WC i have a brand new zapco 500m referance amplifier thats rare and its a class AB mono amplifier. It can do 538 x 1 @4ohms and 700 x 1 @ 2ohms. This is a underated amplifier. I was gonna run it off of a ID MAX 12 dual 4ohm vc sub but i may sell it for a good price. Im looking for $550 for it and i will even add a bonus bass controller(retail $50.00) so you can mount it up front by your HU for extra control. You can ask anybody that knows about caraudio about this zapco. Its way better then kicker and jbl and even jl. Hope you find what your looking for. Let me know if interested or else ill just keep it. This amp is a year old and is now rare and hard to find anywhere online. Retail price is $600