STEWART AUDIO CVA50-1 NET Series Compact Network Amplifier Owner’s Manual
- June 3, 2024
- STEWART AUDIO
Table of Contents
STEWART AUDIO CVA50-1 NET Series Compact Network Amplifier
Important Safety Instructions
Before using your Stewart Audio Inc. Power Amplifier, please read this Owner’s Manual carefully to ensure optimum trouble-free performance.
WARNING:
TO REDUCE THE RISK OF ELECTRICAL SHOCK, DO NOT EXPOSE THIS AMPLIFIER TO RAIN
OR MOISTURE. DANGEROUS HIGH VOLTAGES ARE PRESENT INSIDE THE ENCLOSURE. DO NOT
OPEN THE CABINET. REFER SERVICING TO QUALIFIED PERSONNEL ONLY.
CAUTION:
TO REDUCE TiiE RISK OF ELECTRIC SHOCK, DO NOT REMOVE COVER (OR BACK), NO USER-
SERVICEABLE PARTS INSIDE. REFER SERVICING TO QUALIFIED SERVICE PERSONNEL,
- The lighting bolt within the arrowhead symbol, within an equilateral triangle, is intended to alert the user to the presence of un-insulated “dangerous voltage” within the product’s enclosure that may be of sufficient magnitude to constitute a risk of electrical shock to a person.
- The exclamation point within an equilateral triangle is intended to alert the user to the presence of important operating and maintenance (servicing) instructions in the literature accompanying the appliance.
Important Safety Instruction – Please Read Prior to Product Installation.
- Installation should be performed by a trained and licensed professional to insure safe and lasting operation.
- All of the safety and operating instructions should be read before the amplifier 1s installed or operated. Retain these instructions for future reference. All instructions should be followed; all warnings on the amplifier and in the operating 1nstruct1ons should be adhered to.
- The amplifier should be situated so that its location and position does not interfere with its proper ventilation. For example, the amplifier must not be placed on a rug, bed, sofa or similar surface that impedes airflow across the chassis. Airflow around the unit should be unobstructed.
- This amplifier should not be used near water, for example, near a bathtub, in a wet basement, near a swimming pool, etc. This amplifier is intended to be operated in a controlled indoor environment.
- Do not place the amplifier near heat sources such as radiators, heat registers, stoves, or other appliances that produce heat.
- The amplifier’s power supply should only be connected to 120 VAC, 60 Hz power source. Do not defeat the ground or polarization of the power plug.
- Route power cord and other cables so that they are not likely to be walked on, tripped over or stressed. Pay particular attention to condition of cords and cables at plugs and at the point where they exit the amplifier. To prevent risk of fire or injury, damaged cords and cables should be replaced immediately.
- Clean the amplifier with a clean, damp cloth. Do not use solvents or abrasive cleaners. Never pour any liquid on the amplifier.
- When left unused for a long period of time, the power cord should be unplugged from the outlet.
- Damaged Amplifiers requiring service should be repaired by a qualified service technician when:
- The power cord or AC plug has been damaged.
- Objects have fallen, or liquid has spilled into the unit.
- The amplifier has been exposed to rain or other moisture.
- The amplifier does not appear to operate normally or exhibit a marked change in performance.
- The amplifier has been dropped or the enclosure damaged.
- The user should not attempt to service the amplifier beyond that described in the operating instructions. All other servicing should be referred to qualified service personnel.
Welcome
Congratulations on the purchase of your new Stewart Audio CVA Series power
amplifier. This amplifier has been designed and built to provide you with
years of high-quality audio performance and trouble-free operation. If after
reading this manual you should have any questions concerning amplifier
installation and operation, please contact your Authorized Stewart Dealer, or
you may contact us directly using the contact information provided on the back
of this manual.
Features
Your Stewart Audio CVA Series amplifier is the result of years of experience in the design and manufacture of quality amplifiers. As such it provides a combination of performance and operational benefits that simply cannot be found in conventional amplifiers.
- Sub Compact 7/3 rack package
- Dante enabled for two channels of networked audio
- Mono constant voltage amplifier (1 00V or 70. 7V)
- Selectable priority switching (NET+ only)
- Remote volume control (NET+ only)
- Multiple mounting options
- External inline power supply
- Made in the USA
Using this Manual
In order to obtain maximum performance from your CVA Series Amplifier, please take time to read this brief owner’s manual and ca refully follow the guidelines for connection and operation.
