of our website at:
http://labgruppen.com/index.php/support/software_firmware/
30 C SERIES Operation Manual rev 3.0.0
6. Appendix
6. Appendix
6.1. Maintenance
During normal operation your C Series amplifier will provide trouble-free
service. The only user maintenance required is to periodically vacuum clean
the foam dust filters behind the front grille.
In some extreme cases it may be necessary for authorized service personnel to
clean the inside of the amplifier. These conditions usually occur after
prolonged use in extreme environments such as those using “cracked oil” smoke
machines. If you are using your amplifier in a heavy duty application, it is
recommended to have your amplifier serviced every three years purely as a
preventative action.
6.2. FAQ
Following are common questions asked about LAB GRUPPEN C Series power
amplifiers together with helpful answers.
Q: What is the input sensitivity of the amplifiers? A: Input sensitivity is
calculated from the amplifier gain, maximum output voltage and load. As gain
and output voltage are adjustable in C Series amplifiers, you need to look
this information up in a table found in the Appendix section of this manual.
Input sensitivity also is automatically calculated in the DeviceControl
software application.
Q: What are the maximum cable lengths allowed when using the NomadLink
network? A: NomadLink uses a daisy-chain topology to connect amplifiers and an
NLB 60E in a network. Standard RJ45equipped Cat-5 cables are used throughout.
The daisy chain may be made into a closed-loop by connecting a return cable to
the NLB 60E from the last amplifier.
General rules of cable lengths: · The maximum cable length in between any two
devices may not exceed 300 meters / 980 feet. · In a non-closed-loop daisy-
chained subnet the maximum cable length is 400 meters / 1300 feet. · In a
closed-loop subnet the maximum cable length is 700 meters / 2300 feet.
Exceeding these limits may result in lost contact with the devices, or loss of
phantom powering due to cable resistance.
Q: How long can cable-runs be on the Ethernet network connecting the NLB 60E
to the PC? A: On the Ethernet side, normal Ethernet cable limits apply. This
is typically a maximum of 80 meters / 300 feet between each device. Follow
standard installation procedures for Ethernet. Distances beyond 100 meters may
require use of a repeater, a format converter, or optical cables.
Q: Why is the NomadLink network a closed-loop topology? A: Technically
speaking, the closed loop is optional. The purpose of closing the loop is
primarily to provide a secondary path to the amplifiers. If cables are broken
or disconnected in either direction, all amplifiers still may be addressed by
the network.
31 C SERIES Operation Manual rev 3.0.0
6. Appendix
Q: How can I be sure that no protection circuits or safety functions interfere
with the output signal? A: If no Clip or Warning LEDs on the front panel light
up, you can be fully confident that the rated maximum output power in the full
frequency range is available for your speakers. No limiting or gain-reduction
takes place without a warning or fault indication.
6.3. Additional documentation
In case you didn’t find what you were looking for in this Operation Manual,
check out the website at www.labgruppen.com, where you can find a multitude of
additional documentation for C Series.
32 C SERIES Operation Manual rev 3.0.0
6. Appendix
6.4. Current Draw and Thermal Dissipation Specifications
The following tables contain information on measured current consumption as
well as calculated heat dissipation during normal operation (1/8 rated power);
and during extreme heavy duty operation (1/4 rated power).
Level
Load
C 88:4
Rated power
Line Current *2)
Watt *1)
Thermal Dissipation
115 VAC
230 VAC
In
Out
Dissipated BTU/hr
kCal/hr
Standby with remote power off via NomadLink Powered on, idling.
