2 Used Alpine type-S 10 Subwoofers in custom Trapezoid Box SWS-1042D | eBay
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Alpine SWS-10D4 Type-S 10 Subwoofer
Customer Reviews: Alpine SWS-1023D Type-S 10" subwoofer with dual 2-ohm voice coils at Crutchfield
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
Stereowise Plus: Alpine Type-S SWS-10D4 10 Inch Subwoofer Review