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Rockford Fosgate Power T400-2

400W RMS Power Series Compact 2-Channel Amplifier

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List price $499.99

$369.99

with warranty

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  • Power Series Compact 2-Channel Amplifier
  • RMS Power Output:
    • 4 ohms: 120 watts x 2 channels
    • 2 ohms: 240 watts x 2 channels
    • Bridged, 4 ohms: 400 watts x 1 channels
  • CEA-2006 compliant
  • Dynamic Thermal Management cooling system
  • Differential Input circuitry eliminates hum
  • Variable high- and low-pass filters (50-500 Hz, 24 dB/octave)
  • Variable bass/treble boost (0-18 dB at 45 Hz, 0-12 dB at 12k Hz)
  • Optional remote bass/treble boost
  • Class AB amplifier design
  • MOSFET power and output stages
  • Preamp inputs and outputs
  • 4-gauge power and ground leads and a 100-amp fuse recommended — wiring and hardware not included with amplifier
  • No on-board fuses — when installing multiple amps in a system, an additional 100-amp in-line fuse between the distribution block and the amplifier is recommended
  • Frequency Response: 20 Hz - 20 kHz
  • Dimensions: 9-9/16"L x 11-3/8"W x 2-1/4"H
  • 1-year SonicElectronix.com warranty

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.

120 watts x 2 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.

200 watts x 2 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.

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.
2
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.
0.1%
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.
1 pair
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)
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/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).
No
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

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
93%
4 Star
7%
3 Star
0%
2 Star
0%
1 Star
0%

Average Attribution Rating

Durability
5.0
Value
4.7
Features
4.9
Design
5.0
Usability
5.0
Cleeve

New Zealand

Overall
Durability
Value
Features
Design
Usability
Hard to fault

June 10, 2014

This is the first amp I've felt the need to review. It has served me so well in many different applications and I couldn't recommend it highly enough. I've run a 12" Rockford P3 600watt RMS at 4ohms bridged an Older P3 500 watts RMS bridged at 2ohms and it powered them both perfectly and sounded good doing it. I'm currently running it in stereo mode at 1ohm per channel with 200 watts RMS of speaker wattage per side with the gain set very low and its never missed a beat. Make sure you get the remote Punch EQ to go with it, it's perfect for fine tuning the amp when listening to different musical genres. This little amp is so versatile I'll probably never let it go. It's exceeded my expectations in every way. Try it for yourself you wont be disappointed.

0 of 0 found this helpful

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Cory

Sanborn, NY

Overall
Durability
Value
Features
Design
Usability
Beast Amp !

March 6, 2014

Amps great. Makes lots of clean power. Component set loves every bit of it.There are no cons to owning this. Get one, you wont regret it.

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HusseinR

Canada

Overall
Durability
Value
Features
Design
Usability
Great.

February 11, 2014

Gives you very loud and clear sound. It gives 30 watts more than stated, according to the birth sheet.

0 of 0 found this helpful

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RF

Mexico

Overall
Durability
Value
Features
Design
Usability
NO JOKE

November 20, 2013

this amp is no JOKE for its size it small but VERY. VERY. POWERFUL got it pushing 212 cerwinvega vmax bridged at 4 ohm and uffff…… its jet amazing…… totally worth the money…. buy it

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GravyGoodness

Elm City, NC

Overall
Durability
Value
Features
Design
Usability
Stupendous Amp - Excellent Value

October 24, 2012

I stepped up to the Power 400 from running a Prime series and all I can say is WOW! I don't know what RF does differently with these, but the difference is worth the coin. Used in conjunction with the PEQ remote you can have a little pop or a huge boom on demand. Even when pushing my 2 subs for about an hour, there is no sign of excessive heat. From the complete adjustability on each channel, to the fact that this amp is actually putting out almost 500 watts really sets this heads and shoulders above the rest of the pack in this price range. If your power needs are near what this amp provides, you owe it to yourself to give it a shot. I honestly could not be more pleased. Thanks Rockford Fosgate and SonicElectronix!

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Scott

Surprise, AZ

Overall
Durability
Value
Features
Design
Usability
Great Amp, Super Power, Simply Awesom

September 1, 2012

This amp pumps out the power, and then some. I have it on my front mids and highs... and its sends more power to them than they ever will need. Exactly what I would expect from a Rockford Product.