Pink noise (1/8 rated power)
8 / Ch. 16 / Bridged 4 / Ch. 8 / Bridged 2 / Ch. 4) 4 / Bridged 4) 100 V / Ch. 200 V / Bridged
1250 x 4 2500 x 2 2100 x 4 4200 x 2 2200 x 4 4400 x 2 2000 x 4
N/R
Amp (I)
17.6
8.8
0 139
1177
0 0
Watt
625
0 139
552
0
0
475
120
1884
475
27
13.5
1914
1050
864
2949
743
33.6
16.8
2221
1150
1071
3655
921
26.2
13.1
1838
1000
838
2860
721
Pink noise (max power) *3)
8 / Ch. 16 / Bridged 4 / Ch. 8 / Bridged 2 / Ch. 4 / Bridged 100 V / Ch. 200 V / Bridged
1250 x 4 2500 x 2 2100 x 4 4200 x 2 2300 x 4 4600 x 2 2000 x 4 4000 x 2
30.0 30.0 30.0 30.0
16.0
2006/2140 1145/1221 860/918 2935/3133 739/789
16.0
2127/2268 1230/1312 896/956 3058/3263 770/822
16.0
1983/2115 1016/1084 966/1031 3297/3519 831/886
16.0
5992/2236 3467/1294 883/942 3014/3216 759/810
Mains connector, 230 V CE version Mains connector, 115 V ETL version
16 A, CEE7 30A Twist Lock
1) The amplifier’s PSU operates as a non-resistive load, so the calculation “Volts x Amps = Watts” would not be correct. Instead, measured and specified here is what is known as the “Active Power” in the amplifier providing useful, real-world values of power consumption and heat dissipation.
2) Current draw figures measured at 230 V. 115 V figures are 230 V figures multiplied by two.
3) Figures measured at maximum sustainable power without tripping the mains fuse. Listed separately for 30 A/115 V and 16 A/230 V operation. Note that the max. power condition is very extreme and will not occur during normal operation. Also note that the mains breaker will not be tripped even if operation is momentarily in excess of max. ratings.
4) Italics used for conditions that, if sustained over long time periods, may trigger the mains breaker. Therefore these measurements should not be used when calculating cooling requirements as they cannot be sustained by the mains breaker over time.
·
·
·
33 C SERIES Operation Manual rev 3.0.0
6. Appendix
Level
Load
C 68:4
Rated power
Line Current *2)
115 VAC 230 VAC
In
Watt *1)
Out
Dissipated
Thermal Dissipation
BTU/hr
kCal/hr
Standby with remote power off via NomadLink Powered on, idling.
Pink noise (1/8 8 / Ch. rated power) 16 / Bridged
4 / Ch. 8 / Bridged 2 / Ch. 4 / Bridged 100 V / Ch.
200 V / Bridged
1200 x 4 2400 x 2 1700 x 4 3400 x 2 1200 x 4 2400 x 2 1600 x 4 3200 x 2
Amp (I)
16.0
8.0
0 133
1123
0 0
Watt
600
0 133
523
0
0
454
114
1784
450
22.4
11.2
1578
850
728
2484
626
21.2
10.6
1378
600
778
2655
669
21.0
10.5
1463
800
663
2262
570
Pink noise (1/4 rated power) *3)
8 / Ch. 16 / Bridged 4 / Ch.
8 / Bridged
4 / Ch.
8 / Bridged
100 V / Ch.
200 V / Bridged
1200 x 4 2400 x 2 1700 x 4 3400 x 2 1200 x 4 2400 x 2 1600 x 4 3200 x 2
32.6
16.3
2429
1600
829
2829
713
38.8
19.4
2697
1700
997
3402
857
35.2
17.6
2296
1200
1096
3740
942
35.4
17.7
2605
1600
1005
3429
864
Mains connector, 230 V CE version Mains connector, 115 V ETL version
16 A, CEE7 20 A / 5-20P
1) The amplifier’s PSU operates as a non-resistive load, so the calculation “Volts x Amps = Watts” would not be correct. Instead, measured and specified here is what is known as the “Active Power” in the amplifier providing useful, real-world values of power consumption and heat dissipation.
2) Current draw figures measured at 230 V. 115 V figures are 230 V figures multiplied by two.
*3) Figures measured at maximum power before amplifier protection and limiter features are engaged. Typically this is between 1/4 and 1/3 of rated power. Note that the max. power condition is very extreme and will not occur during normal operation. Also note that the mains breaker will not be tripped even if operation is in excess of max. ratings.
·
·
·
34 C SERIES Operation Manual rev 3.0.0
6. Appendix
Level
Load
C 48:4
Rated power
Line Current *2)
115 VAC 230 VAC
In
Watt *1)
Out
Dissipated
Thermal Dissipation
BTU/hr
kCal/hr
Standby with remote power off via NomadLink Powered on, idling.
Pink noise (1/8 8 / Ch. rated power) 16 / Bridged
4 / Ch. 8 / Bridged 2 / Ch. 4 / Bridged 100 V / Ch.
