eddy he needs a mono amp it would be pointless to run a 4 channel because they are inefficaint nore have i seen a 4 channel amp that is going to put out 750rms when bridged. he cant even use a two channel unless he buys two and uses one for each sub, wich wouldnt make much sence either.
tyler you need a mono amp that is 2ohm stable that puts out around 1500-1700rms
only other think is when you run that much power your stock alternator cant handel it so the amp wont run properly when it draws alot of currnet and may clip your subs, also your altenator and battery will end up dieing. so you need a high output altenator. a good place is excessiveamperage.com