Polk Audio Monitor X10 10" 100W Subwoofer 300648-01-00-101 B&H
Review: Polk PSW 108 Compact Powered Subwoofer
File:Rear panel of a Polk audio sub-woofer.jpg - Wikipedia
Polk Audio PSW10 Powered Subwoofer | Reverb Romania
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