200 V / Bridged
1000 x 4 2000 x 2 1200 x 4 2400 x 2
600 x 4 1200 x 2 900 x 4 1800 x 2
Amp (I)
0
0
0
0
0
123
0
123
420
106
Watt
13,8
6,9
945
500
445
1518
383
17,4
8,7
1171
600
571
1948
491
12,4
6,2
769
300
469
1600
403
13,2
6,6
840
450
390
1331
335
Pink noise (1/4 rated power) *3)
8 / Ch. 16 / Bridged 4 / Ch.
8 / Bridged
4 / Ch.
8 / Bridged
100 V / Ch.
200 V / Bridged
1000 x 4 2000 x 2 1200 x 4 2400 x 2
600 x 4 1200 x 2 900 x 4 1800 x 2
28,2
14,1
2116
1333
783
2670
673
30,6
15,3
2168
1200
968
3303
832
21,6
10,8
1368
600
768
2620
660
26,4
13,2
1827
1200
627
2139
539
Mains connector, 230 V CE version Mains connector, 115 V ETL version
16 A, CEE7 20 A / 5-20P
1) The amplifier’s PSU operates as a non-resistive load, so the calculation “Volts x Amps = Watts” would not be correct. Instead, measured and specified here is what is known as the “Active Power” in the amplifier providing useful, real-world values of power consumption and heat dissipation.
2) Current draw figures measured at 230 V. 115 V figures are 230 V figures multiplied by two.
*3) Figures measured at maximum power before amplifier protection and limiter features are engaged. Typically this is between 1/4 and 1/3 of rated power. Note that the max. power condition is very extreme and will not occur during normal operation. Also note that the mains breaker will not be tripped even if operation is in excess of max. ratings.
·
·
·
35 C SERIES Operation Manual rev 3.0.0
6. Appendix
Level
Load
C 28:4
Rated power
Line Current *2)
115 VAC 230 VAC
In
Watt *1)
Out
Dissipated
Thermal Dissipation
BTU/hr
kCal/hr
Standby with remote power off via NomadLink Powered on, idling.
Pink noise (1/8 8 / Ch. rated power) 16 / Bridged
4 / Ch. 8 / Bridged 2 / Ch. 4 / Bridged 100 V / Ch.
200 V / Bridged
700 x 4 1400 x 2
700 x 4 1400 x 2
300 x 4 600 x 2 700 x 4 1400 x 2
Amp (I)
0
0
0
0
0
123
0
123
420
106
Watt
11.6
5.8
727
350
377
1286
324
13.0
6.5
775
350
425
1450
365
9.4
4.7
529
150
379
1293
326
10.4
5.2
663
350
313
1068
269
Pink noise (1/4 rated power) *3)
8 / Ch. 16 / Bridged 4 / Ch.
8 / Bridged
4 / Ch.
8 / Bridged
100 V / Ch.
200 V / Bridged
700 x 4 1400 x 2
700 x 4 1400 x 2
300 x 4 600 x 2 700 x 4 1400 x 2
24.0
12.0
1589
933
20.8
10.4
1359
700
14.0
7.0
843
300
21.4
10.7
1458
933
656
2237
564
659
2249
567
543
1853
467
525
1790
451
Mains connector, 230 V CE version Mains connector, 115 V ETL version
16 A, CEE7 20 A / 5-20P
1) The amplifier’s PSU operates as a non-resistive load, so the calculation “Volts x Amps = Watts” would not be correct. Instead, measured and specified here is what is known as the “Active Power” in the amplifier providing useful, real-world values of power consumption and heat dissipation.
2) Current draw figures measured at 230 V. 115 V figures are 230 V figures multiplied by two.
*3) Figures measured at maximum power before amplifier protection and limiter features are engaged. Typically this is between 1/4 and 1/3 of rated power. Note that the max. power condition is very extreme and will not occur during normal operation. Also note that the mains breaker will not be tripped even if operation is in excess of max. ratings.
·
·
·
36 C SERIES Operation Manual rev 3.0.0
6. Appendix
Level
Load
C 16:4
Rated power
Line Current *2)
115 VAC 230 VAC
In
Watt *1)
Out
Dissipated
Thermal Dissipation
BTU/hr
kCal/hr
Standby with remote power off via NomadLink Powered on, idling.
Pink noise (1/8 8 / Ch. rated power) 16 / Bridged
4 / Ch. 8 / Bridged 2 / Ch. 4 / Bridged 100V / Ch.
