Amazon.com: Universal Car Stereo Slotted S Port Single 12" Alpine R-W12D4 Type R Car Audio Subwoofer Custom Sub Box Enclosure Package New : Electronics
Universal Car Stereo Vented Enclosure Single 12" Alpine R2-W12D4 Type – absoluteusa
Universal Car Stereo Slotted S Port Single 10" Alpine Bundle Type R R-W10D4 Sub Box Enclosure with Harmony HA-A800.1 Amplifier & 4GA Amp Kit - Walmart.com
Alpine Audio 10" Type R & Type X Custom Aero Ported Box X-W10D4 R-W10D4 R-W10D2 | eBay
Alpine type R 12 inch in ported box - electronics - by owner - sale
2) Alpine Type-R R2-W12D4 12" 750w RMS Car Subwoofers+Vented Sub Box Enclosure - Rockville Audio
Box build for 2-12" Alpine Type-R subs - YouTube
Box I built a couple months back. Alpine type R 10” 1.5cf at 33hz : r/CarAV
Alpine Type R 12" sub in ported box install - YouTube
Alpine R2-SB12V Single Type R2 12-in Subwoofer in Vented Enclosure - Creative Audio
Alpine SBR-S12D4 Type-R 12" Subwoofer Enclosure - Signature Car Sound
Alpine 12” Type R-Series Powered Ported Bass Package Includes one Alpine R-W12D4 12” subwoofer, R-A75M amplifier, and 2.25 ft³ optimized ported enclosure
Custom Ported Subwoofer Box Enclosure for 2 12" Alpine Type R Subs - R-Series | eBay
Alpine SWR-12D2 3000 Watt Type R Car Subwoofer + Vented Sub Enclosure Box | Audio Savings
Bass Package: Dual 12" Type-R Series Subwoofers w/ Ported Enclosure
Alpine 8" Type R Single Enclosure | P.C. Richard & Son
Alpine SBR-S8-4 Ported enclosure with one 8" Type-R subwoofer at Crutchfield
Alpine 8" Type R Single Enclosure | P.C. Richard & Son
Sealed / Recessed Sub Box for (2 12") Alpine Type R Subs - Subwoofer Enclosure | eBay