If your going to play those bad boys hard I say class d mono. The amp is more stable with wattage and shouldnt heat up as bad. But a 2 channel class A or B amp with the correct rms will also do the trick. Its all about prefrence and listening style (IMO):thinking: . Most (newer)mono amps are smaller as well due to the thick heat sinks. I say Mono for subwoofers FTW!