MTX Thunder 275X 2-channel amp

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This amp worked fine a few years back when I quit using it, however, when I recently wired it back up for testing, it now has an issue. When wired to a subwoofer in bridged mode I found the amp was sending a rythmatic signal to the sub as soon as it powered on, before any sort of music playback could begin. This rythmic thumping was able to be done away with by merely using one of the RCA inputs and not both. I am not sure of why this is occuring and in truth, I never before used it for powering subs. It could be a simple wiring/setup mixup on my behalf, but without further testing, I can't be sure. I used this amp to power a set of 6x8 speakers back in the day and it performed flawlessly back then. The amp has seperate gain controls for the left and right channels and I honestly am not sure how it's meant to be setup when used in bridged mode because of this. I located an owners manual for it, but sadly it was of no help on the matter. So... I'm selling the amp as being broken now, weather or not it actually is.

 

MTX Thunder 275X 2 channel amp specs

Specs:

RMS Power measured at 12.5 Volts DC:
37.5 Watts x 2 into a 4 Ohm load with less than 0.05% Thd+N
75 Watts x 2 into a 2 Ohm load with less than 0.1% Thd+N
150 Watts bridged into a 4 Ohm load with less than 0.1% Thd+N

Dynamic Power (IHF-202 Std) measured at 14.4 Volts DC
85 Watts x 2 into a 4 Ohm load
140 Watts x 2 into a 2 Ohm load
280 Watts bridged into a 4 Ohm load

Signal to Noise Ratio:
> or = 110dB A-Weighted

Damping Factor:
>200

Frequency Response:
20Hz-20kHz±0.25dB

Thunder EQ:
Variable Bass Boost (0-18dB) centered at 40Hz

Crossover:
Variable 50Hz to 200Hz, 18dB/Octave, High Pass or Low Pass Configurable

Dimensions
8" x 9" x 2" (20.3cm x 22.8cm x 5cm)
9-1/4" x 9" x 2" (23.5cm x 22.8cm x 5cm) Including IsoFeet(TM)

Now MTX under rates their gear quite signifiacantly, the true output of this amp is going to be every bit of the dynamic power rating (if not more, while the car is running), if your car's electrical system is working properly. At the typical %50 efficency of a class A/B amplifier, this amp would generate 288RMS bridged at 4 ohms. It's very likely this amp could be 55% efficent or more (not uncommon for MTX amplifiers), meaning it could and likely pumps out over 300RMSx1@4 ohms.

$10 firm

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