Best Buy: R&T Enterprises 12" Single Bandpass Subwoofer Box BB-1200
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12" Bandpass Sub Box / 12" Dual Ported Subwoofer Enclosure Vented Sub Box 2 12" | eBay
Pyle - PLBWS212 - On the Road - Subwoofer Enclosures
Pyramid Bnps122 12 Inch 1200 Watt Dual Audio Subwoofer With Neon Lighting And Bandpass Enclosure Box And Pyramid Pb715x 2-channel Car Audio Amplifier : Target
Sound Ordnance™ B-17 Bandpass enclosure with 12" subwoofer at Crutchfield
Sound Ordnance™ B-24 Bandpass enclosure with two 12" subwoofers at Crutchfield