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Rockford Fosgate Power T400-4

400W Power Series Compact 4-Channel Amplifier

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List price $429.99

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$349.99

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  • Power Series 4-Channel Class AB Car Amplifier
  • RMS Power Rating:
    • 4 ohms: 60 watts x 4 chan.
    • 2 ohms: 100 watts x 4 chan.
    • Bridged, 4 ohms: 200 watts x 2 chan.
  • Max power output: 400 watts x 1 chan.
  • MOSFET Power Supply
  • Built-in NOMAD is a "real time" analog computer that protects your amplifier from shorting speaker wires and dangerously low speaker impedances
  • Built-in differential inputs eliminates noise picked up the signal cable
  • Remote bass level input (remote level control sold separately)
  • LED power, thermal, and protection indicators
  • Tuned Bass EQ (0-12 dB bass boost at 45 Hz)
  • Audiophile grade speaker connections
  • Infrasonic filter
  • Front and Rear RCA Inputs
  • Built-in cast aluminum convection cooling evenly distributes excess heat across entire amplifier heatsink
  • Variable low-pass filter (50-500 Hz, 24 dB/octave)
  • Variable high-pass filter (50-500 Hz, 24 dB/octave)
  • CEA-2006 compliant amplifier
  • Frequency response: 20-25000 Hz
  • Dimensions: 13.66" L x 8.14" W x 2.14" H
  • 4-gauge power and ground leads recommended. Contact us for information regarding a discount on a select amplifier kit when purchased together.

Power Specifications - Full Range Channels

RMS Power @ 4 ohms

The RMS power rating is the measure of continuous power that an amplifier can output, or a speaker can handle. It is the most accurate depiction of real, continuous power that the industry has so far.

If the final impedance of your speakers or subwoofers equals 4 ohms, this is how much power this amplifier will supply at that ohm level. The higher the RMS wattage, the more clean and loud your music will sound.

60 watts x 4 channels
RMS Power @ 2 ohms

The RMS power rating is the measure of continuous power that an amplifier can output, or a speaker can handle. It is the most accurate depiction of real, continuous power that the industry has so far.

If the final impedance of your speakers or subwoofers equals 2 ohms, this is how much power this amplifier will supply at that ohm level. The higher the RMS wattage, the more clean and loud your music will sound.

100 watts x 4 channels
Bridged RMS Power

Bridging refers to combining two channels on an amplifier to create one channel with double the voltage and an increased power output. A 2-channel amplifier will bridge down to 1-channel and a 4-channel amplifier can bridge to create 2-channels. An amplifier is most commonly bridged to drive a subwoofer.

Remember, once you bridge two channels down to one its final impedance will be 4 ohms unless otherwise specified. This rating lists the RMS power created once an amplifier is bridged.

200 watts x 2 channels
Peak Power Output
This form of power rating refers to the maximum amount of power an electronic device can handle or output in an instant without damage occurring. Often times this maximum is achieved during a brief musical burst, such as a drum accent, or low bass hit.

Some manufacturers display peak power ratings on the face of their products to increase the appeal to consumers. The RMS power rating is more accurate, and we recommend using it for product comparison.

400 watts x 1 channels

Amplifier Specifications

Amplifier Series
This designates the series of the amplifier. Many amps are available in a litany of different wattage and channel configurations, but maintain consistent features throughout the product line.
Power (Rockford Fosgate)
Amplifier Class

An amplifier increases the power of the signal being fed to it by taking energy from its power supply and matching the signal but increasing its amplitude. Amplifiers use many different methods for converting these electrical signals and have been categorized into classes.

Class A/B: Greater than 50% of the input signal is amplified while the other percentage is “off”. These amplifiers have a small amount of current flowing through the output transistors all the time which almost eliminates crossover distortion. Class A/B has great sound quality but is not as efficient as class D. These amps are most commonly used to drive speakers.

Class D: Also known as switching amplifiers, class D amps have output transistors that are completely turned “on” or “off”. This means that when the transistors are on, there is almost no voltage across them but when they are off there is significant voltage but no current flowing through it which makes these amplifiers very efficient at the cost of sound quality. These amps are most commonly used to drive subwoofers.