This manual provides you with the information necessary to safely install and operate your new CVA Series amplifier in the most common scenarios. If you find yourself requiring additional ass·1stance, please feel free to contact your Authorized Dealer, or you may contact us directly using the contact information provided on the back of this menu.
Setup
Setup Precautions
CAUTION:
Before installing your amplifier, make sure that you have read the Important
Safety Precautions at the beginning of this manual.
Amplifier Installation
The CVA Series incorporates a number of different mounting options in order
to fit your installation needs.
Pole-Mount Installation
The CVA Series amplifier casing has mount holes on the top of the unit which
can be used with the AV-Pole bracket available from Stewart Audio. Two screws
are included in the kit which will affix the bracket to the top side of t he
unit.
Universal-Mount Installation
The CVA Series also has a universal bracket available which allows the unit to
be mounted against a wall or under a table. Two screws are included in the kit
which will affix the bracket to the top of the unit. Once this is done, two
holes are available for mounting the unit where desired.
CAUTION:
Use only the screws provided in mounting brackets to the amplifier. Do not
over-tighten.
Product Dimensions
Proper Cooling Considerations
Because CVA Series amplifiers are convection cooled with no fan, the
amplifiers must be given adequate space to allow for proper airflow. Do not
stack the amplifiers on top of each other or mount it in a way that other
equipment will block airflow along the surfaces of the case.
CAUTION:
Inadequate airflow to the amplifier can cause the amplifier to overheat and
potentially become damaged in the process. Be sure to provide plenty of air
space to allow for convection cooling.
Input Connections (NET+ Models Only}
Your CVA Series amplifier is provided with a 3-pin Euro Block connector for
its input connection. This connector will accept both balanced and unbalanced
connections, however, some modifications must be made for an unbalanced
connection. See the next two sections for instruct ions on connecting your
amplifier to its input source.
Balanced Input Connections
When using a balanced input source and connector, you must ensure that the
hot, cold, and ground pins of the connector are matched up to the+,-, and
ground pins of the CVA Series’ Euro Block connector respectively. Diagrams
have been provided for standard XLR and TRS connectors. Please refer to the
manual of your input source in case it does not follow the standard pin-out.
NOTE:
The CVA Series of amplifiers do not accept TRS inputs wired for a stereo
source. TRS inputs should only be used for balanced mono inputs.
Unbalanced Input Connections
When using an unbalanced input source and connector, a jumper must be added
between the negative (-) terminals and the ground terminals. Once this has
been done, the unbalanced source can be connected to the positive(+) and
ground terminals. Please refer to the manual of your input source in case it
does not follow the standard pin-out. For your convenience, pre-wired
connectors are available for purchase, see the next page for details.
NOTE:
A jumper is required for connecting an unbalanced input.
NOTE:
The CVA Series of amplifiers do not accept stereo inputs. Either one side must
be selected from the stereo source or an overload-protected Y-cable must be
used to sum them to mono. It is highly recommended that you purchase the pre-
wired connectors mentioned on the next page. Damage to source equipment can
result from the Pre-wired unbalanced connectors are available for purchase
from Stewart Audio. These will allow for a quicker installation with less room
for error when connecting the CVA Series amplifier to an unbalanced source.
The summing adapters will properly sum a stereo source for use with the mono
input on the rear of the amplifier without causing sound cancellation. Part
numbers are found below the diagrams.
Output Connections
Because of the differences in the way that constant-voltage amplifiers work as opposed to a typical 8-ohm setup, the wiring procedure and the gauge of wire used is very different.
Constant voltage systems and speakers use a smaller current flow than the typical Sohm systems and thus can use a higher gauge {thinner diameter) wire. Please refer to the following g chart to choose the appropriate wire gauge for your installation.
Distance
- Up to 500ft
- 500-1 000 ft.
- Over 1000ft
Wire Gauge
- 22AWG
- 20AWG
- 18AWG
Speaker leads connect by means of removable Euro Block connectors supplied with the unit. Strip speaker leads 1 /4″ and insert leads into connector observing proper polarity. With a small, flat-blade screwdriver, tighten the screw until the leads are held securely in place. Inspect for possible shorts or broken wires.
