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Power 400 Watt Class-ad 4-Channel Amplifier

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

Number of Channels

Total Power

(Sum of Rated Power)

Rated Power

(RMS Continuous Power)

Dynamic Power



Frequency Response

Input Sensitivity

Circuit Topology Class

Efficiency (average)

Total Harmonic Distortion (THD+Noise)

Signal Input

Signal Output

Tone Controls

Crossover Controls


CEA-2006 Power Rating

100W x 4 @ 4Ω

≤1.0% THD+N

400 Watts

100 Watts x 4 @ 4-Ohm

100 Watts x 4 @ 2-Ohm

200 Watts x 2 @ 4-Ohm Bridged

128 Watts x 4 @ 4-Ohm

152 Watts x 4 @ 2-Ohm

290 Watts x 2 @ 4-Ohm Bridged


Front Terminals: Left (+) Right (-)

Rear Terminals: Left (+) Right (-)

20Hz - 20kHz +/-1dB

150 mV to 12 V

Class AD


4-Ohm: <1.0%

2-Ohm: <1.0%

Front High/Low Level Input: 4-Pin harness

Rear High/Low Level Input: 4-Pin harness


Treble: 0 to +14 dB @ 12.5 kHz

Bass: 0 to +18 dB @ 45 Hz


50Hz-250Hz @ 12dB/Octave Butterworth


50Hz-250Hz @ 12dB/Octave Butterworth

All-Pass: Yes

Remote Controls

Visual Indicators

Power Wire Gauge

Power Input Connector

Speaker Wire Gauge

Speaker Output Connector



Operating Voltage

Recommended Fuse

(not included)

Average Current Draw

(13.8V Music)

Dimensions (H x W x D)

Shipping Weight

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


3RED: 10%+ THD


Detachable Compression Terminal

16 AWG

Detachable Compression Terminal

Dual Fan Cooled


9 - 16 VDC

60 A

55 A

4,1 x 10,8 x 21,1 cm

1,54 kg