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MATCH MW 8BMW-D Package Two 8" shallow-mount component subwoofers — designed to fit select BMW vehicles with under-seat subs at Crutchfield
480w Car Subwoofer Under Seat Powered Speaker Alloy Shockproof Power Amplifier Car Stereo High Fidelity Car Audio Music Player - Subwoofers - AliExpress
BassPro SL2 | ["Add high-performance bass with a low-profile woofer enclosure", "Self-Powered, 8\" (200mm) low-profile under seat subwoofer system"]