Other Classes: You may see classes such as GH, bD, X, FD, etc. by some manufactures. These amplifiers tend to be either class A/B, D or a hybrid of the two but with improvements to their designs that can make them more efficient or offer better sound quality.

AB
Number of Channels
Each channel on an amplifier will power one speaker using a positive and negative cable. There are various types of amplifiers, each designed to power a certain number of speakers. Monoblock amplifiers, also known as single channel, are designed to power one or more subwoofers. These amplifiers often have very high power ratings. On the other hand, multi-channel amplifiers power multiple speakers, usually at lower power ratings. 2-Channel and 4-Channel amplifiers can power car speakers or low powered subwoofers. Occasionally you might see a 5 or 6-channel amplifier that can power speakers and subwoofers at the same time. The most common setup is a monoblock amp to run subwoofers and a 4-channel amp to run door speakers. Check out our Knowledge Base for more information.
4
Total RMS Power Output
Total RMS power is measured by multiplying RMS power per channel by the number of channels, and is calculated at the lowest level of operating impedance.

RMS power is the amount of continuous power, measured in watts, that an amplifier produces is called RMS power. The higher the RMS figure, the louder and cleaner your music sounds.

The RMS output figure is much more accurate than the peak rating when comparing products.

400 watts
Maximum Input Gauge Size
This is the largest gauge wire that will fit into the power and ground terminals of this device. The lower the gauge number, the thicker the wire is. For example, a 4 gauge wire is thicker than an 8 gauge wire and thus has higher current carrying capacity. Always do your best to get this size wire to reduce the risk of damage to your components.
4 AWG
Minimum Impedance Unbridged
The lowest impedance the amplifier will handle when it is not bridged.
2 ohms
Minimum Impedance Bridged
The lowest impedance the amplifier will handle when it is bridged.
4 ohms
THD at Rated RMS Power
The amount of change in harmonic content of the signal as it is amplified. A lower figure indicates less change and a more accurate amp. THD below 0.10% is inaudible.
.5%
Speaker Level Inputs
Speaker level inputs are commonly referred to as high-level inputs and vice versa. This input type allows you to get your audio signal directly from the speaker wire in your vehicle, instead of using RCA cables. The advantage of this is factory integration, as most stock radios do not have RCA outputs to run amplifiers.
No
Preamp Outputs
Many amplifiers are equipped with RCA preamp outputs which pass the original music signal from the source to additional amplifiers. This is known as daisy chaining because the source connects to the first amp, and the first amp connects to the second amp, etc. The advantage to daisy chaining is you only need one 2-channel RCA cable to transfer the signal from the head-unit to the amplifier, and then one additional cable for each amp being daisy chained.
No
Built-in Crossover

A crossover is a type of filtering system that permits only certain frequencies to play. A Low-Pass (LP) crossover allows only frequencies below its setting to get through which is good in the case of some subwoofers. A High-Pass(HP) filter allows frequencies above its setting to pass through, this is normally used on speakers.

When a crossover is set to FULL it means no filtering is added and the full frequency spectrum is allowed through the amplifier. Filtering is important because feeding a speaker frequencies it cannot reproduce effectively creates distortion.

Low-pass (LP)
High-pass (HP)
Full (AP)
High-Pass Crossover Frequency
The high-pass crossover frequency can be a fixed crossover point or a variable crossover range. A variable high-pass crossover allows you to select a specific crossover point which allows frequencies above the set crossover point to pass, while making frequencies below the set point gently or harshly roll-off, depending on the steepness of the slope.

The steepness of the roll-off slope is measured in dB/octave and refers to the rate of attenuation (lowering of volume) outside their pass bands.

50 - 500 Hz
Low-Pass Crossover Frequency
The low-pass crossover frequency is typically used for subwoofers. It can be a fixed crossover point or a variable crossover range. A variable low-pass crossover allows you to select a specific crossover point which allows frequencies below the set crossover point to pass, while making frequencies above the set point gently or harshly roll-off, depending on the steepness of the slope.

