Polk Audio PSW125 (Black) Powered subwoofer at Crutchfield
Polk Audio DSW PRO 440 8" 180W Subwoofer (Black) DSWPRO440 B&H
Polk Audio PSW250 Powered Subwoofer Speaker Tested & Working | eBay
Polk Audio PSW110 110V Cherry Wood Subwoofer (Mint condition) | Reverb
Polk Audio React Sub 7" Wireless Subwoofer for React REACT_SUB
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
Monitor XT12 Subwoofer - 100W 12" Woofer | Polk Audio
Best Buy: Polk Audio 10" Dual-Voice-Coil 8-Ohm Subwoofer Black DXi104 DVC
Polk Audio USA Made RM1000W Subwoofer | Reverb
Polk Audio PSW Series PSW110 Black High Performance Powered