Finished my down-firing subwoofer enclosure for two 10's | Subwoofer enclosure, Subwoofer, Car audio
Three exciting car subwoofer options
KICKER TRTP102 | Kompaktes Down-Firing Subwoofer-System mit 25 cm (10') Subwoofer und Passiv-Reflex-Radiator, geschlossen : Amazon.de: Elektronik & Foto
12 " Zoll Aktiv Portierte Gehäuse Subwoofer Dose 1500w Design Zu Für Alle Auto | eBay
Alphasonik ASDF 10" Down Fire Shallow Mount Flat Enclosur | Alphasonik
Universal Down Firing High-End Custom Hand Crafted Subwoofer Enclosure – Sounds Good Stereo Online
Front- and down-firing subwoofers -- Teufel Audio blog