MartinLogan Dynamo™ 1600X Powered subwoofer, wireless adapter optional at Crutchfield
Subwoofer – Wikipedia
Amazon.com: ALPHASONIK AS10DF 10 inch 1200 Watts 4-Ohm Down Fire Shallow Mount Flat Enclosed Sub woofer for Tight Spaces in Cars and Trucks, Slim Thin Loaded Subwoofer Air Tight Sealed Bass Enclosure :
Shallow Mount, Single Sealed – Atrend USA
Teufel T10 Subwoofer 150W Front- oder Downfire in Bayern - Ochsenfurt | Lautsprecher & Kopfhörer gebraucht kaufen | eBay Kleinanzeigen
Q-Power Single 12-Inch Universal Downfire/Behind Seat Sub Box (2 Pack) - Walmart.com
Atrend® A152-12cp Bbox Series Subwoofer Box For Gm Vehicles (12" Dual Downfire) - Walmart.com
Ultima 40 Kombo Power Edition | Teufel audio, Stereo lautsprecher, Stereoanlagen
Front- and down-firing subwoofers -- Teufel Audio blog
Down- oder Frontfire-Subwoofer: Welches Gerät passt zu mir? – Subwoofer im Test
Down-firing vs front-firing? Sub placement? | AVS Forum
Front- und Downfire Subwoofer vorgestellt | Teufel Blog