Mini Bandpass Enclosure Series - Full Build Plans and Demo! - YouTube
Pyle Plqb10 10 Inch 500 Watt Max Power Vehicle Car Audio Speaker Subwoofer Bandpass Enclosure Box System With Plexiglass Front Window Panel, Black : Target
Polk MM1240DVC In a ABTEC Custom 4th Order Band-Pass Enclosure – Abtec Audio Lounge Blog
Q-Logic QB-110.3 Single 10" bandpass subwoofer box at Crutchfield
10" Single Bandpass Sub Box Subwoofer Enclosure Single Ported Vented Sub Box | eBay
Source 12" Vented Box Bandpass Subwoofer Box Woofer Car Audio Box on m.alibaba.com