i have a Infinity reference REF1600A momo amp for sale. im going for a better set up i purchase this amp for $300+
the specs:
Power Output 400 watts RMS x 1 channel at 4 ohms and ≤ 1% THD + N
Signal-to-Noise Ratio 85dBA (reference 1 watt into 4 ohms)
Dynamic Power 600 watts at 2 ohms
Effective Damping Factor 6.3 at 4 ohms
Frequency Response (-3dB) 11Hz to 330Hz (-3dB)
Maximum Input Signal 6V
Maximum Sensitivity 100mV

i will also throw in the remote control in the sale where you can control the peak of the amp in front of the car so you don't have to crawl back there when you want to make an ajustment.
The amp is in great condition no scrachtches or dents only been install for a short couple months and the terminals look almost new.