The steepness of the roll-off slope is measured in dB/octave and refers to the rate of attenuation (lowering of volume) outside their pass bands.

50 - 500 Hz
Signal-to-Noise Ratio
This spec compares the strength of the signal to the level of background noise. A higher value indicates less background noise.
85 dB
Bass Boost
The objective of the bass boost is to get more kick out of your subwoofer. It is a circuit that emphasizes the lower frequencies at a given point. The bass boost should always be set first before setting the gain. This feature is known for destroying subwoofers and is commonly used incorrectly, so be cautious.
0 - 18 dB
Bass/Gain Remote
If the amp comes with a bass/gain remote you will be able to control the level of your bass from your dashboard. Typically bass remotes also include a 16-20 ft. wire for installation.
Optional (Accessory required and sold separately)
Fan Cooled
A great feature to have if an amp generates a large amount of heat. Cooling fans can help regulate the temperature to prevent the amp from overheating (burning).
Dynamic Thermal Management
CEA-2006 Compliant
Amplifiers that have been tested to meet specific standards. When a car amplifier meets these standards, you can be sure that it will be able to produce the amount of power specified by the official CEA-2006 rating. Usually, these rating consist of the following items:
  • RMS Power
  • Signal-to-Noise Ratio

This rating applies to both external car amplifiers, as well as the amplifiers inside of in-dash stereos.

Yes
Sonic Certified Amplifier
Sonic Certified amplifiers have been tested by the experts at Sonic Electronix to meet or exceed the wattage ratings provided by the manufacturer. If this is marked as Yes, then you can trust the wattage ratings. If marked as No, then we have tested the amplifier and it did not meet the advertised wattage ratings. If marked as Not Tested, then the Sonic Electronix experts have not yet been able to test the amp.

Warranty and Return Policy

Parts Warranty Duration
2 years
Labor Warranty Duration
2 years
Warranty Provider
Sonic Electronix

Summary of Customer Ratings & Reviews

Rating Distribution

5 Star
82%
4 Star
18%
3 Star
0%
2 Star
0%
1 Star
0%

Average Attribution Rating

Durability
4.8
Value
4.8
Features
4.7
Design
4.8
Usability
4.7
Local disturbance

Marshall, MN

Overall
Durability
Value
Features
Design
Usability
WOW, very good performance

November 30, 2011

Origionaly intended to use the amp for my components but I ran out of money for toys so I am now stuck using this amp to power 2 Dayton Audio 15" reference subs temporarily. The subs are severely underpowered however they still sound fantastic. The birth sheet that came with the amp rated it at 'nearly' 500 watts RMS. Even when driving the amp at its peak output the distortion is minimal (would still not recommend it though). The only problem I have at all with this amp is that Punch EQ 18db adjust knob (only bass control knob that is compatable) can only adjust the rear channels. Not a big deal, I wouldnt use it anyway if it was on the components. The heat dispersion plate works well but if you have it in your trunk with no air circulation it will still overheat after about an hour IF running near full power.

For my ratings,

Value - was a 5 because Sonic Electronix has some of the best prices I can find from a higher end online dealer and I paid less for this amp than I would have for 400 RMS watt at walmart (not sure if walmart even knows that they are supposed to rate an amp at RMS not peak)

Look/design - 5 because I like simple asthetics, I dont need a bunch of flashy lights to show off since the only people that care about that are usually the people that dont know anything when it comes to stats and what the thing is for. I would rather show it off to people for its sound quality

Durability - 5 because I run it as close to full power as I can without getting distortion and it has no problem.

Features - 4 only because you cannot control all channels using the Punch EQ knob. They do make a bass control knob that will do that however it is not compatible with the Power series.

Ease of use - 5... plug and play (maybe adjust the gain and boost level a little bit but it sounded great right from the factory.

