Rolkolsen hd 5.1 home theater 500 watt subwoofer for Sale in Manteca, CA - OfferUp
Amazon.com: Monolith M-10 V2 10in THX Certified Select 500 Watt Powered Subwoofer - Piano Black Finish | Massive Output, Low Distortion, for Studio and Home Theater Systems : Electronics
Electro-Voice TX1181 500-Watt 18" Subwoofer, Black - ProAudio.com