Constant Voltage
The Euro Block connector on the rear of the amplifier is capable of
supplying output at either 1 00V or 70V depending on the step-down
transformers which will be used in the speaker installation. For information
on specific step-down transformer installation information, please consult the
transformer’s manufacturer’s literature.
Wiring Example
The diagram below is a typical wiring setup for two speakers with outboard
step-down transformers wired in parallel to the 70V output option of a CVA
Series amplifier.
Operation
Operating Precautions
- Before use, your amplifier must be configured for proper operation, including input and output wiring hookup. Improper w hiring can result in damage to equipment or potential harm to the operator. Consult section 2 for setup instructions.
- Tampering with the circu·1try, or making unauthorized changes is not only dangerous but may also violate local regulations.
- Use care when making connections between the amplifier and the input or output equipment. Using equipment that is not capable of handling the output wattage may lead to permanent damage.
NOTE:
Stewart Audio will not be held responsible for damage to your CVA Series
amplifier or connected equipment if the instructions in this manual are not
followed.
NOTE:
For additional operating precautions, please refer to “Important Safety
Instructions”.
Controls, Indicators, and Connectors
- Signal Priority Switch
- Network Connector
- ChannellevelKnob
- Input Connector
- LineOut
- Remote Volume Control
- Signal Present Indicator LED
- Power Indicator LED
- Clip Indicator LEDs
- Power Connector
- Speaker Out Connector
- Network Connector
- LineOut
- Signal Present Indicator LED
- Power Indicator LED
- Power Connector
- SpeakerOutConnector
Indicators
CVA Series amplifiers have three rear panel LEDs to indicate the status of the
amplifier. The blue LED, labeled “ON”, will be lit when the unit is connected
to a power source. The green LED, labeled “SIG”, will light when an audio
signal is present on the audio input. When the signal is present and the
output is going to the speakers the red LED, labeled “Clip”, will light when
the input level signal is too high. The “LEVEL” control must be adjusted until
the CLIP LED goes out for undistorted sound amplification.
Controls (NET+ Models Only)
All CVA Series controls are located on the rear of the unit There is no power
switch so the amplifier will power up immediately after being connected to a
power source.
The level control adjusts the level of the local input signals only. It does not adjust the Dante network audio signal level. This level must be adjusted at the signal source or via a network audio device. The rear panel contains a single-level control knob. The amplifier is set to run off of a line-level source and the level should be adjusted for optimum performance. To adjust this knob, you will need a small flat-head screwdriver. While a typical program source level is present. spin the rotary knob as far clockwise as you can without hearing distortion or without the “Clip” indicator illuminating. If the signal is distorting and the knob is all the way counter-clockwise, adjust the gain down at the source level.
Signal Priority Switching (NET+ Models Only)
The CVA50-1 NET+ amplifier includes selectable priority switching which allows
either the network or local input to override the other input depending on the
switch setting. The switch position should be set to the priority input — the
signal that will interrupt the “normal” program. When audio is detected on
that priority input the amplifier will mute the signal from the other
(“normal”) input. After an approximately 3.5-second period with no signal on
the priority channel, the “normal” signal will be unmuted. For example, if a
local microphone is to be used as a priority page, set the priority switch to
“Local”. When a microphone signal is detected the “normal” network audio will
be muted and the page will come through.
Dante
If you have selected the Dante version of the CVA50-1 NET series, the
configuration is done using the Dante Controller software from Audinate.
Dante Controller Software can be found on Audinate’s website at www.audinate.com.
From there you can select Dante Controller under the Products section. This will require registration for Audinate’s portal and also includes access to the Dante Controller User Manual which should be read for complete configuration instructions.
Using Audinate’s Dante Controller Software
Once Dante Controller has been installed follow the instructions in the
Dante Controller Software User Manual (found at
www.audinate.com) launch the application to see the
connection matrix.
Unlike Cobra Net, Dante does not require IP configuration or bundle configuration. Instead, connections are made on the connection matrix shown above
**All Stewart Audio products will ship from the factory as named Ultimo-
Dante FAQ
Q: I am having problems installing or using the Dante Controller Software
A: Please refer to the official documentation available in the Audinate portal
where you downloaded the Controller Software.
