Kenwood P-XW1002B 10" Subwoofer with Sealed Down-Firing Enclosure-P-XW1002B Shop 4k, HDTV's, Car Audio, Home Theater in Roseburg, OR 97470
Air-Bus Wireless 8 In. Down-Firing Subwoofer, 110W
Kicker 48TRTP102 TRTP 10-inch Thin Down Firing Subwoofer and Passive Radiator Enclosure, 2-Ohm - Creative Audio
Subwoofer, BESTISAN Powered Subwoofer, Home Theater Deep Bass Subwoofer, Down Firing Sub in Compact Size, Easy Setup with Home Theater System, TV, Receiver, Speakers (RCA Cable Included, Black),SW65C : Electronics
Down-Firing Subwoofer - Placement and Orientation | AV Gadgets
Pioneer 8" Shallow Subwoofer Downfiring Enclosure-UD-SW200D | Lincoln Lectronics
Down-Firing vs Front-Firing Subwoofers | Klipsch
KICKER TRTP 10-inch (25cm) Thin Down Firing Subwoofer and Passive Radiator Enclosure, 2-Ohm, RoHS Compliant : Electronics
DIY Down Firing Port Active Subwoofer - YouTube
Amazon.com: KICKER TRTP 8-inch (20cm) Thin Down Firing Subwoofer and Passive Radiator Enclosure, 2-Ohm, RoHS Compliant : Electronics
How to make Down Firing Powered Subwoofer - DIY Build - YouTube
Pioneer UD-SW300D Single down-firing sealed enclosure for 12" shallow sub at Crutchfield
Down Firing vs Front Firing Subwoofer | REL
Amazon.com: Architech 8" 100-Watt Down-Firing Subwoofer with Wireless Receiver, Black (AB-800) : Electronics
TDX 8-Inch Down Firing Powered Subwoofer Home Theater Surround Sound Black 8" 6956745144193 | eBay
Front- and down-firing subwoofers -- Teufel Audio blog