6 of 6 found this helpful

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MHubbard

Buena Park, CA

Overall
Durability
Value
Features
Design
Usability
Rockford Fosgate T400-4

February 5, 2010

This amplifier continues in the long line of quality products from Rockford Fosgate. With the proper adjusting of the crossovers and gains this amplifier is definitely sound quality oriented. I have this in both of my vehicles pushing components and my midbass and highs never sounded better. I highly recommend this amplifier to anyone considering the T400-4 as an option to run their mids and highs. I rate this amplifier an A++. I have been using this amplifier for over a year.

3 of 3 found this helpful

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Yon

Phoenix, AZ

Overall
Durability
Value
Features
Design
Usability
Amazing power output

March 25, 2010

Received my amp yesterday and I'm using 4 channel 4ohm output for components. The birth sheet has the power output at 85 whats x 4 @ 4ohm. That's amazing. Sounds great hooked up to my front and rear door type-R components. I couldn't be happier with my purchase. Sonic had this product at my doorstep the next day after ordering.

2 of 2 found this helpful

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Quincy

Pooler, GA

Overall
Durability
Value
Features
Design
Usability
Soooo much power

February 25, 2010

I bought this amp to power my 4 6.5" door speakers and power them it does. Each speaker is rated at 50 watts RMS at 4 Ohms and I have to turn the gain on the amp way down to keep the speakers from blowing out of the door. The birth sheet shows significantly higher power ratings than is advertised for as well. In my opinion you cannot go wrong with this amp at all.

2 of 2 found this helpful

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Paul

Kent, WA

Overall
Durability
Value
Features
Design
Usability
Great Amp!

February 4, 2008

This amp pushes extremely clean power to all 4 channels. I'm running Diamond S600s in the front and Beyma W6 in the rear for mid bass. This amp makes this speaker setup sound excellent. The highs are perfect and the lows are tight and hit hard. I definitely recommend this amp to anyone!

2 of 2 found this helpful

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John

Pensacola, FL

Overall
Durability
Value
Features
Design
Usability
POWER

December 3, 2013

What more can be said about RF amps,they're way underrated unlike most other cheaper amps, I have mine powering 3 pairs of tweets and about to be adding maybe 2 more pairs on it. This amp is worth every penny. You get what you pay for.

0 of 0 found this helpful

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david

san antonio, TX

Overall
Durability
Value
Features
Design
Usability
The best has returned

September 22, 2013

I have been a stereo fanatic for many years and have had plenty of different type of amps. I had heard a lot about them changing ( for the better) so I gave them a try again so very glad I did cause Fosgate is BACK and better than ever. I love this amp and have it hooked up to focal speakers 6.3/4 in front and 6x9's in the rear in my 01 Monte Carlo SS and believe me it's loud (1500 watts total with subs) and crystal clear and I'm loving it! If you want a great amp consider Fosgate again cause there back.

0 of 0 found this helpful

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Jpf 6110

Billings mt

Overall
Durability
Value
Features
Design
Usability
Rockford t400

September 12, 2013

I have the T400 powering my focal 6.5 poly glass, it helps them scream to my satisfaction. I have no problem with the amp getting hot or handling my finger going to the volume .

0 of 0 found this helpful

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Francisco

Sacramento, CA

Overall
Durability
Value
Features
Design
Usability
Great Amp!

June 27, 2013

Great amp for the price.
Pros:
-554 rms total output.
-83 watts per chan at 4 ohms and enough to handle front and rear speakers. (pioneer component front, rear pioneer 6x9)
-Very great design and durability seems to be very good and rigid.

Con's: - No cons at the moment because amp is functioning as it should be. Will give update review in another year.

0 of 0 found this helpful

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Braden

Canada

Overall
Durability
Value
Features
Design
Usability
This amp is great!

May 23, 2013

Clarity and quality are both achieved with this high end audiophile amplifier. Well done Rockford Fosgate. This a perfect 4 channel amp for amy mobile audio enthusiast.

0 of 0 found this helpful

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Crazy32

Conroe TX

Overall
Durability
Value
Features
Design
Usability
Crisp amp with good power

May 28, 2012

I purchased this amp to push two pairs of component speakers. The amp provides good power and has worked flawlessly so far for 6 months.