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Jack

Texas

Overall
Durability
Value
Features
Design
Usability
Great Thermal Management

April 26, 2012

I bought this amp to replace a JL. This thing is amazing. The gain is a very nice addition and works like a charm. Tunes very easily and delivers crisp sound to my Boston Acoustics component 6.5s. I have it placed between a bench and a sub box (very little air circulation) and this thing stays cool even on road trips. Very good buy.

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ed

los angeles,ca

Overall
Durability
Value
Features
Design
Usability
very powerful

January 8, 2012

This amp pushes out some serious power for its size!

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D- moo

Carencro Louisiana

Overall
Durability
Value
Features
Design
Usability
Go rockford

December 5, 2011

Wonderful product Rockford comes through yet again!

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derrick

swansboro, NC

Overall
Durability
Value
Features
Design
Usability
High Quality

May 1, 2011

All around good amp. My favorite thing was how the wires go into the amp. Nothing really special about it or anything I have just hooked up a lot of amps and like the way it holds the wires in and how it looks, it just looks more professional to me.

0 of 0 found this helpful

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ampman

AL

Overall
Durability
Value
Features
Design
Usability
Highly recommended performance amp.

January 18, 2011

Have one of these under the front seat powering a set of Boston Pro 60 SE. Using a 4 gauge wiring kit and this amp provides plenty of clean sounding power. Does not get too hot and makes the Bostons scream. Test papers that came with unit rate it at higher output than listed here. High and lowpass filters & treble boost there to fine tune your sound.

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Mark

Reidsville, NC

Overall
Durability
Value
Features
Design
Usability
Power is the right name.

July 28, 2010

This baby pushes more than enough juice. I have been using it for months now (6... 8?) and I'm still amazed by how hard my system hits (this amp + P3D215). Great value and you get quality (due to this being the Power series). If you have good voltage you should easily get 500watts out of it.

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LAZY

Jamestown, CA

Overall
Durability
Value
Features
Design
Usability
POUNDS 2 P2 12'S

March 2, 2010

I JUST GOT THIS T400-2 WITH 2 P2 12'S AND IT POUNDS. I PUT IT IN MY GIRLS 98 TOWN CAR AND IT IS SLUMMPIN. IT IS TO MUCH FOR HER, BUT JUST RIGHT FOR ME WHEN IM IN IT. NOW ITS MY TURN TO STEP UP MY SYSTEM IN MY GMC. I THINK IM GETTIN THE T600 THOUGH. VERY VERY HAPPY WITH SONIC, NEW PRODUCTS AT A GREAT PRICE MY LOCAL DEALER COULDN'T COMPETE WITH THEM AT ALL. BUT IT COULD OF CAME WITH A BASS KNOB ONLY PROB.

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Kevin

Baton Rouge, LA

Overall
Durability
Value
Features
Design
Usability
Great product

November 24, 2008

I have this amplifier running my front 6.5 components in two vehicles. Great results, crisp sound. Well worth the $.

0 of 0 found this helpful

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Accessory Tools and Products

Accessories added

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 $149.99

Belva BBG3KT CCA 1/0 Gauge Big Three Kit

Features everything needed to upgrade factory power and ground wire.

Your Price $39.99

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 XIV25 V-Series 2-Channel RCA Cable

16.4 ft 2-Channel RCA Audio Interconnect Cable with Twisted Pair Construction

Your Price $11.99

Kicker KI24 K-Series RCA Audio Interconnect Cable

4 Meters (13 ft.) 2-Channel K-Series RCA Audio Interconnect Cable

Your Price $16.95

NVX XWS1225 12 AWG Speaker Wire

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

Your Price $39.99

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 $104.99

SMD DD-1 Distortion Detector

Set the gain of an audio amplifier quickly and accurately

Your Price $149.99

AutoSound 2000 CD-102

High Frequency Test CD specifically designed for the set-up and evaluation of sound system imaging and placement.

Your Price $11.99

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

T400-2

UPC

780687324452

Weight

11.00lbs

Internal SKU

t400-2

Internal Product ID

8893

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 T400-2