Polk Audio HTS 12 in. Powered Subwoofer with Power Port Technology AM7516 - The Home Depot
Polk Audio AM7516 400 Watt 12 Inch Subwoofer with Power Port Technology, Black - Walmart.com
Polk Audio DSW PRO 440 8" 180W Subwoofer (Black) DSWPRO440 B&H
Polk Audio PSW300 - Subwoofer | PSW300 | Reverb
Polk Audio PSW110 (Black) Powered subwoofer at Crutchfield
DB1042 DVC 10" Subwoofer | Car & Marine | Polk Audio
Amazon.com: Polk Audio PSW10 10" Powered Subwoofer – Power Port Technology, Up to 100 Watts, Big Bass in Compact Design, Easy Setup with Home Theater Systems, Timbre-Matched with Monitor & T-series Polk