Garage
Shop

Rockford Fosgate Prime R400-4D

400W 4-Channel Class D Prime Series Full Range Amplifier

Product videos
highlight-star-icon

• 75W x 4-Chan. @ 4 ohms
• 100W x 4-Chan. @ 2 ohms
• 200W x 2 Chan. @ 4 ohms Bridged
• Variable Bass Boost
• Variable High-Pass Crossover
• CEA-2006 Compliant

Learn more about the r4004d

We apologize

This item has been discontinued

Product Highlights


• 75W x 4-Chan. @ 4 ohms
• 100W x 4-Chan. @ 2 ohms
• 200W x 2 Chan. @ 4 ohms Bridged
• Variable Bass Boost
• Variable High-Pass Crossover
• CEA-2006 Compliant

Description


Rockford Fosgate brand icon

Authorized dealer



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.

General Features

  • 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.
  • CEA-2006 compliant amplifier
  • 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)
  • 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.
  • Authorized Internet Dealer
  • 1-year Manufacturer's Warranty

Specifications & Details


Power Specifications - Full Range Channels
RMS Power @ 4 ohms
75 watts x 4 channel
RMS Power @ 2 ohms
100 watts x 4 channel
Bridged RMS Power
200 watts x 2 channel
Amplifier Specifications
Series
Prime Series
Amplifier Class
D
Number of Channels
4-Channel
Total RMS Power Output
400 watts
Maximum Input Gauge Size
4 AWG
Minimum Impedance Unbridged
2 ohms
Minimum Impedance Bridged
4 ohms
THD at Rated RMS Power
1.0%
Speaker Level Inputs
No
Preamp Outputs
No
Built-in Crossover
Low-Pass (LP)
High-Pass (HP)
Full (AP)
High-Pass Crossover Frequency
50 - 250 Hz
Low-Pass Crossover Frequency
50 - 250 Hz
Signal-to-Noise Ratio
90 dB
Bass Boost
0 - 18 dB
Remote bass/level controller
No
Fuse Rating
40A x 1 In-line fuse recommended
Warranty and Return Policy
Parts Warranty Duration
1 year
Labor Warranty Duration
1 year
Warranty Provider
Manufacturer

Item Details


Manufacturer:

Model Number:

R400-4D

Weight:

5.53lbs

Internal SKU:

r4004d

Internal Product ID:

34761

Product and How-to Videos


  • 3Sixty3 Aftermarket Setup Wizard Tutorial
  • Rockford Fosgate Prime Series Amplifiers
  • How To Install an Amplifier: Car Amplifier Basics Part 2

Customer Ratings & Reviews



5 star
79%
4 star
12%
3 star
2%
2 star
2%
1 star
5%



Durability
4.6
Value
4.6
Features
4.6
Design
4.6
Usability
4.8

Customer Reviews

Sort by:

Loading...

Poor fidelity

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.

By Matt on September 27, 2013

37

found this helpful.

great

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

By lindy on December 23, 2013

32

found this helpful.

Good

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.

By Caleb on August 24, 2014

32

found this helpful.

Good amp

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.

By Edward on April 10, 2014

31

found this helpful.

Great Bang for the buck!

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

By Stacy on September 23, 2013

31

found this helpful.

small with a lot of power!!

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!!

By edrick on March 1, 2014

30

found this helpful.

Awesome amp! Rockford all the way!

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!

By Matt on December 11, 2013

29

found this helpful.

Like you need me to tell you to buy this amp

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.

By Paul on April 30, 2014

29

found this helpful.

Good Amp!

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

By Alex on November 22, 2013

28

found this helpful.

Excellent Amplifier

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.

By Geff on October 2, 2013

28

found this helpful.

Add-ons


Similar Products

Best selling similar products

JL Audio XD400/4v2

• 75 watts x 4 channel @ 4 ohms
• 100 watts x 4 channel @ 2 ohms
• Bridged: 200 watts x 2 channel @ 4 ohms
• Total RMS Power: 400 watts
• Class D 2 ohms Stable 4-Channel Amplifier

(9)

$349.99

NVX VAD10004

• 150 watts x 4 channel @ 4 ohms
• 250 watts x 4 channel @ 2 ohms
• Bridged: 500 watts x 2 channel @ 4 ohms
• Total RMS Power: 1000 watts
• CEA-2006 Compliant
• Class D 2 ohms Stable 4-Channel-Channel Amplifier

(14)

$279.99

NVX VADM4

• 400 Watt True RMS Output!
• Marine Certified 4-Channel Micro Class D Amplifier
• 75W x 4-Chan. @ 4 ohms
• 100W x 4-Chan. @ 2 ohms
• 3-Way System Protection
• 4/2 Channel Operation
• 8 Gauge Power and Ground Inputs
• Extremely Small Footprint!

