Old school MTX amp. I used this to power everything in my GS430. Awesome amp in perfect working condition. A few scratches on the housing. $100 plus shipping. I'll also throw in plenty of 4 guage power wire.

RMS Power measured at 12.5 Volts DC:
-Front & Rear
25 Watts x 4 into a 4 Ohm load with less than 0.1% Thd+N
50 Watts x 4 into a 2 Ohm load with less than 0.3% Thd+N
100 Watts bridged x 2 into a 4 Ohm load with less than 0.3% Thd+N
-Subwoofer
100 Watts RMS into 4 Ohms with less than 0.3% Thd+N
200 Watts RMS into 2 Ohms with less than 0.5% Thd+N

Dynamic Power (IHF-202 Std) measured at 14.4 Volts DC
-Front and Rear
65 Watts x 4 into a 4 Ohm load
125 Watts x 4 into a 2 Ohm load
250 Watts bridged x 2 into a 4 Ohm load
-Subwoofer
150 Watts x 1 into a 4 Ohm load
300 Watts x 1 into a 2 Ohm load

Signal to Noise Ratio:
> or = 100dB A-Weighted

Damping Factor:
>200

Frequency Response:
20Hz-20kHz±0.25dB

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

Crossover:
-Front
Variable 50Hz to 200Hz, 18dB/Octave, HP Defeatable with 40X Multiplier
-Rear
Variable 50Hz to 200Hz, 18dB/Octave, HP Defeatable
-Subwoofer
Variable 50Hz to 200Hz, 18dB/Octave, LP

Dimensions:
14"x9"x2" (35.6cm x 22.8cm x 5cm)
15 1/4" Wide Including IsoFeet (36.2cm)