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Rockford Fosgate T400-4 400 Watt 4-Channel Amplifier

Brand: Rockford Fosgate
Model Number: T400-4
UPC: 780687324469
Rockford Fosgate
Model Number: T400-4
UPC: 780687324469

Rockford Fosgate T400-4 400 Watt 4-Channel Amplifier

  • 24dB/octave crossover
  • MOSFET output stage
  • 4 Gauge power/ground connectors
  • MOSFET power supply
  • 2/4 channel input switch
  • Audiophile grade speaker connections

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Product Description

Features & Specifications



Rockford Fosgate T400-4 400 Watt 4-Channel Amplifier

T400-4 Power performance

The Rockford Fosgate T400-4 amplifier puts out 60 watts RMS into each of its four channels — more than enough to drive your front and rear speakers to their musical peaks. Or you can bridge your T400-4 to blast 200 watts each to a pair of subwoofers. Either way, you can depend on clean, powerful sound from your Power Series amp.

Dynamic Thermal Management

Rockford Fosgate T400-4 Power Series amp use Rockford Fosgate’s patented, award-winning “Dynamic Thermal Management,” a 3-stage cooling system that uses forced air to dissipate heat evenly across the amp and out through the large heatsinks. This results in cooler internal components, higher efficiency, and lower distortion.

MEHSA cooling process

MEHSA is a Rockford Fosgate proprietary process that increases the heat transfer from the MOSFET devices to the heatsink. This allows the heat to escape more readily from the amplifier, so that the transistors stay cooler.

Extra-quiet inputs

Rockford Fosgate T400-4 differential Input circuitry helps eliminate any electronically induced noise or hum that could be picked up by the input cables, allowing only clean signals to enter the amplifier. You get more music with less heat and noise in a stylish package that’s up to 40% smaller than previous models.

Cast Aluminum Heatsink

The cast aluminum heatsink dissipates heat generated by the amplifier’s circuitry. The inherent advantage of casting provides a 30% improvement of cooling over conventional extrusion heatsink designs.


The Power Rockford Fosgate T400-4 utilizes ultra high performance MOSFET output devices, giving the amplifier more power handling capability as well as lower thermal impedance for more reliable operation, even under the harshest load conditions.

Power and Protection LEDs

The LEDs are located on top of the amplifier. A blue Power LED illuminates when the amplifier is turned on. A red Thermal LED illuminates if the amplifier overheats. The yellow Protect LED illuminates if a short circuit or too low an impedance is detected at the speaker connections. When any of the protection circuits engage, the amp automatically shuts down until the problem is corrected.

Wiring Diagram #1

Rockford Fosgate T400-4


Wiring Diagram #2

Rockford Fosgate T400-4


Wiring Diagram #3

Rockford Fosgate


Wiring Diagram #4

Rockford Fosgate


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Wiring Diagram #9



Wiring Diagram #10

Brand Rockford Fosgate   Model Rockford Fosgate T400-4
Product: Rockford Fosgate T400-4 400 Watt 4-Channel Amplifier

RMS Power Output (Watts x Channels) 60 x 4
Peak Power Output (Watts x Channels) N/A
Power at 2 Ohms (Watts x Channels) 100 x 4
Bridged Power (Watts x Channels) 200 x 2
Minimum Impedance Bridged 4
Minimum Impedance Unbridged 2
Minimum Impedance 2
Best Frequency Response 20-20k Hz
THD at Rated RMS Power 0.1%
Signal to Noise Ratio 85 dB
Input Voltage 14.4v


Amplifier Class AB
Low-Pass Crossover Frequency 50-500 Hz
Low-Pass Slope (dB/octave) 24 dB/oct
High-Pass Crossover Frequency 50-500 Hz
High-Pass Slope (dB/octave) 24 dB/oct
Bass Boost 0-18 dB
Bass Boost Frequency 45 Hz
Fan Cooled No
Fuse Rating 100
Speaker Level Inputs No
Preamp Outputs No
Width (inches) 13-5/8
Height (inches) 2-1/4
Depth (inches) 9-5/8

Mobile Amplifier Channels

4 Channel

Mobile Amplifier Class

Class AB

Mobile Amplifier Features

Bass Boost, High-Pass Filter, Low-Pass Filter

Mobile Amplifier Fuse Rating


Mobile Amplifier RMS

351 to 750 watts

Mobile Min Impedance


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Rockford Fosgate offers a 2 year limited warranty


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