Q: I do not see the CVA50-1 NET series showing up on the network.
A: All Stewart Audio products are tagged as Ultimo-
Remote Volume Control (NET+ Models Only)
CVA50-1 NET+ amplifiers can have their volume remotely controlled (or
muted) via the Euro Block input on the rear of the amplifier. The remote
volume control allows the volume of the unit to be controlled through the use
of an external potentiometer which can be located wherever convenient for the
user. Remote muting is also useful for fire-alarm situations in which all
unnecessary sounds must be silenced. The level control adjusts the level of
the local input signals only. It does not adjust the Dante network audio
signal level. This level must be adjusted at the signal source or via a
network audio device.
NOTE:
If the remote volume control connector is utilized, it will override the
volume knob on the rear of the unit.
In order to remotely control the volume of the unit, a 1 Ok-ohm potentiometer should be placed between the+ 1 OV pin and the GND (Ground) pin on the rear of the unit with its wiper on the RVC pin. The volume will be determined by the selected resistance on the potentiometer, the greater the resistance the louder the volume. The amplifier can be remotely muted by making a connection between the GND pin and the MUTE pin. No power should be applied to these pins, simply a contact connection.
Troubleshooting
Problem: Power indicator does not turn on
Procedure:
Check that the unit’s power supply is plugged into a functioning outlet and
the power supply is correctly connected to the unit.
Problem: No output heard on speakers; Blue power indicator is lit
Procedure:
Check that level controls are not turned down. Check that input and output
connections are secure. Ensure signal present LED is lit to denote a signal.
If there is no signal detected check the signal source and that level controls
are set high enough.
Problem: Amplifier overheats and/or shuts off
Procedure:
Review section 2.3 on proper cooling procedures. Check the clip LED on the
rear of the amplifier to see if the signal is overdriving (the signal light
flashes red frequently). Overdriving the amplifier for extended periods of
time can cause a thermal shutdown.
Problem: Output sound is distorted or cracking
Procedure:
Check all cables for damage or lose connections and reduce the gain on the
input signal at the mixer or preamp level. Replace the cables and loudspeakers
temporarily to see if this resolves t he problem. If the problem still exists,
contact your Authorized Dealer for service.
Technical Specifications
- Maximum Output 30Hz – 20kHz
- CVA50-1 NET/NET+ 50W@ 100V/70V
- Frequency Response (+O, -3 dB) 100Hz-20kHz
- Power Bandwidth +/- 3dB 80Hz-30kHz
- THD+N <0.1%
- Signal-to-Noise Ratio >80d8
- Remote Volume Control 0-lOV DC, 4-pin Block
- Input Sensitivity 0.5V (-3 dBV)
- Standard Voltage Gain 150X (43dB)@ 70.7V
- Input Impedance (Balance/Unbalanced) 20k Ohms/1 Ok Ohms
- Power Consumption: Idle; 1 /8 Draw 6.1 Watts; 14 Watts
- Class D
- Input Connectors RJ45, Euro Block 3-pin, 3.5mm (NET+)
- Output Connectors Euro Block 2-pin, 5mm
- Power Supply External In-Line 48DVC
- Cooling Convection-Cooling
- Controls Level
- LED Indicators Power, Signal, Clip
- Construction Aluminum Chassis
- Plenum Rating UL 2043 Approved
- Dimensions
- Height 1.25in (3.2cm)
- Width 6 0Oin (152cm)
- Depth 4.00in (10.2cm)
- Weight 1.2 lbs (0.54kg)
Stewart Audio reserves the rn te to change features and specifications without notice.
Warranty Information
Warranty Summary
All Stewart Audio ampl”1fiers and accessories, unless excluded in this summary, are covered by a 3-year limited warranty on parts and labor from the data of purchase. In order to be eligible tor warranty repairs, the amplifiers and accessories must have been purchased through an authorized Stewart Audio dealer and submitted by the original purchaser. This warranty is only valid in the country in which the amplifier was purchased.
