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The Rockford Fosgate Power 400 Watt 4-Channel Amplifier is widely praised for clean, dynamic sound, strong bass impact and robust build quality, with flexible tuning useful for bi-amping and active setups.
Buyer confidence
88%Highlights
- 2-Year Warranty
- 24dB/octave crossover
- MOSFET power supply
- 2/4 channel input switch
Key specs
Full specs- Number of Channels
- 4
- Total Power (Sum of Rated Power)
- 400 Watts RMS
- Rated Power (RMS Continuous Power)
- 60 Watts x 4 @ 4-Ohm 100 Watts x 4 @ 2-Ohm 200 Watts x 2 @ 4-Ohm Bridged 2-Ohm x 2 Bridged Stable
- Dynamic Power (PVC/PowerCube®)
- 84 Watts x 4 @ 4-Ohm 0° Res 139 Watts x 4 @ 2-Ohm 0° Res 272 Watts x 2 @ 4-Ohm Bridged
- Bridgeable
- Yes
- Frequency Response
- 20Hz to 20kHz +/- 1dB
- Input Sensitivity
- 150 mV to 4 V
- Circuit Topology Class
- Class A/B
Key specs
Full specs- Number of Channels
- 4
- Total Power (Sum of Rated Power)
- 400 Watts RMS
- Rated Power (RMS Continuous Power)
- 60 Watts x 4 @ 4-Ohm 100 Watts x 4 @ 2-Ohm 200 Watts x 2 @ 4-Ohm Bridged 2-Ohm x 2 Bridged Stable
- Dynamic Power (PVC/PowerCube®)
- 84 Watts x 4 @ 4-Ohm 0° Res 139 Watts x 4 @ 2-Ohm 0° Res 272 Watts x 2 @ 4-Ohm Bridged
Highlights
Overview- 2-Year Warranty
- 24dB/octave crossover
- MOSFET power supply
Review highlights
Based on customer reviewsRockford Fosgate Power 400 Watt 4-Channel Amplifier — clean, punchy power in a solid package
The Rockford Fosgate Power 400 Watt 4-Channel Amplifier is widely praised for clean, dynamic sound, strong bass impact and robust build quality, with flexible tuning useful for bi-amping and active setups.
What buyers praise
- Clean, clear sound with strong bass and good dynamics
- Robust, heavy construction and solid input/output connections
What to watch for
- Power-hungry — several owners note it needs proper wiring and may benefit from a power condenser
Overview
The Power T400-4 is a compact 4-channel car amplifier rated for 100 Watts into each channel at 2-Ohms. It supports 4-way full-range systems or front component speakers with rear subwoofers and features Dynamic Thermal Management for reliable operation in tight installations.
Best for
- 4-way full-range car audio systems
- Front component speakers with rear subwoofer(s)
- Front/rear fading stereo setups
- Installations requiring a small chassis (under-seat or tight locations)
Key points
- 4 channels, 100 Watts into each channel at 2-Ohms
- Flexible for full-range or mixed speaker/subwoofer configurations
- Dynamic Thermal Management (DTM) for heat control in compact installs
- Includes technologies: TRANS•ana, Punch EQ2, MEHSA3, NOMAD, TO-247 MOSFETs, CTA-2006 compliance, DSM
Fit and use
Use as a dedicated 4-channel amp for separate front and rear outputs. Configure for a 4-way full-range layout or front components with rear subs as described. Small chassis allows placement under seats or other confined spaces—confirm physical space before installation. Match speaker impedance and power handling to the amplifier's 2‑Ohm rating for best results.
What to know
Power ratings are specified at 2-Ohms; confirm speaker impedance and continuous power handling before pairing. Dynamic Thermal Management helps manage temperature in tight installs but allow some ventilation around the amplifier. This overview summarizes core features and typical uses; consult the product documentatio…
Highlights
Key features
- 2-Year Warranty
- 24dB/octave crossover
- MOSFET power supply
- 2/4 channel input switch
- 4 Gauge power/ground connectors
- Audiophile grade speaker connections
- MOSFET output stage
- TRANS•ana
- Punch EQ2
- MEHSA3
- DTM
- NOMAD
More info
Manufacturer details
The Power T400-4 is a 4-channel amplifier capable of producing 100 Watts into each of its four channels at 2-Ohms. The T400-4 can run a 4-way full-range system or use component speakers on the front with subwoofers on the rear.
Additional details
The T400-4 amplifier is perfect for front/rear fading stereo systems or when dedicated amplification is required between front stage speakers and rear subwoofer(s). Thanks to the Dynamic Thermal Management, the small chassis design insures it can be installed in any location – like under front seats.
