Polk Audio db1040 10-Inch Single Voice Coil Subwoofer (Single, Black) : Electronics
Polk Audio db840DVC db Series 8" subwoofer with dual 4-ohm voice coils at Crutchfield
Buy 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 Online in Germany. B000P0528U
Polk Audio TL1600 Ultra-Compact 100 Watt 8-Inch Powered Subwoofer