ASHLEY TRA-4150 TRA-Series Amplifier Instruction Manual
- June 13, 2024
- Ashley
Table of Contents
TRA-Series Amplifier
Operating Manual
Ashly Audio Inc.
847 Holt Road, Webster, NY 14580-9103
Toll Free 800-828-6308, Telephone
585-872-0010, FAX
585-872-0739
www.ashly.com
All Trademarks referred to herein, are the property of their respective
owners. (R8 0816)
All Rights Reserved
Important Safety Instructions
This power amplifier can produce dangerous output voltage, power and sound pressure levels. In order to minimize the risk of injury, damage, or hearing loss, please read the entire owner’s manual.
The lightning flash with arrowhead symbol, within an equilateral triangle, is intended to alert the user to the presence of uninsulated “dangerous voltage” within the product’s enclosure that may be of sufficient magnitude to constitute a risk of electric shock to persons. The exclamation point within an equilateral triangle is intended to alert the user to the presence of important operating and maintenance instructions in the literature accompanying the device.
- Read these instructions.
- Keep these instructions.
- Heed all warnings.
- Follow all instructions.
- To reduce the risk of fire or electric shock, do not expose this apparatus to rain or moisture.
- Do not use this apparatus near water.
- Clean only with 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 registers, stoves, or other apparatus (including amplifiers) that produce heat.
- 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 are provided for your safety. If the provided plug does not fit into your outlet, consult an electrician for replacement of the obsolete outlet.
- Protect the power cord from being walked on or pinched particularly at plugs, convenience receptacles, and the point where they exit from the apparatus.
- Only use attachments/accessories specified by the manufacturer.
- Use only with the 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.
- Unplug this apparatus during lightning storms or when unused for long periods of time.
- 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.
Introduction
Congratulations on your purchase of an Ashly TRA-Series amplifier. The TRA- Series is made up of high-efficiency, amplifiers incorporating the latest technologies. We are confident that you will be pleased with the high performance, superb sound quality, reliability, and more.
About Ashly
Ashly Audio was founded in 1974 by a group of recording engineers, concert
sound professionals, and electronics designers. The first products were
elaborate custom consoles for friends and associates, but business quickly
spread to new clients and the business grew. The philosophy we established
from the very beginning holds true today: to offer only the highest quality
audio tools at an affordable cost to the professional user – ensuring
reliability and long life. More than thirty years later, Ashly remains
committed to these principles.
Ashly’s exclusive Five Year, Worry- Free Warranty remains one of the most
liberal policies available on any commercial- grade product. The warranty
covers every product with the Ashly brand name, and is offered at no extra
cost to you, our customer.
FCC Compliance
This device complies with part 15 of the FCC Rules. Operation is subject to
the following two conditions:
- This device may not cause harmful interference
- This device must accept any interference received, including interference that may cause undesired operation.
Note: This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in both a commercial and residential installation. This equipment generates, uses and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. 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 off and on, the user is encouraged to try to correct the interference by one or more of the following measures:
- Reorient or relocate the receiving antenna.
- Increase the separation between the equipment and receiver.
- Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.
- Consult the dealer or an experienced radio/TV technician for help.
The TRA Series
TRA-Series amplifiers are high-efficiency, amplifiers incorporating the latest
amplifier technologies.
The series provides a power range of 75 to 150 watts per channel at 4 ohms
(20Hz-20kHz, 1% THD). The TRA series is available in 2 and 4 channel versions
at two power points. All models will drive 4 or 8 ohm loads as well as 25V,
70V, and 100V constant voltage lines. All models are 2RU, with the two and
four channel versions weighing 19.5 pounds and 29.5 pounds respectively. All
TRA amplifiers utilize a state-of-the-art, efficient, high speed switched mode
power supply and offer remote power on/off among the standard features.
TRA-Series Power Ratings (per channel)
| Stereo| Constant Voltage
Model| 8Ω| 4Ω| 25/70V/100V
TRA-2075| 40 W| 75 W| 75 W
TRA-4075| 40 W| 75 W| 75 W
TRA-2150| 80 W| 150 W| 150 W
TRA-4150| 80 W| 150 W| 150 W
Input connections are via 3-pin Euroblock connectors.
