Alpine X-W12D4 X-Series 12" subwoofer with dual 4-ohm voice coils at Crutchfield
Alpine Type X 12 subwoofer VS wallsocket 120 volts - YouTube
Alpine Type X 12“ inch Subwoofer with Super Bass ProBox Enclosure for Sale in Denton, TX - OfferUp
Amazon.com: Alpine Bundle Compatible with Universal Car X-W12D4 Type X 12" Loaded SPL Bass Subwoofer Labyrinth Vent Sub Box Stereo Enclosure : Electronics
User manual Alpine X-W12D4 (English - 13 pages)
Alpine type x 10 inch sub. - Subwoofers & Enclosures - Weeki Wachee, Florida | Facebook Marketplace | Facebook
Custom Alpine Type X 12" SWX-1243D Subwoofer System, Qty 2 (4 speakers) | eBay
Amazon.com: Alpine ALP19-R-W12D4 Car Audio Type R Series Sub Dual 4 Ohm 1500W Peak 12" Subwoofer : Electronics
Amazon.com: Alpine (2) X-W10D4 Car Audio Type X Series Sub 1800W Peak 10" Subwoofer Bundle with Harmony HA-A1500.1 Amplifier & Amp Kit : Electronics