Don't buy a dayton plate amp. I have the 240w one and its nice if you want a clean looking audiophile type subwoofer but if you want to get loud and probably sound better, buy a behringer ep2500 for $250. 2400 watts rms at 4 ohm. You run them on rca to 1/4" (microphone input style) cable or on rca to xlr cable. You would want to run a receiver as a preamplifier to get more signal voltage, not a big deal. Use the sub out on the receiver to y splitter to rca to 1/4" plug.
Hometheatershack.com has been using these things for a long long time to run their HT subs.
the dayton plate amps are very sensitive to bad grounds. Great thing about the b ehringer is that what behringer did was steal a classic QSC amp design and then sell it for half the price. It is virtually the same amp as the QSC rmx 2450.