Amazon.com: DS18 PSW12.4S 12" Shallow Mount Subwoofer 1200 Watts Max Power 600 Watts RMS Single Voice Coil 4 OHMS Water Resistant - Best Sub for Tight Spaces in Car & Trucks - 1 Speaker : Electronics
Sundown Audio SLD-12 inch Dual 2 ohm Shallow Mount Subwoofer SLD Serie – Droppin HZ Car Audio
Kenwood Excelon KFC-XW1200F Shallow-mount 12" 4-ohm subwoofer at Crutchfield