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HOW DOES IT SOUND? - Downfiring Subwoofer Build Finished! - YouTube
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Down-Firing Subwoofer - Placement and Orientation | AV Gadgets
Down-Firing vs Front-Firing Subwoofers | Klipsch
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Front- and down-firing subwoofers -- Teufel Audio blog
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GMC Sonoma Extended Cab Sub Box GMC Sonoma Extended Cab Subwoofer
UnderSeat Downfire Dual 12" Subwoofer Sub Box for 2000-2003 Ford F150 Xcab
