Custom Ported/Vented Sub Box Subwoofer Enclosure for 1 15" Alpine Type R Subwoofer - 3.1 CF - 32HZ : Electronics - Amazon.com
FS: Alpine Type R 15" Subwoofer (1542 dual 4ohm) - Car Parts - PakWheels Forums
Custom Ported Sub Enclosure Box for a 15" Alpine Type R SWR-15 ~ 1/2" PLEXIGLASS | eBay
2) Alpine SWR-8D4 8" 1000w Dual 4 Ohm Car Subwoofer+Sealed Sub Enclosure Box - Rockville Audio
Need help with Box Dimensions for a Single Sealed Enclosure for an Alpine 15" Type R Subwoofer. Have supplies to build it. Will be in the backseat of an Extended Cab 1994