polkaudio SWA500 Power Amplifier - 800W
The SWA500 is custom engineered to power Polk Audio's CSW Series of built-in subwoofers to rafter-shaking, distortion-free levels.    Class D digital design delivers huge power and runs cool for superb long-term reliability  500 Watts into 4 Ohms at Powers up to two CSW subs of the same model  Front panel Low Pass Filter and Level adjustment knobs make `tweaking` a snap.  Plug in SPEX circuit cards (supplied) optimize the amplifier to match the specific subwoofer model being used  Custom frequency shaping (programmed into SPEX card) for the deepest, most accurate bass perfromance