200V / Bridged
400 x 4 800 x 2 300 x 4 600 x 2 n.r. n.r. 400 x 4 800 x 2
Amp (I)
0
0
0
0
0
129
0
129
440
111
Watt
8.6
4.3
526
200
326
1112
280
8.2
4.1
485
150
335
1143
288
7.6
3.8
463
200
263
897
226
Pink noise (1/4 rated power) *3)
8 / Ch. 16 / Bridged 4 / Ch.
8 / Bridged
2 / Ch.
4 / Bridged
100 V / Ch.
200 V / Bridged
400 x 4 800 x 2 300 x 4 600 x 2 n.r. n.r. 400 x 4 800 x 2
16.2 15.2
8.1
1046
533
7.6
953
400
14.4
7.2
944
533
513
1749
441
553
1887
475
411
1401
353
Mains connector, 230 V CE version Mains connector, 115 V ETL version
16 A, CEE7 15 A / 5-15P
1) The amplifier’s PSU operates as a non-resistive load, so the calculation “Volts x Amps = Watts” would not be correct. Instead, measured and specified here is what is known as the “Active Power” in the amplifier providing useful, real-world values of power consumption and heat dissipation.
2) Current draw figures measured at 230 V. 115 V figures are 230 V figures multiplied by two.
*3) Figures measured at maximum power before amplifier protection and limiter features are engaged. Typically this is between 1/4 and 1/3 of rated power. Note that the max. power condition is very extreme and will not occur during normal operation. Also note that the mains breaker will not be tripped even if operation is in excess of max. ratings.
·
·
·
37 C SERIES Operation Manual rev 3.0.0
7. Technical Specifications
7. Technical Specifications
Model Number of channels Peak total output all channels driven Peak output
voltage per channel Max. output current per channel
Max Output Power 16 ohms per ch. (all ch.’s driven) 8 ohms per ch. (all ch.’s
driven) 4 ohms per ch. (all ch.’s driven) 2 ohms per ch. (all ch.’s driven)
Hi-Z per ch. (all ch.’s driven): 70 Vrms / 100 V peak Hi-Z per ch. (all ch.’s
driven): 100 Vrms / 141 V peak
16 ohms Bridged per ch.1) 8 ohms Bridged per ch.1) 4 ohms Bridged per ch.1) 2
ohms Bridged per ch.1) Hi-Z Bridged per ch.1): 140 Vrms / 200 V peak
C 88:4 4 8800 W 141 V 35.5 Arms
C 68:4 4 6800 W 141 V 24.5 Arms
C 48:4 4 4800 W 141 V 17.5 Arms
C 28:4 4 2800 W 141 V 12 Arms
C 16:4 4 1600 W 141 V 8.5 Arms
C 20:8X 8 2000 W 100 V 8 Arms
650 W 1250 W 2100 W 2200 W 2200 W 1700 W
2500 W 4200 W 4400 W n.r 4) 4400 W
650 W 1200 W 1700 W 1200 W 1600 W 1200 W
2400 W 3400 W 2400 W n.r 4) 3200 W
625 W 1000 W 1200 W 600 W 1100 W 900 W
2000 W 2400 W 1200 W n.r 4) 1800 W
600 W 700 W 700 W 300 W 700 W 700 W
1400 W 1200 W 600 W n.r 4) 1400 W
400 W 400 W 300 W 140 W 400 W 400 W
800 W 600 W n.r 4) n.r 4) 800 W
250 W 250 W 250 W 125 W 250 W n.a.
500 W 500 W 250 W n.r 4) 500 W
C 10:8X 8 1000 W 100 V 5.6 Arms
125 W 125 W 125 W 60 W 125 W n.a.
250 W 250 W 125 W n.r 4) 250 W
C 10:4X 4 1000 W 100 V 8 Arms
250 W 250 W 250 W 125 W 250 W n.a.
500 W 500 W 250 W n.r 4) 500 W
C 5:4X 4 500 W 100 V 5.6 Arms
125 W 125 W 125 W 60 W 125 W n.a.
250 W 250 W 125 W n.r 4) 250 W
Performance with Gain: THD 20 Hz – 20 kHz for 1 W THD at 1 kHz and 1 dB below
clipping Signal To Noise Ratio Channel separation (Crosstalk) at 1 kHz
Frequency response (1 W into 8 ohms) +0/-3 dB Input impedance Common Mode
Rejection (CMR) Output impedance @ 100 Hz
Voltage Peak Limiter (VPL), max. peak output VPL, selectable per ch. 3) VPL,
when bridged 1) 3) Voltage Peak Limiter mode (per ch.)