Technologies
TRANS•ana
An award winning studio quality circuit borrowed from the pro audio company Hafler. TRANS-ana is a sound quality
Punch EQ2
In the early 70's, Jim Fosgate studied the acoustical properties of automobiles. Utilizing a real-time analyzer
MEHSA3
MEHSA3 reduces MOSFET temperatures, lowers distortion, increases durability and prolongs the output device life
DTM
Our engineers at Rockford Fosgate have developed an award winning cooling design called DTM (Dynamic Thermal
NOMAD
NOMAD is a "real time" analog computer that protects your amplifier from shorting speaker wires and ...
TO-247 MOSFETs
The MOSFET transistor is the best type of device to use when building a high quality mobile amplifier. The Power
CTA-2006 Compliant
Power ratings on Rockford Fosgate amplifiers conform to CTA-2006 industry standards. These guidelines mean your
DSM
DSM - An industry-leading manufacturing process, DSM utilizes high-speed robotics, high-quality 1% tight-tolerance
Engineered In The USA
[av• uh•tahr -noun] 1. an embodiment or personification, as of a principle, attitude, or view of life 2. a
Showing the main technologies for this product.
Specs
Specifications
28
| Number of Channels | 4 |
| Total Power (Sum of Rated Power) | 400 Watts RMS |
| Rated Power (RMS Continuous Power) | 60 Watts x 4 @ 4-Ohm 100 Watts x 4 @ 2-Ohm 200 Watts x 2 @ 4-Ohm Bridged 2-Ohm x 2 Bridged Stable |
| Dynamic Power (PVC/PowerCube®) | 84 Watts x 4 @ 4-Ohm 0° Res 139 Watts x 4 @ 2-Ohm 0° Res 272 Watts x 2 @ 4-Ohm Bridged |
| Bridgeable | Yes |
| Frequency Response | 20Hz to 20kHz +/- 1dB |
| Input Sensitivity | 150 mV to 4 V |
| Circuit Topology Class | Class A/B |
| Efficiency (average) | 69% @ 4-Ohm 68% @ 2-Ohm |
| Total Harmonic Distortion (THD+Noise) | 4-Ohm: <1.0% 2-Ohm: <1.0% |
| Signal Input | Front Low level: 1 RCA pair Rear Low level: 1 RCA pair Input Switch: 2CH / 4CH |
| Signal Output | n/a |
| Tone Controls | Front Channels - Punch EQ Treble: 0dB to +12dB @ 12kHz Bass: 0dB to +18dB @ 45Hz Rear Channels - Punch EQ Treble: 0dB to +12dB @ 12kHz Bass: 0dB to +18dB @ 45Hz |
| Crossover Controls | Front High-Pass (HP): 50-500Hz 24dB/octave Butterworth Front Low-Pass (LP): 50-500Hz 24dB/octave Butterworth Rear High-Pass (HP): 50-500Hz 24dB/octave Butterworth Rear Low-Pass (LP): 50-500Hz 24dB/octave Butterworth |
| Remote Controls | Optional Remote Punch EQ (overrides rear channel built-in Punch EQ) |
| Visual Indicators | Power Thermal Protect |
| Power Wire Gauge | 8 AWG to 4 AWG |
| Power Input Connector | Block |
| Speaker Wire Gauge | 8 AWG to 18 AWG |
| Speaker Output Connector | Screw terminal barrier strip |
| Cooling | Convection |
| Operating Voltage | 9 - 16 VDC |
| Recommended Fuse (not included) | 60 A |
| Average Current Draw (13.8V Music) | 30 A |
| Max. Current Draw (13.8V Sinewave) | 60 A |
| Suggested Alternator | 75 A |
| Dimensions (H x W x D) | 2.14 x 8.14 x 13.66 (in) 5.42 x 20.68 x 34.69 (cm) |
| Shipping Weight | 11.90 Lbs. (5.39 Kg.) |
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Installation resources
Wiring diagrams
10
Wiring Diagram #1
Source: Rockford Fosgate
Wiring Diagram #2
Source: Rockford Fosgate
Wiring Diagram #3
Source: Rockford Fosgate
Wiring Diagram #4
Source: Rockford Fosgate
Wiring Diagram #5
Source: Rockford Fosgate
Wiring Diagram #6
Source: Rockford Fosgate
Wiring Diagram #7
Source: Rockford Fosgate
Wiring Diagram #8
Source: Rockford Fosgate
Wiring Diagram #9
Source: Rockford Fosgate
Support
Return Authorization
If you bought this product from Onkar Electronics, use the Contact Us page on the Onkar Electronics website and we will help with return authorization and warranty support. If you purchased it from another dealer, contact that authorized dealer first for return assistance.
Popular Questions
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