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ROCKFORD FOSGATE

ROCKFORD FOSGATE Power 400 Watt Class-ad 4-Channel Amplifier

$399.99 USD
T400X4ad

The Power T400X4ad is an ultra-compact, high efficiency 400 Watt 4-channel amplifier. Features multi-impedance Constant Power, input/output clip detection, top mounted controls and dual fan forced induction cooling. Perfect for hybrid, electric, small cars, trucks, motorcycles, and side-by-side UTVs.

The Power T400X4ad 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
  • 2 Year Warranty
CEA-2006 Compliant
CEA-2006 Compliant

Power ratings on Rockford Fosgate amplifiers conform to CEA-2006 industry standards. These guidelines mean your amplifier's ...

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CEA-2006 Compliant
CEA-2006 Compliant

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

Class AD
Class AD

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

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Class AD
Class AD

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

CE Compliant
CE Compliant

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

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CE Compliant
CE Compliant

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

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

Patented circuit with in/out clip LEDs to help match a source to amp and optimize output.

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

Patented circuit with in/out clip LEDs to help match a source to amp and optimize output.

Constant Power
Constant Power

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

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Constant Power
Constant Power

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

3-Stage Airflow
3-Stage Airflow

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

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3-Stage Airflow
3-Stage Airflow

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

DSM
DSM

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

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DSM
DSM

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

Engineered In The USA
Engineered In The USA

These Avatars are a personal signature from the Rockford Fosgate team member(s) who designed and engineered ...

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Engineered In The USA
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.

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
Signal Output
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
Remote Controls
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
Heatsink
Operating Voltage
9 - 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
Dimensional Diagram
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.)