polkaudio SWA500 Power Amplifier - 800W<div style="text-align: left;"><strong>[Product Information]</strong><ul><li><span class="a-list-item"> Designed specifically to power Polk Audio's CSW Series of built-in subwoofers </span></li><li><span class="a-list-item"> Class D digital design delivers huge power and runs cool for superb long-term reliability </span></li><li><span class="a-list-item"> 500 Watts into 4 Ohms at &lt;0.01% THD </span></li><li><span class="a-list-item"> Powers up to two CSW subs of the same model </span></li><li><span class="a-list-item"> Front panel Low Pass Filter and Level adjustment knobs make "tweaking" a snap </span></li></ul></div><img src="http://ecx.images-amazon.com/images/I/31VjZXS2x2L.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/31T4nIWtOsL.jpg" noproxy>