UD-SW100D - Downfiring Enclosure for 10" Shallow Subwoofer | Pioneer Electronics USA
KICKER COMPRT10" Down-Firing Enclosure - AudioWorks of Delaware | Turn It On! | Car Alarms - Remote Starters - Audio Systems - Navigation Systems - Multimedia Systems - Custom Car Rims & Tires - On-site Company Fleet Services
HOW DOES IT SOUND? - Downfiring Subwoofer Build Finished! - YouTube
KICKER 48CDF124 Comp12 12" 300w Down Firing Car Subwoofer in Sub Box Enclosure 713034020332 | eBay
Universal Down Firing High-End Custom Hand Crafted Subwoofer Enclosure – Sounds Good Stereo Online