Polk Audio DB+ 8 Inch 750 Watt 4 Ohm DVC Marine, ATV & Car Subwoofer (2 Pack) - Walmart.com
Polk Audio PSW10 10" Powered Subwoofer, 100W Peak Power, Compact Design, Easy Setup with Home Theater Systems Black PSW10 - Best Buy
Amazon.com: Polk Audio PSW111 8" Powered Subwoofer - Power Port Technology | Up to 300 Watt Amp | Big Bass in Compact Size | Easy Setup with Home Theater Systems Black : Electronics
Polk Audio DB+ 10 Inch 1050 Watt 4 Ohm DVC Marine and Car Subwoofer (2 Pack) - Walmart.com
DB842 DVC 8" Subwoofer | Car & Marine | Polk Audio
Polk Audio MM840 Mobile Monitor Series 8" subwoofer at Crutchfield