(31)

$189.99

Rockford Fosgate PBR400X4D

• 50 watts x 4 channel @ 4 ohms
• 100 watts x 4 channel @ 2 ohms
• Bridged: 200 watts x 2 channel @ 4 ohms
• Total RMS Power: 400 watts
• Class D 2 ohms Stable 4-Channel Amplifier

$279.99

Taramps DS 1200X4

• 192 watts x 4 channel @ 4 ohms
• 300 watts x 4 channel @ 2 ohms
• Bridged: 600 watts x 2 channel @ 4 ohms
• Total RMS Power: 1200 watts
• Class D 2 ohms Stable 4-Channel-Channel Amplifier

$204.99

Related Searches


R400-4D small

Item added to your cart.

Price: $179.99

Essential add-ons
Belva BAK44

Complete 4-Channel CCA 4 Gauge Amp Kit with RCA Cables and Speaker Wire

$79.99

$39.99

Add to cart
Belva BAK44BL

Complete 4-Channel CCA 4 Gauge Amp Kit with RCA Cables and Speaker Wire

$79.99

$39.99

Add to cart
NVX XAPK4

4 Gauge 100% (OFC) Oxygen Free Copper Amplifier Power Wiring Kit with Speaker Wire

$114.99

$84.99

Add to cart
Stinger SK4241

4 Gauge Power Amplifier Installation Kit

$129.00

$64.99

Add to cart
Stinger SK6241

4 Gauge Power Amplifier Installation Kit

$159.00

$79.99

Add to cart
Universal Remote Bass Level Control Knob

Flush Mount & Universal via RCA. Works with any amp, controls your bass output

$14.99

$7.99

Add to cart
4 inputs / 4 outputs High Voltage Active Line Output Converter with Impedance Matching and Remote Level Control

The XLOC44X helps you easily integrate with your factory or aftermarket system

$149.99

$64.99

Add to cart
NVX XIX45 X-Series RCA Interconnect Cable

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

$44.99

$20.99

Add to cart
NVX V-Series RCA Interconnect Cable

19 ft. of 4-Channel RCA cable with dual twisted-pair conductors

$32.99

$15.99

Add to cart
80 Amp Smart Relay Isolator (XSBI80)

Smart isolator - Monitors and auto-charging feature!

$49.99

$24.99

Add to cart
80 Amp Relay Isolator (BIR80)

Great for isolating a second batter making it dedicated to the stereo system

$19.99

$14.99

Add to cart
200 Amp Smart Relay Isolator (XSBI200)

Smart isolator - Monitors and auto-charging feature!

$79.99

$54.99

Add to cart
500 Amp Smart Relay Isolator (XSBI500)

Smart isolator - Monitors and auto-charging feature!

$99.99

$74.99

Add to cart
500 Amp Relay Isolator (BIR500)