35 dB and VPL: 100 V / C 88:4: 35 dB and VPL: 141 V <0.1% <0.05% >112 dBA >70
dB 6.8 Hz – 34 kHz 20 kOhm >50 dB, 20 Hz – 20 kHz 30 mOhm
141, 118, 100, 85, 71, 59, 50, 42 V 282, 236, 200, 170, 142, 118, 100, 84 V
Hard / Soft
32 dB and VPL: 100 V <0.1% <0.05% >112 dBA >70 dB 6.8 Hz – 34 kHz 20 kOhm >50
dB, 20 Hz – 20 kHz 48 mOhm
100, 63, 45, 32 V 200, 126, 90, 64 V Hard / Soft
Gain and Level Amplifier gain selectable (all channels) 1) rear-panel
switches Default gain
Level adjustment (per ch.)
23, 26, 29, 32, 35, 38, 41, 44 dB
35 dB Front-panel potentiometer, 21 position detented from -inf to 0 dB,
hidden behind security panel/dust filter grille
29, 32, 35, 38 dB
32 dB Front-panel potentiometer, 21 position detented from -inf to 0 dB,
hidden behind security panel/dust filter grille
Connectors and switches Input connectors (per ch.) Output connectors (per ch.) Output bridge mode High pass filter NomadLink network Intelligent fans (on/off) Power on/off and Remote enable on/off Cooling General Purpose Outputs (GPO) General Purpose Inputs (GPI)
3-pin Phoenix, electronically balanced Barrier strip 2-pole screw terminals A+B and/or C+D, inputs A and C are input source N/A On board, 2 x RJ45 connectors IN and OUT Yes, depending on presence of output signal Individual switches on front panel Two fans, front-to-rear airflow, temperature controlled speed N/A N/A
3-pin Phoenix, electronically balanced Barrier strip 2-pole screw terminals A+B, C+D, E+F, G+H, inputs A, C, E, G are signal source Fixed at 35 Hz, switchable per channel On board, 2 x RJ45 connectors, IN and OUT Yes, depending on presence of output signal Individual switches on front panel Two fans, front-to-rear airflow, temperature controlled speed Contact Closure types, 2-pole Phoenix Contact Closure types, 2-pole Phoenix
Front-panel indicators Common
Per channel
NomadLink Network; Power Average Limiter (PAL)2); Power on Signal present / High-impedance; -10 dB and -4 dB output signal;Voltage Peak Limiter (VPL); Current Peak Limiter (CPL): Very High Frequency (VHF); High temperature; Fault; Mute
NomadLink Network; Power Average Limiter (PAL)2); Power on Signal present / High-impedance; Voltage Peak Limiter (VPL); Current Peak Limiter (CPL): Very High Frequency (VHF); High temperature; Fault; Mute
Power Operating voltage, 230 V / 115 V nominal Minimum power-up voltage, 230 V
/ 115 V Power Average Limiter (PAL) 2) Power Factor Correction (PFC) Soft-
start / Inrush Current Draw Mains connector 5)
Dimensions Weight Finish
Approvals
130-265 V / 65 -135 V 6) 171 V / 85 V Yes No Yes / max. 5 A 230 V CE: 16 A, CEE7; 115 V ETL: 20 A / NEMA 5-20P; C16:4: 15A/NEMA 5-15P
Universal power supply 65-265 V 80 V Yes Yes Yes / max. 5 A IEC Inlet
W: 483 mm (19″), H: 88 mm (2 U), D: 343 mm (13.5″) 12 kg (26.4 lbs.) Black painted steel chassis with gray painted steel front
W: 483 mm (19″), H: 88 mm (2 U), D: 343 mm (13.5″) 8.5 kg (18.75 lbs.) Black painted steel chassis with gray painted steel front
CE, ANSI/UL 60065 (ETL), CSA C22.2 NO. 60065, FCC
CE, ANSI/UL 60065 (ETL), CSA C22.2 NO. 60065, FCC
Note 1): Automatic -6 dB gain compensation when bridging channels. Ch.’s A+B
and/or C+D, E+F, G+H, can be bridged individually. Note 2): PAL can reduce the
maximum output power to keep the power supply operating safely, and/or to
prevent excessive current draw tripping the mains breaker. Refer to Operation
Manual. Note 3): For sine waves, peak voltage output values translate to Vrms
with the formula V/1.41 = Vrms. E.g. 100 V peak equals app. 70 V peak. Hence,
outputs can be set for high-impedance loads without
requiring a transformer. Note 4): Regarding n.r. (not recommended) notes: The
amplifier will be fully operational in bridge-mode into 2 ohm and high
impedance (Hi-Z) loads, but due to physical constraints in the construction,
the max.
