I have an excelon mono amp. It's been used for a year...bought it for $400, I'll sell it for $200. Here's the specs.
KAC-X810D Class D Mono Power Amplifier
Maximum Output Power: 1600 Watts x 1
Power Output at 2 Ohms, at 12V (1kHz, 0.5% THD): 600 Watts x 1
Power Output at 2 Ohms, at 14.4V (1kHz, 0.5% THD): 800 Watts x 1
Power Output at 4 Ohms, at 12V (20Hz-20kHz, 0.05% THD): 300 Watts x 1
Power Output at 4 Ohms, at 14.4V (20Hz-20kHz, 0.05% THD): 400 Watts x 1
Bass Management System
50-200 Hz low-pass crossover, 24 dB/octave
Infrasonic filter (15 or 25 Hz selectable, 24 dB/octave)
12 dB bass boost variable from 40-100 Hz (expandable to 6/12/18 dB when connected to a Kenwood Excelon receiver equipped with BMS controls)
Phase inverter (0-180 degrees)
Preamp outputs
Speaker short, low battery, thermal overload, and DC protection
Variable color indicator
Gold-plated terminals