0 of 0 found this helpful

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JOSCELYN

Canada

Overall
Durability
Value
Features
Design
Usability
T400-4

April 11, 2012

If you want more for your money, get this amp. Rockford Fosgate gives you more than you need, but why not!

0 of 0 found this helpful

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Big Dog

Devils Lake, ND

Overall
Durability
Value
Features
Design
Usability
Rockford Fosgate 400-4 (Black Box) Amp

January 31, 2012

This is very nice! Is nice for visible installations and has plenty of power for your speakers!

0 of 0 found this helpful

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dale

dubberly, LA

Overall
Durability
Value
Features
Design
Usability
Fosgate Quality!

January 10, 2012

As with every piece of R/F equipment I have ever purchased this one does not disappoint. Looks great, performs flawlessly and has never overheated even after extended trips with the system blaring at its fullest setting. I have it running my door and rear quarter speakers. (also R/F) I would have no reservations in recommending this amp to anyone who is looking for quality, value and overall cosmetic appeal. Way to go R/F! Way to go SONICELECTRONIX, you rock.

0 of 0 found this helpful

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Tone

Philadelphia

Overall
Durability
Value
Features
Design
Usability
Great for the long run

November 28, 2011

Its a great amp.... got them all hooked up on 4' 6.5" speakers but it has one small flaw. It has that burning smell coming from the amp. Did some research online its mostly dust collection and other small stuff. Had it for about 5 month now and its still kicking.

0 of 0 found this helpful

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canuck jay

Lynnwood, Wa.

Overall
Durability
Value
Features
Design
Usability
Beauty and a Beast!

October 14, 2011

This excellent amp is running my main deck and 4 JL audio C3 component speakers effortlessly. No problems whatsoever, runs cool even after hours of playing. I have it mounted under passenger front seat, which is a shame because it looks too good to be hidden! Only rated it 4 star for now because I've only had it under a year, but I won't be surprised if it outlast me!

0 of 0 found this helpful

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dominic

Roswell, NM

Overall
Durability
Value
Features
Design
Usability
im in love!

August 23, 2011

As soon as i hooked this amp up to my component sets and they are amazing great power! i had my speakers hooked up to a 4 channel 600 watt sony xplod amp and there is no comparison.

0 of 0 found this helpful

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HINO

Anchorage AK

Overall
Durability
Value
Features
Design
Usability
love it

August 8, 2011

Have this hooked up to 4 alpine type r components/coaxial speakers. Love this amp but now i gotta upgrade on subs.

0 of 0 found this helpful

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David

spring valley, CA

Overall
Durability
Value
Features
Design
Usability
Rockford Fosgate T400-4, T500-1bd

March 9, 2011

Simply awesome. I've built a lot of systems in my time. I never got it right. They always disappointed me. This time I matched all the components up and the system is incredible. This system was combined with 2 12's and 8 6x9's in a boat. I have no more than $2,500 into the system, but when I crank the system up, it is crystal clear, and has the tightest bass I've ever heard. I can be sitting right next to a guy with $15,000 into his system, and mine just blows it away. No one believes mine cost less than $20,000 when they hear it. Simply amazing with these Rockford Fosgate amps.

0 of 0 found this helpful

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M&M

New Orleans, LA

Overall
Durability
Value
Features
Design
Usability
Good amp for highs.

February 18, 2011

Once I installed it and tweaked it, I never had to touch it, clear crisp highs. I would reccomend this amp.

0 of 0 found this helpful

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Accessory Tools and Products

Accessories added

NVX XKIT44 4-Gauge 4-Channel Wiring Kit

4-Channel 100% OFC Complete True 4 Gauge Amp Kit with RCA Cables and Speaker Wire

Your Price $99.99

Rockford Fosgate RFK4 4-Gauge Wiring Kit

Get a matching Fosgate wiring kit for your new Fosgate amplifier! Don't forget the RCA's!