output power will not be significanty higher than running individual channels
and therefore this mode of operation is not recommended. Note 5): C 88:4 mains
connector: 30 A Twist lock. Note 6): Separate 230 V or 115 V versions
available. Not selectable on the amplifier.
All specifications are subject to change without notice.
38 C SERIES Operation Manual rev 3.0.0
8. Warranty and Support
8. Warranty and Support
8.1. General
This product is manufactured by LAB GRUPPEN, and it is warranted to be free
from any defects caused by components or factory workmanship, under normal use
and service, for a period of six (6) years from date of purchase from an
authorized LAB GRUPPEN dealer. If the product fails to perform as specified
during the warranty period, LAB GRUPPEN will undertake to repair, or at its
option, replace this product at no charge to its owner, provided the unit is
returned undamaged, shipping prepaid, to an authorized service facility or to
the factory. This warranty shall be null and void if the product is subjected
to: repair work or alteration by a person other than those authorized by us;
mechanical damage including shipping accidents; war, civil insurrection,
misuse, abuse, operation with incorrect AC voltage; incorrect connections or
accessories; operation with faulty associated equipment; or exposure to
inclement weather conditions. Damage due to normal wear and tear is not
covered by the warranty. Units on which the serial number has been removed or
defaced will not be eligible for warranty service. LAB GRUPPEN shall not be
responsible for any incidental or consequential damages. LAB GRUPPEN’s
responsibility is limited to the product itself. LAB GRUPPEN takes no
responsibility for any loss due to cancellation of any events, or rent of
replacement equipment or costs due to a third party’s or customer’s loss of
profit, or any other indirect cost or losses however incurred. LAB GRUPPEN
reserves the right to make changes or improvements in design or manufacturing
without assuming any obligation to change or improve products previously
manufactured. This warranty is exclusive, and no other warranty is expressed
or implied. This warranty does not affect the customer’s statutory rights.
International Warranties Please contact your supplier or distributor for this
information, as rights and disclaimers may vary from country to country.
8.2. Technical assistance and service
8.2.1. International service
If your LAB GRUPPEN product requires repair, contact your LAB GRUPPEN dealer
or distributor, visit http://labgruppen.com/support or contact LAB GRUPPEN by
phone or email to obtain details for the nearest authorized service center.
39 C SERIES Operation Manual rev 2.0.0
8. Warranty and Support
8.2.2. Factory service
In the event a LAB GRUPPEN product requires factory service, you may contact
LAB GRUPPEN’s service department for return instructions and a Return
Authorization number. Please note for product return: 1. Use the original
packing. 2. Include a copy of the sales receipt, your name, return address,
phone and fax number, email address and
description of the defect. 3. Mark the Return Authorization number on the
outside of the packing. Ship the product prepaid to: Music Group Innovation
Sweden AB Faktorvägen 1 SE-434 37 Kungsbacka Sweden Phone: +46 300 56 28 00
Fax: +46 300 56 28 99 service@labgruppen.com www.labgruppen.com
40 C SERIES Operation Manual rev 3.0.0
Notes
Notes
41 C SERIES Operation Manual rev 3.0.0
Notes
Notes
42 C SERIES Operation Manual rev 3.0.0
43 C SERIES Operation Manual rev 3.0.0
labgruppen.com
Intercooler, Class TD, R.SMPS, VPL, BEL, UVL and CAL are national and/or
international trademarks or registered trademarks of Music Group. All other
trademarks remain the property of their respective owners.
Copyright © 2016 MUSIC Group Innovation Sweden AB. All rights reserved.
Item no. OM-CS