Rockford Fosgate
400W RMS 4-Channel Marine Amplifier

Rockford Fosgate TM400X4ad
Rockford Fosgate TM400X4ad Rockford Fosgate TM400X4ad Rockford Fosgate TM400X4ad Rockford Fosgate TM400X4ad Rockford Fosgate TM400X4ad Rockford Fosgate TM400X4ad Rockford Fosgate TM400X4ad Rockford Fosgate TM400X4ad


The TM400X4ad is a powerful and compact 400 Watt 4-channel amplifier. The amplifier features our proprietary high efficiency Class-ad topology for maximum power, sound quality and efficiency in full-range amplifier. It also integrates our patented Constant Power technology which results in up to 25% more output power. Top mounted controls feature our patented C.L.E.A.N. circuit to easily set your gains, integrated low-pass crossover, and our famous Punch EQ.

The amplifier also features high and low level inputs combined with our differential inputs to eliminate incoming noise. It can also provide a remote-out trigger when using high level inputs. Dual fan cooling, real time thermal monitoring and dual extruded heat sinks maintain heat dissipation even at high outputs keep the amp cool.

In addition to the conformal coated pc boards, the Element Ready™ design ads protection against water, dust and UV rays, making it great for multiple applications where it could be exposed to harsh outdoor environment.

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.

  • 8 AWG Power/Ground Connector with Upgraded RCA Connectors
  • Rockford Fosgate Proprietary Class AD Technology
  • Differential Inputs with High Level Auto Turn-on Feature
  • Remote-Out Feature when Using High Level Inputs
  • C.L.E.A.N. Input/Output Clip Detection and Indicator LEDs
  • Top Mounted Controls
  • 4/2 Ohm Muti-impedance Constant Power
  • 2/4 Channel Input Switch
  • Discrete Surface Mount Technology
  • Dual Extruded Heat Sinks
  • Real Time Thermal Sensing
  • Dual Fan Cooled
  • 4 Ohm Bridged Capable
  • Marine Grade Two Part Epoxy Coating on Circuit Boards
  • 2-Year Warranty

CE Compliant

This product fulfills all essential safety and environmental requirements as defined in the European Directives (768/2008 EC).

CTA-2006 Compliant

Power ratings on Rockford Fosgate amplifiers conform to CTA-2006 industry standards. These guidelines mean your amplifier's output power ratings are REAL POWER numbers, not inflated marketing ratings.


This technology allows the amplifier to produce more power with less current draw from the vehicle's charging system.

Constant Power

Constant Power is a patented circuit topology that provides instantaneous delivery of output power over varying impedance loads.

C.L.E.A.N. Set-Up

C.L.E.A.N. (Calibrated Level Eliminates Audible Noise) is a patented circuit with in/out clip LEDs to help match a source to amp and optimize output.

Element Ready™

All components are protected against harsh outdoor elements like Dust, UV, Temperature, Water, Corrosion & Vibration.

3-Stage Airflow

3-stage airflow method effectively exhausts heat and ensures your amplifier runs cooler for optimum performance.

Engineered in the USA

These Avatars are a personal signature from the Rockford Fosgate team member(s) who designed and engineered this fanatic product. This statement illustrates our commitment to being Designed and Engineered in the U.S.A.


DSM utilize 1% tight-tolerances improving efficiency of the circuit, decreases cross-talk from other discrete components and lowers operating temperature.


400W RMS
100W x 4 @ 4Ω
100W x 4 @ 2Ω
200W x 2 @ 4Ω Bridged
Dynamic Power
128W x 4 @ 4Ω
152W x 4 @ 2Ω
290W x 2 @ 4Ω Bridged
Front Terminals: Left (+) Right (-)
Rear Terminals: Left (+) Right (-)
Frequency Response
20Hz - 20kHz +/-1dB
Input Sensitivity
150 mV to 12 V
4Ω < 1%
2Ω < 1%
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
Power Wire Gauge
Power Input Connector
Detachable Compression Terminal
Speaker Wire Gauge
16 AWG
Speaker Output Connector
Front: 4-Pin Harness
Rear: 4-Pin Harness
Dual Fan Cooled
Extruded Aluminum
Operating Voltage
9 - 16 VDC
Recommended Fuse
60 A
Average Current Draw
28 A
Max Current Draw
55 A
Suggested Alternator
75 A
1.6 x 4.3 x 8.3"
410 x 108 x 211 mm
3.4 lbs (1.54 kg)
More Information
Brand Rockford Fosgate
Amplifier Class Class AD
RMS Power 400W RMS