Kicker 49TRTP12 Car Audio 12 Powered Down Firing Loaded Enclosure 2-Ohm 500 Watts. The PTRTP combines an active, award-winning CompRT subwoofer, a passive reFLEX sub, and a power-matched, built-in amplifier for an efficient, pounding bass solution for your ride. Hard-Hitting Bass in a Single Package. Compact, factory-tuned enclosure for tight locations to fit many trucks and SUVs. Two models available - 12-inch sub with 500-watt amp, or a 10-inch sub with 400-watt amp.
Amp is built-in and power-matched for hard-hitting bass. Easily integrates with factory system. Down-firing for ultimate driver protection. Thick, tough internal bracing to resist stacking weight. Active CompRT Sub matched with passive reFLEXT sub for extra output. RMS POWER (watts at 14.4v). S-TO-N RATIO (A-weighted, re: rated power). Low Level - 125mV-5V; High Level - 1V-40V. Active 12dB/octave, variable 50-120Hz low pass; 12dB/octave, high pass at 25Hz. Variable to +6dB, centered at 40Hz.