Universal Down Firing High-End Custom Hand Crafted Subwoofer Enclosure – Sounds Good Stereo Online
Alphasonik AS12DF 12" Down Fire Shallow Mount Flat Enclosure | Alphasonik
Amazon.com: Atrend Dual Vented 12 Inch Down Firing Subwoofer Enclosure with Universal Fit - Dual Car Subwoofer Boxes & Enclosures - Made in USA Subwoofer Box Improves Audio Quality, Sound & Bass : Electronics
QPower QBFORD122009DF Sealed Down-Firing Subwoofer Enclosure for 2009 - 2017 Ford F-150 SuperCrew Truck - ( Black Bed-Liner )
8" Subwoofer Install - Ported Downward Firing DIY Enclosure | 2016+ Honda Civic Forum (10th Gen) - Type R Forum, Si Forum - CivicX.com
Kicker Down Firing Shallow Mount 10" Subwoofer Box | P.C. Richard & Son
LAB PreFab™ 1.65 ft^3 Sealed Downfire MDF Enclosure Box for Single 15" Round Car Subwoofer