Here's an Infinity package that has just about everything you need for some great-sounding bass. You'll get an Infinity Reference 7520a 2-channel amp and two Infinity Reference 1030w 10" subwoofers just add a sub box and wiring and you're ready to roll.
The system's Infinity Reference 1030w subwoofers provide plenty of low-note impact. This sub incorporates a large 70-ounce magnet for excellent power handling, and its sturdy basket eliminates resonances that can lessen bass quality. The subs work well in sealed or ported boxes, and can handle up to 250 RMS watts of power.
The Infinity Reference 7520a 2-channel amp powers the subs. Its high-output design feeds the subs plenty of clean, undistorted power. The amp's low-pass filter sends the right frequencies to the Reference subwoofers, and there's a built-in bass boost circuit if you desire a little more thump in your tunes.