Output connectors are screw terminal strips.
Controls on the rear panel include: Gain and channel attenuation.
Protection
TRA-Series Amplifiers come standard with several protection circuits:
Output over-current protection – The output current is limited to safe levels
regardless of load.
DC output protection – The amplifier is switched off if more than 2 volts of
dc is present on the output. The amplifier will automatically restart after 5
seconds (if no fault remains). The protect LED is lit as well as the clip LED
of the affected channel(s).
Main supply rail overvoltage protection – The amplifier is switched off if the
main supply rails have too high of a voltage. The amplifier will automatically
restart after 5 seconds (if no fault remains). The protect LED is lit as well
as the clip LED of the affected channel(s).
Chassis internal temperature monitoring – The amplifier is switched off when
the internal ambient temp reaches 70º C. The amplifier will again switch on
when the internal ambient temp reaches 55º C. The protect LED is lit as well
as the clip LED of ALL channels.
Inrush limiting – The turn-on current is limited. This is active during
initial startup as well as when exiting standby mode.
Mains fuse – There is a 5 amp time delay fuse.
Physical Description
TRA-Series models generally have the same physical design, though there are obvious differences between two and four channel versions. The model number is indicated on the left side of the front panel
Amplifier Front Panel
-
Mounting Holes – For rack mounting.
-
Power Switch – Switches the unit on or off
-
Status LEDs – Indicate status of Power,
Standby, and Protect -
Air Vents
-
Channel LEDs – The Sig LED will begin to
light when the output voltage reaches approximately 0.3 volts. When clipping occurs the Clip LED will light.
Amplifier Rear Panel
-
3-Pin Euroblock Input Connectors – These connectors are used for all input signals.
-
Gain Switch – sets the amplifier gain to +36dB or +26dB sensitivity.
-
Channel Attenuators – These knobs adjust the attenuation of the input signal of each channel from to 0.
Items 1-4 are identical on all channels of all TRA-Series amplifiers, 2 or 4 channel. -
Standby Connector – This 2-Pin Euroblock connector provides for remote standby switching. The Power switch must be in the On position for the Standby connector to be active.
-
Delay Switches – These switches provide turn on delay when the Standby connector is used.
The switches are additive, providing as much as 7.5 seconds of delay -
Screw Terminal Output Connectors – These connectors provide the output signal for each channel. The positive 4/8 (+) and negative () connectors should be used for low-impedance applications. For constant voltage 70V or 100V applications, connect the negative wire (-) of your system to the C (common) terminal and the positive (+) wire to the appropriate Constant Voltage output. For 25V, wire as shown.
-
Mains Connector – Connection to the mains is via this 3-Prong IEC connector
WARNING: Do not remove the mains connector ground.
Installation
TRA-Series amplifiers are designed for use in both fixed and mobile sound systems. Each amplifier is shipped (unless otherwise specified) with the following factory settings:
| Front panel: | Rear panel: |
|---|
On/Off Switch = Off
Attenuators = ∞| Gain Selector = +26 dB
Before connecting to mains power, make sure that the switches are set to the configuration needed for your particular application. Always switch the amplifier off before making any changes to the settings. Failure to do so could result in damage to the unit or other components in your system. CAUTION: When mounting or connecting the amplifier, always disconnect it from the mains. Use four screws and washers when mounting the amplifier to the front rack rails. Rear support is also recommended, especially for mobile or touring use. To reduce the risk of fire or electric shock, do not expose this apparatus to rain or moisture.
Requirements
TRA-Series amplifiers have specific physical, electrical and signal
requirements for proper operation. These requirements will vary depending on
your specific application, setup, and the settings on the amplifier. When
setting up and testing your system, please take special care to double check
all connections and settings. Please refer to the specifications section of
this manual for specific input, output and other figures.
Typical Applications
TRA-Series amplifiers offer many output options. In this illustration, the 4-channel amplifier is receiving two stereo signals and is driving two pairs of stereo speakers.
