UD-SW100D - Downfiring Enclosure for 10" Shallow Subwoofer | Pioneer Electronics USA
PS-DF110T 10" Downfiring Enclosure
Amazon.com: Pyle 8'' Active Down Firing Subwoofer - Home Theater Surround Sound Black w/Sealed Design, Magnetic Design w/Sleek Black Color, Down Firing Port for Deeper Bass Resonance - PSUB8A : Musical Instruments