Alpine SBR-S8-4, Compact R Series Loaded 8" Subwoofer Enclosure System – AVLeaderz
Alpine R-SB10V Halo Series 10" linkable ported subwoofer enclosure at Crutchfield
Bass Package: Dual 12" Type-R Series Subwoofers w/ Ported Enclosure
Alpine Two R2-SB12V Next-Gen 12" R-Series Halo Loaded Sub Enclosures with KTX-H12 Link Kit - Creative Audio
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
Universal Car Stereo Vented Enclosure Single 12" Alpine R2-W12D4 Type – absoluteusa
Subwoofer Box Alpine Type R SWR-1242D | Ported Box | Slot
Custom Sub Enclosure | Affordable Sub Box
2) Alpine Type-R R-W12D2 12" 750w RMS Car Subwoofers+Vented Sub Box Enclosure - Walmart.com
Alpine SBR-S8-4 Ported enclosure with one 8" Type-R subwoofer at Crutchfield