No longer made. Supposedly a good amp, never installed, friend gave to me because of owed money and now am selling. Good working condition, will sell for $175+ shipping...

Xtant 404m 100x4

Features:

Fully regulated, PWM power supply.
Doubling of power from 4 to 2 Ohm loads.
Hand-matched, complementary MOSFETS for better performance and sound quality.
Fully discrete power amp.
Independent amplifier gain adjustment.
Over-current and thermal protection circuitry.
Selectable Balanced line inputs.
Unbalanced input sensitivity (100 mV to 8 V RMS) adjustable in 10 dB steps.
Balanced Input sensitivity (100 mV to 17 V RMS) adjustable in 10 dB steps.
Four amplifier accessory ports which accept our plug-in modules.
Specifications:

4 x 50 Watts Per Channel @ 4 Ohm
4 x 100 Watts Per Channel @ 2 Ohm
2 x 200 Watts Per Channel @ 4 Ohm Bridged