MATCH UP W8BMW-S Two 8" shallow-mount component subwoofers — designed to fit select BMW vehicles with under-seat subs at Crutchfield
Amazon.com: BESTISAN 8" Powered Subwoofer, Up to 150 Watt Sub, Incredible Deep Bass, Easy Setup with Home Theater Systems, Black : Electronics
Amazon.com: Polk Audio HTS 10 Powered Subwoofer with Power Port Technology | 10” Woofer, up to 200W Amp | For the Ultimate Home Theater Experience | Modern Sub that Fits in any
Amazon.com: BESTISAN 8" Powered Subwoofer, Up to 150 Watt Sub, Incredible Deep Bass, Easy Setup with Home Theater Systems, Black : Electronics