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Rockford Fosgate R400-4D

400W 4-Channel Class D Prime Series Amplifier

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List price $279.99

$169.99

with warranty

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Arrives by Monday, Sept. 22 to zip 07095

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40% Off on 4-Channel RCA Cables w/ purchase!

Save 40% off the NVX XIV45 4-Channel RCA Audio Interconnect cables with your purchase! You will need RCA cables to install your amp!

9.60

34761

427

Rockford Fosgate R400-4D

$169.99

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NVX XIV45

$23.99

Special Price $14.39 ($23.99 if purchased separately)

NVX XIV45

5m (16.40 ft) 4-Channel Twisted RCA • V-Series • Frost Blue Jacket • Dual Twisted Pair Hyper-Flex Technology For Better Signal Transfer

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Combined Total Price

$184.38

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Prime Certified Power

There is no better feeling than getting exactly what you paid for. This will always be the case with Rockford Fosgate's R400-4D 4-channel amplifier. This CEA-2006 compliant amplifier will give you the rated power output each and every single time, making you feel like your money was well spent. The variable high-pass crossover and variable bass boost will allow for more control of your music to be set at your personal preferences. Rockford Fosgate is well known for making great products and this amplifier is no exception. The heavy duty cast aluminum alloy heatsink will help reduce heat and lower distortion levels or possible thermal overload. This will keep your amplifier running smooth and safely during any listening session. So if you are looking for a reliable, and efficient 4-channel amplifier without breaking the bank, then the R400-4D is the perfect amplifier for you.

  • Prime Series Full Range Class D 4-Channel Car Amplifier
  • RMS Power Rating:
    • 4 ohms: 75 watts x 4 chan.
    • 2 ohms: 100 watts x 4 chan.
    • Bridged, 4 ohms: 200 watts x 2 chan.
  • MOSFET power supply
  • LED power (green) and protect (red) indicators
  • Variable Bass Boost (0 to +18 dB bass boost at 45 Hz)
  • Soft Start Turn-on
  • 4/2 channel switch
  • 40 Amp In-line fuse is highly recommended
  • Heavy duty cast aluminum alloy heatsink for extreme heat dissipation
  • Nickel-plated RCA level inputs
  • Nickel-plated screw terminals
  • Variable high-pass filter (50-250 Hz, 12 dB/octave)
  • Variable low-pass filter (50-250 Hz, 12 dB/octave)
  • CEA-2006 compliant amplifier
  • Dimensions: 6-11/16"L x 11"W x 2"H
  • 4-gauge power and ground wiring is required for installation. Contact us for information regarding a discount on select amplifier kits when purchased together with this amplifier.
  • 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.

75 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
RMS Power @ 1 ohm

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 1 ohm, 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.

Not Stable
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

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.
Prime (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.

D
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.
1.0%
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 - 250 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 - 250 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.
90 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.
No
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
Fuse Rating
The amperage and the number of fuse(s) an amp requires.
40A x 1 In-line fuse recommended
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

Specials with this Item

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Warranty and Return Policy

Parts Warranty Duration
1 year
Labor Warranty Duration
1 year
Warranty Provider
Sonic Electronix

Summary of Customer Ratings & Reviews

Rating Distribution

5 Star
77%
4 Star
10%
3 Star
3%
2 Star
3%
1 Star
7%

Average Attribution Rating

Durability
4.4
Value
4.5
Features
4.5
Design
4.6
Usability
4.7

Jonah

Dallas, TX

Overall
Durability
Value
Features
Design
Usability

Small and Powerful

November 26, 2011

I'm so happy I finally decided to add an amp to power my Polk db series speakers in my truck; it makes a world of difference in the sound quality, especially in the amount of bass added to my front stage. I went with this amp because I needed a small amp in the 50-75w rms range that would fit under my seat. This amp does not disappoint! I knew it would be small, but I wasn't prepared for how compact this little thing would be. Even with this amps small size, heat is not a problem. This amp is Class D, so it runs very efficiently, and therefore very cool. It just gets warm to the touch and has plenty of power for pretty much any system. The amp sounds great, although there is slight distortion at zero volume, but once music is playing this sound is inaudible (this distortion is probably more noticeable because I have 2v preouts and have to turn the gains a little higher than if I had 4v ones). Build quality is extremely solid and I expect this amp to last forever, my only gripe is that controls on top are a little flimsy, but this isn't a big deal at all. Overall this is a great little amp. If you're in the market for a small and powerful amp look no further than the R400-4D.

