https://supremesounds.com/collections/amplifiers-1/products/rockford-fosgate-t400-4-4-channel-amplifier Description 4-channel car amplifier 60 watts RMS x 4 at 4 ohms (100 watts RMS x 4 at 2 ohms) 200 watts RMS x 2 bridged output at 4 ohms CEA-2006 compliant Dynamic Thermal Management cooling system Differential Input circuitry eliminates hum variable high- and low-pass filters (50-500 Hz, 24 dB/octave) variable bass/treble boost (0-18 dB at 45 Hz, 0-12 dB at 12k Hz) optional remote bass/treble boost (available soon) Class-AB amplifier design MOSFET power and output stages preamp inputs 4-gauge power and ground leads and a 100-amp fuse recommended — wiring and hardware not included with amplifier no on-board fuses — when installing multiple amps in a system, an additional 100-amp in-line fuse between the distribution block and the amplifier is recommended 13-5/8"W x 2-1/4"H x 9-5/8"D The T400-4 amplifier is perfect for front/rear fading stereo systems or when dedicated amplification is required between front stage speakers and rear subwoofer(s). Thanks to the Dynamic Thermal Management, the small chassis design insures it can be installed in any location – like under front seats.