Amazon.com: Alphasonik AS12DF 12" 1500 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 :
SUONEX Acústica - CAJÓN ACÚSTICO PARA PIONEER TS-W310D4 - YouTube
Armando cajón porteado para Subwoofers Pioneer Champions Pro TW-3003D4 | EBAC - YouTube
Pioneer A-Series Shallow-Mount Pre-Loaded Enclosure (12-Inch Subwoofer) in the Mobile Audio department at Lowes.com