1. JBL Xtreme Pro 12 inch subwoofers 2. Pioneer HX-P1212D 12 inch subwoofers 3. Polk Audio P-1212 12 inch subwoofers 4. Yamaha YP-1212 12 inch subwoofers 5. NAD CDP-1212 12 inch subwoofers 6. Sony STR-DG812 12 inch subwoofers 7. Pioneer VSX-1212 12 inch subwoofers 8. Alesis LS-1212 12 inch subwoofers 9. NAD CDP-1212A 12 inch subwoofers 10. Behringer BX-1212 12 inch subwoofers 11. Yamaha YP-1212A 12 inch subwoofers 12. NAD CDP-1212B 12 inch subwoofers