Rockville W10K9D4 10" 3200w Car Audio Subwoofer Dual 4-Ohm Sub CEA Compliant
Buy Wholesale China Bestquality Car Speaker Subwoofer Series 1200w Max 2.5basv Voice Coil 156×20×2 Rms 600w Automotive & Car Speaker at USD 37 | Global Sources
Car subwoofer buying guide
P 30 DB Subwoofer - Focal | Focal
Car Amplifier Buying Guide: Picking The Right Amp For Your Car Audio - Sonic Electronix Learning Center and Blog