Amazon.com: Earthquake Sound SLAPS-M12 12-inch Passive Radiator for Home and Mobile Audio Subwoofer Enclosures : Everything Else
EAW SBX220 Dual 12" Passive Subwoofer (church owned) SHIPPING NOT INCLUDED CG00HQ4 | Reverb
Wet Sounds Revo 12 PSE (Black w/black grille) Revo Series sealed marine subwoofer enclosure with 12" 4-ohm subwoofer and 12" passive speaker at Crutchfield