Planet Audio, Apocalypse Series AP800.4, Four Channel 800 Watt Amplifier, I think the RMS rating at 100 x 4 is conservative for sure, and if you run it with a capacitor it really hits hard, It has been put away for a few years now but It was just re tested and it all works and sounds great, it has a few small marks and some worn lettering here and there, but it is used and that should be expected,