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Rockford Fosgate TM400X4ad Power Marine 400 Watt Class-ad 4-Channel Amplifier

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SKU: TM400X4ad
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3 in stock

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Designed for Motorsport and Marine Applications


The TM400X4ad is a 400 Watt 4-channel amplifier with high efficiency Class-ad technology and a conformal coated pc board designed for motorsport and marine applications.


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.


  • Rockford Fosgate proprietary Class AD technology
  • 4/2 Ohm muti-impedance Constant Power
  • Differential inputs with high level auto turn-on feature
  • 8 AWG power/ground connector w/ upgraded RCA connectors
  • Remote-Out feature when using high level inputs
  • 2/4 channel input switch
  • 4 Ohm bridged capable
  • C.L.E.A.N. input/output clip detection and indicator LEDs
  • Top mounted controls
  • Dual fan cooled
  • Real time thermal sensing
  • Dual extruded heat sinks
  • Discrete surface mount technology
  • Marine grade two part epoxy coating on circuit boards


  • CEA-2006 Compliant
  • CEA-2006 Power Rating 100W x 4 @ 4Ω, ≤1.0% THD+N
  • Number of Channels 4
  • Total Power (Sum of Rated Power) 400 Watts
  • Rated Power (RMS Continuous Power) 100 Watts x 4 @ 4-Ohm, 100 Watts x 4 @ 2-Ohm, 200 Watts x 2 @ 4-Ohm Bridged
  • Dynamic Power (PVC/PowerCube®) 128 Watts x 4 @ 4-Ohm, 152 Watts x 4 @ 2-Ohm, 290 Watts x 2 @ 4-Ohm Bridged
  • Bridgeable Yes, Front Terminals: Left (+) Right (-), Rear Terminals: Left (+) Right (-)
  • Frequency Response 20Hz-20kHz +/-1dB
  • Input Sensitivity 150 mV to 12 V
  • Circuit Topology Class Class AD
  • Efficiency (average) >75%
  • Total Harmonic Distortion (THD+Noise) 4-Ohm: <1.0%, 2-Ohm: <1.0%
  • Signal Input Front High/Low Level Input: 4-Pin harness, Rear High/Low Level Input: 4-Pin harness
  • Tone Controls Treble: 0 to +14 dB @ 12.5 kHz, Bass: 0 to +18 dB @ 45 Hz
  • Crossover Controls High-Pass: 50Hz-250Hz @ 12dB/Octave Butterworth / Low-Pass: 50Hz-250Hz @ 12dB/Octave Butterworth / All-Pass: Yes
  • Visual Indicators Power: Blue LED, Protect: Red LED, Input Clip: Red LED3, Output Clip: Blue/Violet/Red LED1,2,3 / LED Color Legend: 1BLUE: <0.5% THD, 2VIOLET: 1% THD, 3RED: 10%+ THD
  • Power Wire Gauge 8 AWG
  • Power Input Connector Detachable Compression Terminal
  • Speaker Wire Gauge 16 AWG
  • Speaker Output Connector Front: 4-Pin Harness, Rear: 4-Pin Harness
  • Cooling Dual Fan Cooled
  • Operating Voltage9 – 16 VDC
  • Recommended Fuse (not included) 60 A
  • Average Current Draw (13.8V Music) 28 A
  • Max. Current Draw (13.8V Sinewave) 55 A
  • Suggested Alternator 75 A
  • Dimensions (H x W x D) 1.6 x 4.3 x 8.3 (in.) 4.1 x 10.8 x 21.1 (cm)
  • Shipping Weight 3.4 lbs. (1.54 Kg.)

Rockford Fosgate TM400X4ad Specs

Weight 1.54 kg

Rockford Fosgate: Revolutionizing Audio in Automotive, Marine, and Motorcycle Industries

Rockford Fosgate, an iconic American brand, has carved a niche in the audio industry, particularly in automotive, marine, and motorcycle sectors. Known for their robust and high-quality audio products, Rockford Fosgate continues to innovate and provide exceptional sound systems that cater to audiophiles and enthusiasts who demand superior sound quality and durability in challenging environments.

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