Does not create a voltage drop to the second battery like conventional isolators

$89.99

$65.99

Add to cart
NVX XCAP1F

True 1.0 Farad 20V Capacitor with Digital Read-out, Built-in Distribution Block

$124.99

$89.99

Add to cart
Belva BB1D

1.0 Farad Capacitor with Digital Red Display for up to 1000W Max

$79.99

$34.95

Add to cart
Belva Nine Function Digital Multimeter

Perfect for any installation and troubleshooting

$29.99

$9.99

Add to cart
Six Function Digital Multimeter

Perfect for every toolbox

$14.99

$6.99

Add to cart
Steve Meade Designs IM-SG

Impedance Meter / Signal Generator

$461.99

$451.99

Add to cart
SMD DD-1 Distortion Detector

Set your gains like a Pro, accurately and quickly

$207.99

$199.99

Add to cart
SMD CC-1 Crossover Calibrator

This is a must have! Set your crossover frequency like a Pro

$195.99

$192.99

Add to cart
Universal Positive/Negative 1/0 or 4 Gauge Battery Terminal

Make installation a breeze with the XBTU

$24.99

$16.99

Add to cart
World's Smallest AFS / Mini ANL Fuse Holder

Accepts 4 gauge or 8-gauge wire

$19.99

$10.99

Add to cart
4/8 Gauge Mini ANL (MANL, AFS) Fuse Holder

4/8 Gauge Mini ANL (MANL, AFS) Fuse Holder

$9.99

$6.99

Add to cart
High Quality Element Resistant AGU Fuse Holder

Belva BAGUH2 AGU Fuse Holder

$9.99

$4.99

Add to cart
4/8 Gauge AGU Fuse Holder

4/8 Gauge AGU Fuse Holder

$9.99

$6.99

Add to cart
Modular Linkable ANL Fuse Block

Modular Linkable ANL Fuse Block

$59.99

$16.99

Add to cart
ANL/Mini-ANL Fuse Holder with 1/0 or 4 Gauge Input and Output

No-fail termination and current flow, it helps keep your system protected and running smoothly

$24.99

$13.99

Add to cart
4/8 Gauge Mini-ANL/MANL/AFS Fuse Holder

4/8 Gauge Mini-ANL/MANL/AFS Fuse Holder

$9.99

$8.99

Add to cart
4 Pack of 80 Amp Nickel-Plated MANL Fuse

Mini-ANL (MANL/AFS) 80A Nickel Plated Fuses

$8.99

$3.99

Add to cart
4 Pack of 100 Amp Nickel-Plated MANL Fuse

Mini-ANL (MANL/AFS) 100A Nickel Plated Fuses

$8.99

$3.99

Add to cart
4 Pack of 150 Amp Nickel-Plated MANL Fuse

Mini-ANL (MANL/AFS) 150A Nickel Plated Fuses

$8.99

$3.99

Add to cart
2 Pack of 100 Amp Nickel-Plated ANL Fuse

ANL 100A Nickel plated for better power transfer

$7.99

$3.99

Add to cart
2 Pack of 200 Amp Nickel-Plated ANL Fuse

Two fuses per order. High quality 200 Amp ANL Fuses

$7.99

$3.99

Add to cart
2 Pack of 300 Amp Nickel-Plated ANL Fuse

Two fuses per order. High quality 300 Amp ANL Fuses

$7.99

$3.99

Add to cart
Gauge Reducer, 4 Gauge Input to 8 Gauge Pin

Great for amplifiers that do not accept a large gauge power wire

$14.00

$9.99

Add to cart
Pair of 4 Gauge Spade Terminals, #8 Opening

Spade Terminals • 4 Gauge • 1 Red & 1 Black • Nickel Plated

$3.99

$1.99

Add to cart
4 Gauge Ring Terminals with 3/8" Opening (5 Pieces)

4 Gauge Ring Terminals with 3/8" Opening (5 Pieces)

$9.99

$2.99

Add to cart
5 Pack of Black 4 Gauge Ring Terminals

5 Pack of Black 4 Gauge Ring Terminals

$6.99

$3.99

Add to cart
(4-pack) 4 Gauge Solid Copper Ring Terminals with Shrink Tubing

(4-pack) 4 Gauge Solid Copper Ring Terminals with Shrink Tubing

$9.99

$9.99

Add to cart
NVX VUBT2

Universal Bluetooth Audio Receiver

$49.99

$39.99

Add to cart
Marine Grade Bluetooth Audio Controller/Receiver

Marine Grade Bluetooth Audio Controller/Receiver

$62.49

$48.99

Add to cart
NVX XUBT3

Universal Bluetooth Audio Receiver & Volume/Playback Controller Knob

$99.99

$59.99

Add to cart
Save up to 10 different vehicles in your garage

Loading...
Identify your vehicle and submodel details
  • Owner’s manual
  • Vehicle’s insurance card
  • Vehicle registration
  • Vehicle produced after 2005: Inside driver’s side door
  • Vehicle produced before 2005: Rear passenger doorjamb, glove box, center console, or engine compartment
Car Info Side Door Icon
Vehicle Registration Icon
Vehicle Insurance Icon