Rockford Fosgate T400X4ad Power 400 Watt Compact 4-Channel Amplifier

Brand: Rockford Fosgate
Model Number: T400X4AD
UPC: 780687342388
Model Number: T400X4AD
UPC: 780687342388
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Rockford Fosgate T400X4ad Power 400 Watt Compact 4-Channel Amplifier

  • Class AD amplifier design
  • Constant Power technology maintains full output power despite impedance changes
  • Dual-fan forced induction cooling
  • Variable high- and low-pass filters (50-250 Hz, 12 dB/octave)
  • Variable Punch EQ (bass/treble boost: 0-18 dB at 45 Hz, 0-14 dB at 12,500 Hz)

Product Description

Features & Specifications



Rockford Fosgate T400X4ad Power 400 Watt Compact 4-Channel Amplifier

The Power T400X4ad is a 400 Watt 4-channel ultra-compact amplifier with high efficiency. Multi-impedance Constant Power, input/output clip detection, top-mounted controls, and dual fan forced induction cooling are just a few of the features. Perfect for small cars, trucks, motorcycles, and side-by-side UTVs that are hybrid or electric.

Built on Rockford Fosgate’s proprietary Class-AD technology, the Power T400X4ad 400 Watt 4-channel ultra-compact amplifier features Constant Power to produce the same output at both 4-Ohm and 2-Ohm impedances. Low-level and high-level inputs with auto turn-on enable flexible vehicle integration. Built-in crossover and C.L.E.A.N. input/output clip detection circuits are easily accessible via top-mounted controls. The 3-stage thermal lock extrusion with dual fan forced induction keeps everything cool, and the amplifier is protected by real-time thermal/protection schemes.

Super-compact and packed with power

The Rockford Fosgate Power Series T400X4ad 4-channel amplifier can deliver up to 100 watts RMS to four separate speakers, or you can use it to power two 200-watt subwoofers. This tough little amp is kept cool by a dual-fan forced air cooling system, so it can play hard for a long time.

Class AD is precise and powerful.

To create this ultra-efficient, high-output amplifier, Rockford Fosgate employs their proprietary Class AD amplifier technology, which combines the high fidelity of a Class A system with the high efficiency of their special Class D technology. In other words, compared to most other amps on the market today, this compact amp produces more power with less current draw from your vehicle’s charging system.

The high-tech solutions from Rockford Fosgate provide more power.

Using Rockford Fosgate’s Constant Power technology, the Power Series amplifiers actively monitor speaker performance. The impedance of a speaker varies naturally as it performs, competing with the output of your amplifier. Constant Power maintains this amp’s output by increasing its internal voltage and current flow when the speaker’s impedance rises, similar to how cruise control increases the engine’s RPM to maintain your car’s speed uphill. The amp’s total power output can increase by up to 25% as a result of this.

Easy to set for optimum performance

Rockford Fosgate’s C.L.E.A.N. technology (Calibrated Level Eliminates Audible Noise) setup system ensures your music will sound as clean and powerful as possible. It works like this: first download the setup tones from Rockford Fosgate, then play the tone, adjust the receiver volume until a red clip light on the amp goes out, then turn the amp gain up until a blue light comes on. It’s that simple — your amplifier will be perfectly set to match your receiver’s output. When your receiver reaches maximum clean volume, you’ll get maximum clean power from your Power amp. At quiet listening levels, you’ll hear less background noise and more of your music.

Clip lights

If that blue light turns solid red while you’re playing music, the amp’s telling you that your source is distorting and you should turn it down, or risk damage to your gear. The optional PLC2 remote level control also doubles as a clip indicator, so you can see from the front seat if your music’s clipping.

T400X4ad Features at a Glance

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

Available Wiring Diagrams

Please consult your amplifier owner’s manual for lowest recommended impedance.

The below diagrams optimize this amp for its lowest recommended BRIDGED/MONO load.

Wiring Diagram #1

Wiring Diagram #2

Wiring Diagram #3

Wiring Diagram #4

Wiring Diagram #5

Wiring Diagram #6

Wiring Diagram #7

Wiring Diagram #8

Wiring Diagram #9

Wiring Diagram #10

Brand Rockford Fosgate   Model Rockford Fosgate T400X4AD
Product: Rockford Fosgate T400X4ad Power 400 Watt Compact 4-Channel Amplifier

Cta-2006 Compliant
Number of Channels: 4
Total Power: 400 Watts
Rated Power: 100 Watts x 4 @ 4-Ohm, 100 Watts x 4 @ 2-Ohm, 200 Watts x 2 @ 4-Ohm Bridged
Dynamic Power: 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
3RED: 10%+ THD

Power Wire Gaug: e8 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: Extruded Aluminum
Operating Voltage: 9 – 16 VDC
Recommended Fuse: 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.)


Amplifier Class: A/D
Low-Pass Crossover Frequency: 50-250 Hz
Low-Pass Slope (dB/octave): 12 dB/octave
High-Pass Crossover Frequency: 50-250 Hz
High-Pass Slope (dB/octave): 12 dB/octave
Bass Boost: 0-18 dB
Bass Boost Frequency: 45 Hz
Fan Cooled: Yes
Fuse Rating: 60
Speaker Level Inputs: Yes
Preamp Outputs: No
Width (inches): 8-5/8
Height (inches): 1-5/8
Depth (inches): 4-5/16

What's in the box

Rockford Fosgate Power T400X4ad owner's manual
Four-channel amplifier
Two 14" Input harnesses (4-pin Molex connector to 2 female RCAs)
Two 8" Speaker output harness (4-pin Molex connector to bare wire)
Amplifier Quick Setup sheet
Certificate of Performance Verification

Mobile Amplifier Channels

4 Channel

Mobile Amplifier Class

Class AD

Mobile Amplifier Features

Bass Boost, High-Pass Filter, Low-Pass Filter, Speaker Level Inputs

Mobile Amplifier Fuse Rating


Mobile Amplifier RMS

351 to 750 watts

Mobile Min Impedance


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Rockford Fosgate 2 Year Limited Warranty


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