Alpine 12 Inch Type-R Subwoofer (R-W12D2) | SK Customs Car Audio & Home Theater | Atlanta | Norcross | Duluth | John's Creek
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Subwoofer Box Alpine Type R SWR-1242D | Ported Box | Slot
Alpine Type R 12' SWR1243D Subwoofer | eBay
Alpine Type S SWS-12D4 12 Inch 1500 Watt Max 4 Ohm Round Car Audio Subwoofer - Walmart.com
Alpine SWR-1221D 12" Dual 2-ohm Voice Coil Subwoofer 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