MTX TR275 Manual page 3

Adjusting the gain
1. Turn the gain control on the amplifier all the way down (counter clockwise).
2. Turn up the volume control on the source unit to approximately 3⁄4 of maximum.
3. Adjust the gain control on the amplifier until audible distortion occurs.
4. Adjust the gain control down until audible distortion disappears.
5. The amplifier is now calibrated to the output of the source unit.
X-Over Switch (X-Over) :
In "LP" position, the active low pass (LP) x-over is turned on to 80Hz 12dB/Oct. Use this position for subwoofer application.
In "HP" position, the active high pass (HP) x-over is turned on to 80Hz 12dB/Oct. Use this position for speaker application.
In "Off" position, the x-over is turned off. The amp is in wide range mode.
Speaker level inputs (High Inputs) : This input will allow the amplifier to operate from source units with speaker-level outputs. Output speaker
leads from the source unit should be tied directly to the wire harness provided with the amplifier.
Note : When speaker level inputs are used, a remote turn on wire must used to switch the amplifier on and off.
External Bass Control Port (Remote) - The Subwoofer Level Control Remote (EBC) plugs directly into this port, while the EBC itself can be placed
anywhere in the vehicle for on demand bass adjustments. Attention, the EBC is optional. You can purchase it separately (Reference : EBC-1).
PowerOn LED (Power) : The LED illuminates green when the amp is switched on.
Protection LED (Protec.) : The LED illuminates red when the amp is in short circuit or thermal protection.
Ground Terminal (GND) : A proper ground is required for your amplifier to operate at peak performance. A short ground cable the same diameter
as the power cable should be used to attach the ground terminal directly to the chassis of the vehicle. Always remove paint, dirt or debris to
expose bare metal where the ground will be attached.
Remote Terminal (REM) : The amplifier can be turned on by applying 12 volts to this terminal. Typically this voltage is supplied by a wire from
the source unit marked "remote" or "power antenna".
(+12V) Power Terminal (12V) : This is the main power input for the amplifier and must be connected directly to the positive terminal of the
vehicles battery for proper operation. Use caution when installing (+12) power cable in the vehicle. Avoid running this cable parallel with RCA
cables, antennas, or other sensitive equipment due to massive currents that can induce noise into the audio system. It is also very important
to have a tight, secure connection for maximum performance. MTX recommends using 8~10mm2 power wire with the MTX TR275 and TR450.
Speaker Terminals (Speaker Output) : Connect speakers to these terminals. Ensure correct polarity, positive-to-positive (+/+) and negative-to-
negative (-/-). Reversing the polarity strongly degrades the bass level and the sound quality.
Bridge Mode :
TR275 : When bridging the amplifier, use the Ch.1 positive terminal and the Ch.2 negative terminal only.
TR450 : When bridging the amplifier, for the two first channels, use the Ch.1 positive terminal and the Ch.2 negative terminal only. For the two
following channels, take the Ch.3 positive terminal and the Ch.4 negative terminal.
Warning : do not bridge the amplifier with an impedance lower than 4Ω.
TR275 TR450