ASHLY TRA-2075 [4/12] The tra series
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ASHLY TRA-2075 [4/12] The tra series

ASHLY TRA-2075 [4/12] The tra series
Page - 4 Operator Manual – TRA Series Amplifiers
Copyright© 2013 – Ashly Audio Inc.
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.
Important Safety
Instructions – 2
Introduction - 3
The TRA Series - 4
Protection
Physical Description - 5
Installation - 6
Operation - 8
Troubleshooting - 9
Spec Table - 10
Dimensions - 11
Warranty - 12

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