Eligibility Requirements
Stewart Audio warrants against all malfunctions which come as a result of
component or manufacturer defect. The amplifier is also covered from all
failures which arise during the warranty period (3 years from date of
purchase} that are not a result of misuse. The following actions will void
your warranty:
- The power cord or AC plug has been damaged through m·1suse.
- The amplifier has been exposed to moisture or extreme temperatures.
- The amplifier has been dropped, items have been dropped on the amplifier, or the enclosure has been damaged.
- The amplifier has been opened by the operator.
- The amplifier was improperly packaged when sending to the factory for repair, resulting in damage.
- Any of the precautions or instructions found in this manual were not followed.
Damages resulting to the amplifier which are not covered under this warranty can be factory-repaired at cost to the customer. Use the contact informat’1on below to initiate the repair process.
Return Procedure
This section ·includes the return procedures which must be followed in order
to prevent processing delay or cost to the customer. Please read the entire
section before contacting Stewart Audio for returns.
Return Authorization Number
All returns to the factory for service must be accompanied by a Return
Authorization (RA) number. One can be obtained by contacting Stewart
Audio at 209-588-8111 or via e-mail at
[email protected].
NOTE:
Any defective products received without an RA number will be returned to the
sender at their expense. If Stewart Audio is unable to contact the sender in
14 days, the merchandise will be considered scrap and may be disposed of.
Shipment Instructions
If Stewart Audio requests that you ship the defective product back to their
service center, please refer to the guide below. To ensure prompt warranty
service, be sure to follow all instructions.
-
Return Authorization (RA) is required for a product being sent to the factory for service.
-
See packing instructions in section 6.2.3.
-
Ship the defective product using a method that provides for order tracking or order confirmation. The service center is located at the following address:
Stewart Audio 14335 Cuesta Court Suite C Sonora, CA 95370 -
Use a bold black marker and write the RA number on three sides of the box.
-
Record the RMA number for future reference. The RA number can be used to check the repair status.
Packaging Instructions
Should Stewart Audio request that you ship your product to their service
center, these instructions must be followed in order to ensure safe delivery.
If they are not followed, Stewart Audio assumes no responsibility for damaged
goods and/or accessories that are sent with your unit.
- Please write the RA number on three sides of the box. Include the Stewart Audio RA number inside the box and a brief description of the problem.
- You will be advised during the RA process what accessories should be included with the amplifier (Power supplies, connectors, cords, etc.). This is dependent on the failure assessment.
- When shipping your amplifier, it is important that it has adequate protection. We recommend you use the original packing material when returning the product for repair. If you do not have the original box, see number 4.
- If you provide your own shipping pack, the minimum recommended requirements for materials are as follows:
- 275 P.S.I. burst test, Double-Wall carton that allows for 2- inch solid Styrofoam on all six sides of the unit or 3 inches of plastic bubble wrap on all six sides of unit.
- Securely seal the package with adequate carton sealing tape.
- Do not use light boxes or “peanuts”.
NOTE:
Damage caused by poor packaging will not be covered under warranty.
Estimate Approval
An estimate for all non-warranty repairs will be provided to the customer once
the unit has been shipped to the factory. The customer is responsible to
approve this estimate within 7 days. If the repairs are not approved within 14
days, Stewart Audio reserves the right to consider the unit scrap and may
discard it.
Payment of Non-Warranty Repairs
Payment for non-warranty repairs must be submitted to Stewart Audio before the
product will be returned to the customer.
Accessories
The following accessories are available from Stewart Audio for your amplifier. All part numbers shown are Stewart Audio Part Numbers.
Mounting Brackets
- AV-POLE Pole-mount bracket for AV Series amplifiers
- AV-BRACKET Universal mounting bracket for AV Series amplifiers
Connection Adapters
- ADPT-RCA Mono Female RCA to male Euroblock.
- ADPT-SUMRCA Stereo Female RCA to male Euroblock.
- ADPT-SUM35 Stereo Female 3.5mm to male Euroblock
Wall Plates
- WP-RVC-B Wallplate with 1 Ok potentiometer and knob for remote volume control (Black)
- WP-RVC-A Wallplate with 1 Ok potentiometer and knob for remote volume control (Aluminum)
To purchase these accessories or to see the full Stewart Audio product lineup, visit us at:www.stewartaudio.com.