Amazon.com: Alpine Bundle Compatible with Universal Car X-W12D4 Type X 12" Loaded SPL Bass Subwoofer Labyrinth Vent Sub Box Stereo Enclosure : Electronics
Amazon.com: Universal Car Stereo Paintable Ported 10" Alpine X-W10D4 Type X Car Audio Subwoofer Custom Sub Box Enclosure Package New : Electronics
12" Alpine Type X Sub & Carbon Fiber Box for Sale in Los Angeles, CA - OfferUp
Amazon.com: Alpine X-W10D4 Car Audio Type X Series Sub 1800W Peak 10" Subwoofer Bundle with Harmony HA-A800.1 Amplifier & Amp Kit : Electronics
Custom Ported Sub Box Enclosure for 1 12" Alpine Type X Subwoofer ~ X-Series | eBay
Alpine X-W12D4 X-Series 12" subwoofer with dual 4-ohm voice coils at Crutchfield
User manual Alpine X-W12D4 (English - 13 pages)
Alpine SWX-1043D Type-X 10" subwoofer with dual 4-ohm voice coils at Crutchfield