2 of 2 found this helpful

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Caleb

Burkburnett, TX

Overall
Durability
Value
Features
Design
Usability

Good

August 24, 2014

I have had this for a couple months now and it works great. I had to send it back for replacement after a week of owning it, not really sure what happened. Rockford fosgate is a reliable product usually but the first one started smoking after I had been using it for a while. Sonic electronix replaced it and it works great now. I do recommend buying a amp fan to go with it because it does get very hot after long periods of time. Sounds great though.

0 of 0 found this helpful

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ceon

hogansville, GA

Overall
Durability
Value
Features
Design
Usability

ford ranger

August 4, 2014

i need a small amp to fit under my seat that does not get hot and This the one

0 of 0 found this helpful

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steve

fraser, MI

Overall
Durability
Value
Features
Design
Usability

rockford r400-4d

July 23, 2014

this rockford amp is a great product. works well,looks good and stays cool.

0 of 0 found this helpful

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Jonathan

Fort Worth, TX

Overall
Durability
Value
Features
Design
Usability

YES

July 1, 2014

These are powering my NVX v-series speakers very well. There is not much to say - this amp can work like a slave without dying from the heat, literally. The sound quality is excellent (maybe since it's a Class D amp) and the features are good too. I have absolutely no regret purchasing this amp.

0 of 0 found this helpful

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Brooke

hickory, NC

Overall
Durability
Value
Features
Design
Usability

Great amp

June 22, 2014

Came 514w out the box gain is matched to the deck at 1 and never gets hot.

0 of 0 found this helpful

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Dohlo

Bay Area, CA

Overall
Durability
Value
Features
Design
Usability

Right size for compact installs, but lacks in sound quality

May 16, 2014

This amp is great if you're in a budget and looking for a small footprint for a compact install. But it significantly lacks in sound quality. For its size it's puts out gobs of power (birth sheet claims 514 burst power) but the sound is very... Flat. Midbass lacks clarity, highs became harsh relatively low in volume. I tried everything but I was disappointed from the get go. The old school (90's) Orion amp it replaced had MUCH better sound than this amp, much more "musical" really. It's not that this amp is terrible, it's just not great. Maybe it would be a different story when powering a sub, but if you're looking for great sound quality look elsewhere or at least a higher end RF amp.

0 of 0 found this helpful

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Paul

New Lenox, IL

Overall
Durability
Value
Features
Design
Usability

Like you need me to tell you to buy this amp

April 30, 2014

Mated the Rockford Fosgate R400-4D to a Pioneer head unit. Wow! Amazing sound. Loud. Crisp. Clear. Everything you want in a sound system. Fits perfectly under the front driver's seat. It sounded great out of the box but is absolutely superb now that I've been able to tweak it a little bit. Installed the amp using an NVX Audio XKit44 with 4 gauge wire 4 channel connection kit. Stop reading reviews and buy this amp.

0 of 0 found this helpful

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Edward

Zachary, LA

Overall
Durability
Value
Features
Design
Usability

Good amp

April 10, 2014

Great highs amp for powering small speakers. That's all I use it for and it's not even at the 12 o clock position. I would recommend it. Also I like the fact that it's compact in size.

0 of 0 found this helpful

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edrick

Puerto Rico

Overall
Durability
Value
Features
Design
Usability

small with a lot of power!!

March 1, 2014

This amp is great.. I bough it to wire 4 Rockford Fosgate PPS8-6 to wire them at bridge 4ohms (2 speakers at each channel bridge) let me tell you..WOW!! This amp gives power to the speakers and I'm happy with that..I recommend this amp and for the price..NICE!!

0 of 0 found this helpful

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lindy

Gretna, LA

Overall
Durability
Value
Features
Design
Usability

great

December 23, 2013

This is my first amp of d class, but once tuned with scope or whatever It is this amp Gets it.

0 of 0 found this helpful

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Matt

Jacksonville, FL

Overall
Durability
Value
Features
Design
Usability

Awesome amp! Rockford all the way!

December 11, 2013

I have been wanting to build an all Rockford system for a while, I knew I wanted to run a sub and four new speakers (All Rockford) but didn't want to buy two amps. This amp was the answer, pushing 500 RMS @ 2 ohms (according to the birth sheet) this thing rocks. I have two pairs of 4-ohm Rockford 6.5s running at 2-ohms bridged. So they are getting a good 65 RMS each, and they produce great highs and mid. For the lows, I have a DVC 10" Rockford sub that's being pushed a good 250 RMS. The sound is amazing, highs, lows, mids, everything all in perfect crisp harmony. This amp is absolutely amazing, not to mention its a perfect size. All my friends find it hard to believe that this little amp pushes so hard. Worth every penny!

