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
Kicker Comp RT 12" Down Firing Subwoofer Kit with Box: TRTP112-SK
DS18 EN-DF10 10" Shallow Down Firing Subwoofer Enclosure 600 Watts – Droppin HZ Car Audio
HOW DOES IT SOUND? - Downfiring Subwoofer Build Finished! - YouTube