I have a MA Audio M686i, 800 Watt 2 Channel Amp thats broken, but I have no clue whats wrong with it, this thing pushed 2 type R's pretty well, and got them loud, I really think its just the Mosfets.

Im looking to trade this for a 4 channel amp, or 2 channel amp that does 75x4, or 75x2@ 4 ohms.....