JBL Stage 1220B 1000W Dual 12" Subwoofer Enclosure | Best Jeep Wrangler JK 4 Door Subwoofer Box | American SoundBar
GT-12BP | 12" (300mm) car audio bandpass subwoofer box
JBL S2-1224 Car subwoofer passive 1100 W | Conrad.com
Check out new work on my @Behance portfolio: "JBL cutaway speaker" http://be.net/gallery/31939991/JBL-cutaway-speaker | Audio design, Subwoofer box design, Jbl