Your Price $62.99

NVX XBG3PK 1/0 Gauge OFC Big 3 Upgrade Kit

Comes with everything you need to upgrade your power and ground wire.

Your Price $59.99

Kicker Big 3 Package 1/0 Gauge Big 3 Upgrade Kit

Get all you need including wire cutters to upgrade your power and ground wire.

Your Price $151.99

Belva BBG3KT CCA 1/0 Gauge Big Three Kit

Features everything needed to upgrade factory power and ground wire.

Your Price $39.99

JL Audio HD-RLC

Remote Level Control for Select JL Audio Amplifiers

Your Price $29.99

StreetWires FB4

4 AWG / 4 Gauge Firewall Bushing

Your Price $6.95

NVX XDBU4 - Top of the Line!

Distribution Block with Two 1/0 or 4 AWG Inputs and Four 4 or 8 AWG Outputs

Your Price $17.99

NVX XIV45 4-Channel RCA Audio Interconnect Cable

5 Meters (16.4 ft.) 4-Channel RCA Audio Interconnect Cable with Dual Twisted Pair Hyper-Flex Technology

Your Price $23.99

NVX XIX45 X-Series RCA Interconnect Cable

16.4 ft. of 4-Channel X-Series RCA Cable with Dual Twisted Pair Hyper-Flex Technology

Your Price $34.99

StreetWires ZN9 Series Interconnect Cable

16.4 ft. of 4-Channel RCA Cable with Rhodium-plated contacts and ZeroNoise construction for clear signal transfer!

Your Price $99.95

Kicker 4-Channel RCA Audio Interconnect Cable

4 Meters (13 ft.) 4-Channel K-Series RCA Audio Interconnect Cable

Your Price $19.95

NVX XWS1225 12 AWG Speaker Wire

25 ft. of True 12 Gauge 100% Copper EnvyFlex Speaker Cable/Wire

Your Price $39.99

NVX XWS1250 Speaker Wire

50 ft. of True 12 Gauge 100% Copper EnvyFlex Speaker Cable/Wire

Your Price $29.99

NVX XWS1625 16 AWG Speaker Wire

25 ft. of True 16 Gauge 100% Copper EnvyFlex Speaker Cable/Wire

Your Price $13.99

Belva BBSW127 12 AWG Speaker Wire

12 Gauge 7 Meter (23 Ft) Speaker Wire (CCA)

Your Price $14.99

Belva BBSW167 16 AWG Speaker Wire

16 Gauge 7 Meter (23 Ft) Speaker Wire (CCA)

Your Price $12.99

The Install Bay IB-CAP1F

True 1.0 Farad Car Audio Capacitor for up to 1000W Max

Your Price $37.99

e2 ECAP1 by Scosche - Mid-Level 1 Farad

Digital 1.0 Farad Car Audio Capacitor for up to 1000W Max

Your Price $49.99

Rockford Fosgate RFC1D - Top of the Line 1 Farad

Digital 1.0 Farad Car Audio Capacitor for up to 1000W Max

Your Price $99.99

SMD DD-1 Distortion Detector

Set the gain of an audio amplifier quickly and accurately

Your Price $149.99

Scosche SPL Meter SPL1000F

Handheld boomSTICK measures your SPL range from 60 to 135 dB

Your Price $21.99

XIX2025 Strapping RCA

0.25 Meter (0.86 ft) Hyper-Flex RCA cable w/ Serpentine-Cut Nickel Plated Connectors

Your Price $12.99

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Product Summary

Manufacturer

Model Number

T400-4

UPC

780687324469

Weight

13.00lbs

Internal SKU

t400-4

Internal Product ID

9102

Sonic Electronix Wiring Guide

Wiring Diagram Legend

Warning: The image depicted shows the resistance change when wiring multiple subwoofer terminals. Please refer to your subwoofer's owner's manual for the proper wiring of its terminals. Sonic Electronix, Inc. is not responsible for damage caused to your audio system or vehicle due to improper installation. Please call tech support at 1-877-289-7664 if you require additional assistance.

Product Name: Rockford Fosgate Power T400-4