Polk Audio PSW505 12-Inch Powered Subwoofer (Single， Black)<div style="text-align: left;"><strong>[Product Information]</strong><ul><li><span class="a-list-item"> Real wood veneer finish， Slot Load Venting improves bass response. The wide， long Slot Load Vent dramatically lessens turbulence， noise and distortion， pouring out a tidal wave of precise， thunderous bass! </span></li><li><span class="a-list-item"> Polk subs sound better because they're built better. Rock-solid MDF construction (including a 1 inch thick front baffle) suppresses enclosure panel resonance for distortion-free， accurate response， big 12 inch long throw driver for longer excursion and better linearity. </span></li><li><span class="a-list-item"> Huge Hi-Roll Surrounds that support their longer excursion， Most powered subwoofers are good for just gut-rumble and boom. Polk understands that you listen to music too so our subs are tight， precise and accurate. </span></li><li><span class="a-list-item"> High current 300 Watt Continuous (460 Watt Dynamic) power amplifier， Adjustable low pass crossover， phase switch and volume control allows perfect blending with any main speaker. </span></li><li><span class="a-list-item"> Auto on/off circuit that automatically turns your subwoofer on when it senses a program signal. When no signal is present， the amplifier turns off within 15 minutes， Unfiltered LFE input for use with low pass filtered subwoofer output jacks. </span></li></ul></div><img src="http://ecx.images-amazon.com/images/I/51GOiuLbhLL.jpg" noproxy>