TRA-Series amplifiers are specifically designed to drive transformer isolated 25V, 70V, or 100V constant voltage (CV) lines. This illustration example shows a 4 channel TRA driving a 70V CV line and 25V line (with two channels still available). Always make sure that the total wattage draw from all the speakers on a CV line does not exceed the rated output of the channel to which they are connected.
Connectors & Polarity
TRA-Series amplifiers utilize professional euroblock audio connectors. For the
inputs, 3pin Euroblock connectors are utilized with their polarity clearly
marked on the amplifier’s rear panel. Outputs are also euroblock connectors,
with polarity clearly marked on the chassis.
NOTE: It is possible to simultaneously drive loads connected to the 8/4 ohm output AND the 25/70/100 volt outputs of a particular amplifier channel. However, care must be taken to ensure that the combined load is not less that the 4 ohm maximum. If you are unsure as to how to determine the combined load, please contact Ashly.
Operation
The amplifier’s On/Off Switch is a rocker-type switch located on the left side
of the front panel. Turning on the amplifier initiates start-up by activating
the inrush current limiter.
When using the remote On/Off function, the main On/Off switch must remain in
the On position. See page 11 for more information on remote On/Off
connections.
NOTE: The power switch does NOT isolate the appliance from mains. Make
sure the mains power socket or an alternative disconnect device is near by and
easily accessible. When the product is connected to mains, the line-filter and
the input of the fuse are energized.
Troubleshooting
| Situation | Indication | Action |
|---|---|---|
| No Sound | Signal LED not lit Clip LEDs not lit | Check AC plug. Confirm that AC |
outlet works by plugging in another device.
Signal LED not lit| Make sure the signal source is operating and try another
cable. Check position of channel attenuators.
Signal LEDs responding to signal level| Check the speaker wiring for breaks.
Try another speaker and cable.
Signal LEDs show red (Protect Mode)| Overheating will cause protective muting.
Check for proper ventilation.
No Channel Separation| No Channel Separation| Check the mode indicators on the
front panel and make sure the mode selector on the rear panel is in the two
channel (stereo) position. Make sure other equipment in the signal path such
as mixers and preamps are set for stereo, not mono
Distorted Sound| Power LED is lit| A faulty speaker or a loose connection
could cause this. Check the wiring and try another speaker.
Signal LEDs responding to signal level| The signal source might be clipping.
Keep the volume pots at least halfway up so that the source does not have to
be overdriven.
Clip LEDs not lit| Keep the volume pots at least halfway up and try changing
input sensitivity with the gain selector on the rear.
Hiss| Hiss| Unplug the amplifier input to confirm that the hiss is coming from
the source or from a device upstream. Erratic or popping noises indicate an
electronic fault in the offending unit. To keep the noise floor low, operate
the primary signal source at full level. without clipping. Avoid boosting the
signal further between the source and the amplifier.
Squeals and Feedback| Squeals and Feedback| Miaophone feedback should be
eliminated with mixer controls. If noise continues to build up with no
microphone gain, there is a serious fault in the signal processors or cables.
Working in succession from the signal source towards the amplifier and check
each device in the signal path by reducing its gain or by unplugging it.
