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Air-Bus Wireless 8 In. Down-Firing Subwoofer, 110W
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
Down Firing vs. Front Firing Subwoofer - Blog - REL
PS-ADF110T 10" Amplified Downfiring Enclosure
KICKER CompRT Down-Firing 8” Dual-Voice-Coil 2-Ohm Loaded Subwoofer Enclosure Black 48TRTP82 - Best Buy
LAB PreFab™ 0.48 ft^3 Sealed Downfire MDF Enclosure Box for Single 12" Round Car Subwoofer
Kicker 49PTRTP12 Compact down-firing 500-watt powered enclosure with CompRT® 12" shallow-mount subwoofer and passive radiator at Crutchfield
Downfiring sub, how much space underneath? | Page 2 | diyAudio
Amazon.com: KICKER TRTP 12-inch (30cm) Thin Down Firing Subwoofer and Passive Radiator Enclosure, 2-Ohm, RoHS Compliant : Electronics