The CompRT Down-Firing Subwoofer Enclosures come loaded with a passive reFLEX subwoofer and KICKER CompRT active subwoofers. The patented design of the TRTP was created in-house by KICKER engineers. The new benchmark in ultra-thin, pre-loaded enclosures, the TRTP’s unique shape and beefy construction are the perfect combination of convenience and reliability. Place the TRTP under your truck seat or cargo area for great bass – no grille needed! Covered in stylish black carpeting and built with thick MDF, these tough enclosures take serious power without taking up needed space. Heat is the enemy of endurance. To make our subs even more reliable, KICKER engineers developed Forced-Air Cooling to help our CompRT subs run 25 percent cooler. RoHS Compliant.