Spec Table
| TRA-2075| TRA-4075| TRA-2150| TRA-4150
---|---|---|---|---
Power Output Per Channel
8 ohms, 80 Hz – 20 kHz, 1% THD| 40 W| 40 W| 80 W| 40 W
4 ohms, 80 Hz – 20 kHz, 1% THD| 75 W| 75 W| 150 W| 150 W
25V/70V/100V CV, 80 Hz – 20 kHz, 1% THD| 75 W| 75 W| 150 W| 150 W
Line Current Draw (all channels driven @4Ω)
Standby| 37mA| 39mA| 89mA| 102mA
Idle| 320mA| 565mA| 370mA| 660mA
1/8 th Power Pink Noise| 0.70A| 1.25A| 1.10A| 1.95A
1/3 Power Sine Wave| 1.23A| 2.25A| 2.10A| 3.80A
Thermal Dissipation (all channels driven @4Ω)
Standby (BTU /hr)| 13| 15| 14| 23
Idle (BTU/hr)| 61| 113| 72| 137
1/8 th Power Pink Noise (BTU/hr)| 73| 145| 111| 211
1/3 Power Sine Wave (BTU/hr)| 85| 150| 126| 263
Signal to Noise (20 Hz-20 kHz, unweighted):| >100 dB| >100 dB| >103 dB| >103
dB
Voltage Gain:| 26 dB, 36 dB sensitivity (selectable)
Output Circuitry:| Class D| Class D| Class D| Class D
Frequency Response| 80 Hz – 20 kHz –3dB +/- 1.0 dB (due to internal 80 Hz HPF)
---|---
Distortion (SMPTE, typical)| < 0.5% – 8Ω load, 10dB below rated power
Distortion (THD-N, typical)| < 0.5% – 8Ω load, 10dB below rated power, 20Hz-
20kHz
Damping Factor – 8 ohm load, < 1 kHz| > 200 into 8Ω
Input Impedance| 20 kΩ, balanced
Maximum Input Level:| +21 dBu
Input Impedance| 20kΩ balanced
Cooling| Convection
Front Panel Indicators per channel| Clip & Signal
Front Panel Indicators overall| power, standby, protect
Attenuators| Per channel: front panel
Input Connectors, each channel| 3- Pin Euroblock
Output connectors, each channel| Screw terminals
Amplifier Protection| Output Overcurent, DC Output, Mail Supply Rail
Overvoltage
Chassis Temperature, Inrush Limiting, Mains Fuse
Power Cable Connector| 3-Prong IEC
Dimensions| 19” x 3.5” x 12” (483mm x 89mm x 305mm)
Net Weight| 19.5 lbs (8.85kg), 29.5 lbs (13.4kg), 19.5 lbs (8.85kg), 29.5 lbs
(13.4kg)
All Specifications Subject to Change or Improvement Without Notice.
Amplifier Dimensions
All TRA Series amplifiers share the same dimensional measurements:
Remote Power Connections
Ashly Audio Inc. Limited Warranty (USA ONLY)
(For other countries, please contact your respective distributor or dealer
from where the unit was first purchased.)
For units purchased in the USA, warranty service for this unit shall be
provided by ASHLY AUDIO, INC. in accordance with the following warranty
statement:
ASHLY AUDIO, INC. warrants to the owner of this product that it will be free
from defects in workmanship and materials for a period of FIVE years from the
original date of purchase, with the exception of touch-screen displays and
motorized faders which are warrantied for THREE years from the original date
of purchase.
ASHLY AUDIO INC. will without charge, repair or replace at its discretion any
defective product or component parts upon prepaid delivery of the product to
the ASHLY AUDIO, INC. factory service department, accompanied with a proof of
original date of purchase in the form of a valid sales receipt. This warranty
gives you specific legal rights, and you may also have other rights, which
vary from state to state.
EXCLUSIONS: This warranty does not apply in the event of misuse, neglect or as
a result of unauthorized alterations or repairs made to the product. This
warranty is void if the serial
number is altered, defaced, or removed. ASHLY AUDIO reserves the right to make
changes in design, or make additions to, or improvements upon, this product
without any obligation to install the same on products previously
manufactured.
Any implied warranties which may arise under the operation of state law shall
be effective only for FIVE years (THREE years for touch-screen displays or
motorized faders) from the original date of purchase of the product. ASHLY
AUDIO, INC. shall be obligated to only correct defects in the product itself.
ASHLY AUDIO, INC. is not liable for any damage or injury which may result from
or be incidental to or a consequence of such defect. Some states do not allow
limitations on how long an implied warranty lasts, or the exclusion, or
limitation of incidental or consequential damages, so the above limitations or
exclusions may not apply to you.
OBTAINING WARRANTY SERVICE:
For warranty service in the United States, please follow this procedure:
- Return the product to ASHLY AUDIO, INC, freight prepaid, with a written statement describing the defect and application that the product is used in. ASHLY AUDIO, INC. will examine the product and perform any necessary service, including replacement of defective parts, at no further cost to you.
- Ship your product to:
Ashly Audio Inc.
Attn: Service Department 847 Holt Road
Webster, NY 14580-9103
Copyright© 2016 – Ashly Audio Inc.
All Rights Reserved
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References
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