Kicker 48CDF124 (2) Comp 12" Subwoofer in Down Firing enclosure with CXA800 amplifier and wire kit - Walmart.com
Three exciting car subwoofer options
Kenwood Excelon P-XW1241S Ported enclosure with one 12" 4-ohm subwoofer at Crutchfield
Kicker CompRT Truck vs. Kicker CompRT Downfiring Subwoofer
Pioneer UD-SW300D Single down-firing sealed enclosure for 12" shallow sub at Crutchfield
Amazon.com: KICKER TRTP 12-inch (30cm) Thin Down Firing Subwoofer and Passive Radiator Enclosure, 2-Ohm, RoHS Compliant : Electronics
KICKER COMPRT10" Down-Firing Enclosure - AudioWorks of Delaware | Turn It On! | Car Alarms - Remote Starters - Audio Systems - Navigation Systems - Multimedia Systems - Custom Car Rims & Tires - On-site Company Fleet Services
Amazon.com: Kicker 47TRTP122 Car Audio Down Firing 12" Thin Sub Box Passive Radiator Bundle with Harmony HA-A400.1 Amplifier & Amp Kit : Electronics
Kicker® Down-Firing 8" CompRT Car Speaker Loaded Enclosure | Audio Express | Western United States