0 of 0 found this helpful

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David

Huntsville, AL

Overall
Durability
Value
Features
Design
Usability

outstanding performance

December 2, 2013

this is my second Rockford product and I am very happy with the amp performs great and matches with the MB Quart speakers better than any other set up I have owned

0 of 0 found this helpful

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Alex

Fresno, CA

Overall
Durability
Value
Features
Design
Usability

Good Amp!

November 22, 2013

Fast shipping, never have problems with the amp, & puts out more than it says.

0 of 0 found this helpful

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JB

las vegas, NV

Overall
Durability
Value
Features
Design
Usability

702 LOUDNESS

November 19, 2013

Great little amp, the crossovers built into this amp are outstanding, I can dial any music from thrash to rap, and a great price, thanks sonic electronix

0 of 0 found this helpful

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JB

las vegas, NV

Overall
Durability
Value
Features
Design
Usability

702 LOUDNESS

November 11, 2013

I got this amp because my 50 x4 four channel was out,sure glad I did,75 x 4 ,much nicer ,could not believe my ears,an for the price,also john was very helpful helping match the watts to the speakers I have thanks again sonic electronix

0 of 0 found this helpful

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Geff

Upland, IN

Overall
Durability
Value
Features
Design
Usability

Excellent Amplifier

October 2, 2013

Got this amplifier to power my six speakers in my '99 Camaro; it does an excellent job! Ran the two rear pair in parallel and made a custom MDF rack to mount both this amp and the sub amp on the trunk deck just behind the back seat. My only frustration with the amplifier is the angle that the wires have to enter into the terminals at; they wires have to bend upward. It's just less convenient than having terminals coming straight out of the amplifier. As far as sound quality goes, this amplifier brought my Rockford Fosgate Punch speakers to life! The clarity is brilliant and the crossovers work splendidly. I am very pleased with my purchase and will always look to Rockford for car audio components.

0 of 0 found this helpful

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Matt

Rancho

Overall
Durability
Value
Features
Design
Usability

Poor fidelity

September 27, 2013

The product is OK for a kid, or for a very noisy environment, but not OK for a discriminating ear. I tried this route because I was trying to put the amps under a cover, I thought they would stay cooler. Nope. This guy gets hot. I would recommend to some, but not others.

0 of 0 found this helpful

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Stacy

Grand Prairie, TX

Overall
Durability
Value
Features
Design
Usability

Great Bang for the buck!

September 23, 2013

Awesome power for such a small size. Fits in small space.

0 of 0 found this helpful

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Vince

Vienna, VA

Overall
Durability
Value
Features
Design
Usability

Excellent amp for the money!

September 17, 2013

I bought this amp to replace a PPI P600.2 because I needed 2 more channels to run an active front stage. I'm powering a JBL P660C component set ran active from a MiniDSP. After I adjusted my gains the noise floor was basically nonexistent and my speakers have never sounded better. They get louder than I would ever want and sound great doing it. The amp is tiny, even smaller than I expected, and fits under my driver's seat with plenty of room around it. It never gets even warm to the touch, even after playing music for over an hour on hot summer days with the windows down. The birthsheet said it produces almost 550 watts and I believe it. If you need a small 4 channel amp that has plenty of power for not much money, you can't do much better than this! Also, I own the Rockford Fosgate R1200-1D that powers my 2 Polk MM1240 subs and all of the same things hold true for it as well.

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 $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

Universal Remote Level Bass Control

Controls bass level and frequency via RCA/Interconnect connectors on any amp.

Your Price $7.99

Small Universal Remote Level Bass Control

The Scosche RLC is a smaller universal bass remote that connects via RCA inputs.

Your Price $11.99

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

Professional Installation for your Car Power Amplifier

Covers labor charges through our professional installer network.

Your Price $89.99

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

Scosche SPL Meter SPL1000F

Handheld boomSTICK measures your SPL range from 60 to 135 dB

Your Price $21.99

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

Browse 2 questions and 10 answers
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Why did you choose this?
Sonic Electronix Store
it's a really great deal. heard great things about this amp
Ryan S on Sep 14, 2014
I love Fosgate material cause it puts out very good sound
gregory r on Sep 9, 2014
what is the punch level remote?
A shopper on Aug 8, 2014
Best Answer: The Punch level remote allows you to "turn the bass down" while the volume of your music remains the same. This becomes useful if you're not in the mood for heavy bass, allowing you to turn it down while not losing any settings.
Reply · Report · David F on Aug 9, 2014
· Add Answer · I Have This Question Too (0)

Product Summary

Manufacturer

Model Number

R400-4D

UPC

780687333119

Weight

5.53lbs

Internal SKU

r4004d

Internal Product ID

34761

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 R400-4D

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