Active Car Audio System 10 Inch Subwoofer 30Hz-80Hz Bass Square Speaker - China High Sensitivity Car Subwoofer, 10inch Square Car Subwoofer | Made-in-China.com
12" Dual ported / vented sub box sub woofer enclosure 30Hz competition sub box Cajon De Bocina for Sale in Montclair, CA - OfferUp
12 inch subwoofer tuned @ 30hz | Parts Express Project Gallery