<p>The Power TM400X4ad 400 Watt 4-channel ultra-compact, amplifier is built on Rockford Fosgate’s proprietary Class-AD technology, featuring Constant Power to produce the same output at both 4-Ohm and 2-Ohm impedances. Flexible vehicle integration enabled through low-level and high-level inputs with auto turn-on. Top mounted controls allow easy access to built-in crossover and C.L.E.A.N. input/output clip detection circuits. The 3-stage thermal lock extrusion with dual fan forced induction keeps everything cool while real-time thermal/protection schemes safeguard the amplifier.</p><h2>Power Marine 400 Watt Class-Ad 4-Channel Amplifier Features:</h2><ul><li>Rockford Fosgate proprietary Class AD technology</li><li>Differential inputs with high level auto turn-on feature</li><li>8 AWG power/ground connector w/ upgraded RCA connectors</li><li>Remote-Out feature when using high level inputs</li><li>4/2 Ohm muti-impedance Constant Power</li><li>2/4 channel input switch</li><li>Top mounted controls</li><li>C.L.E.A.N. input/output clip detection and indicator LEDs</li><li>4 Ohm bridged capable</li><li>Dual fan cooled</li><li>Real time thermal sensing</li><li>Discrete surface mount technology</li><li>Dual extruded heat sinks</li><li>Marine grade two part epoxy coating on circuit boards</li></ul><h2>Specifications</h2><ul><li>Number of Channels- 4</li><li>Total Power(Sum of Rated Power)- 400 Watts</li><li>Rated Power (RMS Continuous Power) - 100 Watts x 4 @ 4-Ohm, 100 Watts x 4 @ 2-Ohm, 200 Watts x 2 @ 4-Ohm Bridged</li><li>Dynamic Power (PVC/PowerCube®)- 128 Watts x 4 @ 4-Ohm, 152 Watts x 4 @ 2-Ohm, 290 Watts x 2 @ 4-Ohm Bridged</li><li>Bridgeable- Yes Front Terminals: Left (+) Right (-), Rear Terminals: Left (+) Right (-)</li><li>Frequency Response- 20Hz-20kHz +/-1dB</li><li>Input Sensitivity- 150 mV to 12 V</li><li>Circuit Topology Class- Class AD</li><li>Efficiency (average)- &gt;75%</li><li>Signal Input- Front High/Low Level Input: 4-Pin harness, Rear High/Low Level Input: 4-Pin harness</li><li>Power Wire Gauge- 8 AWG</li><li>Operating Voltage9 - 16 VDC</li><li>Recommended Fuse (not included)- 60 A</li><li>Average Current Draw (13.8V Music)- 28 A</li><li>Max. Current Draw (13.8V Sinewave)- 55 A</li><li>Suggested Alternator- 75 A</li></ul><h2>Class-AD</h2><p>This technology allows the amplifier to produce more power with less current draw from the vehicle's charging system.</p>