Amazon.com: Universal Car Stereo Vented Port Single 12" Alpine S-W12D4 Type S Car Audio Subwoofer Custom Sub Box Enclosure Package New Without Amp : Electronics
10" Subwoofer Comparison - Alpine type S VS Mordaunt Short - YouTube
Best Buy: Alpine Type-S 10" Dual Voice Coil 2-Ohm Subwoofer Black SWS-10D2
ALPINE SWT-S10 1200w 10" Car Audio Subwoofer in Bass Tube Enclosure 4-Ohm Sub 793276242303 | eBay