Kenwood KFC-W3009 12" 4-ohm subwoofer at Crutchfield
Sony Xplod XS-L1235 800W Subwoofer | Reverb
Infinity Kappa 800W Kappa Series 8" subwoofer with selectable 2- or 4-ohm impedance at Crutchfield
DS18 EXL-X6.4D 6.5" Subwoofers Dual 4 Ohm 800 Watt Max Bass Sub Car Au – Pricedrightsales
BLAUPUNKT 10 in. 800-Watt Subwoofer, Non-Pressed Paper Cone, ASV Voice Coil GTX10D
Boss Audio Systems Cxx10 Chaos Exxtreme 10 Inch 800 Watt 4 Ohm Single Voice Coil Car Audio Power Subwoofer Speaker With Polypropylene Cone, Single : Target