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Rockford Fosgate Prime R400-4D 4-channel car amplifier — 75 watts RMS x 4 (Factory Refurbished)

Item # 675R4004D

Rockford Fosgate packs more power per square inch into their Prime Class D amps than almost any other amplifier...

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Rockford Fosgate packs more power per square inch into their Prime Class D amps than almost any other amplifier...

1 question - 10 answers

Item # 675R4004D

About the Rockford Fosgate Prime R400-4D

Bob Bihlmayer
Rockford Fosgate packs more power per square inch into their Prime Class D amps than almost any other amplifier made, so you can put more music power in your vehicle's limited space. Your music will play loud and clear with one of these reliable and cool-running amps.
More power per square inch

Rockford Fosgate packs more power per square inch into their Prime Class D amps than almost any other amplifier made, so you can put more music power in your vehicle's limited space. Your music will play loud and clear with one of these reliable and cool-running amps.

4-channel versatility
The R400-4D 4-channel amp puts out 75 watts RMS per channel to each of your full-range speakers or components, giving them plenty of juice to rock. You can also use the front channels of the R400-4D for your front speakers while using the rear channels bridged to run a sub with up to 200 watts RMS. And, of course, you can bridge the amp to 2-channel mode to drive a pair of subs.

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Product highlights:

  • 4-channel car amplifier
  • 75 watts RMS x 4 at 4 ohms (100 watts RMS x 4 at 2 ohms)
  • 200 watts RMS x 2 bridged output at 4 ohms (4-ohm stable in bridged mode)
  • CEA-2006 compliant
  • variable high- and low-pass filters (50-250 Hz, 12 dB/octave)
  • variable Punch EQ bass/treble boost (0-18 dB at 45 Hz and 12,000 Hz)
  • Class-D amplifier design
  • MOSFET power and output stages
  • frequency response: 20-20,000 Hz
  • preamp inputs and outputs
  • 4-gauge power and ground leads recommended — wiring and hardware not included with amplifier
  • no onboard fuses — when installing multiple amps in a system, an additional 40-amp in-line fuse between the distribution block and the amplifier is recommended
  • 9-1/8"W x 2"H x 7-3/8"D
  • warranty: 90 days
  • MFR # R400-4D

What's in the box:

  • Refurbished 4-Channel amplifier
  • 3mm Hex key
  • Installation & Operation Manual
  • Amplifier Verification Certificate
  • 4 Self-tapping screws (length=1-5/8")

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More details on the Rockford Fosgate Prime R400-4D

Mark G.

Product Research

Features
Controls
Connections

Features

Overview: The Rockford Fosgate Prime R400-4D is a 4-channel full-range Class D amplifier. It is optimized to power a full-range front/rear speaker system. You can also bridge the front and/or rear channels to run a subwoofer or two. The Class D design is very efficient with a cast aluminum heatsink to keep it in a small footprint.

CEA 2006 Compliant: The R400-4D's power ratings are measured according to the strict standards dictated by the Consumer Electronics Association (CEA). These standards allow you to accurately compare the rated power output of all CEA 2006-compliant amplifiers, even different brands. Manufacturers who adhere to the standards can display the CEA 2006 logo on their products and packaging. The RMS power output is as follows (measured with a 14.4 volt input, <1% THD+N, 20 Hz-20 kHz):

  • 4-Ohm: 75 watts x 4
  • 2-Ohm: 100 watts x 4
  • Bridged (4-Ohm): 200 watts x 2

LED Indicator: The amplifier is equipped with a top-mounted LED indicator which illuminates blue when the unit is turned on. The LED illuminates red when a protection circuit engages (short circuit or too low an impedance is detected at the speaker connections). The amplifier automatically turns off if this occurs.

Mounting: The amplifier can be mounted vertically, horizontally, or inverted using the supplied mounting screws; horizontal mounting (right side up) will provide the best cooling.

Controls

Independent Controls: The R400-4D has independent, top-mounted controls for the front and rear channels. The controls include:

  • Gain Control: The amplifier has rotary gain controls (0 to 11) for front and rear channels.
  • Crossovers: The amplifier features independent Butterworth crossovers for the front and rear channels. Each crossover can be set for low-pass, high pass, or all-pass (full range). The crossover frequency is continuously variable from 50-250 Hz with a slope of 12 dB per octave.

Punch EQ: The rear channel has an independent Punch EQ (bass boost) control that works with the crossover switch. When the rear channel crossover is set to low-pass, the Punch EQ can add a bass boost, centered at 45 Hz, from 0 dB to +18 dB.

2/4 CH Switch: When the 2/4 CH switch is set to the 2 CH position, the inputs are switched to a 2-channel mode. The signal on the front input feeds all four output channels, however, you lose front to rear fading capability. In the 4 CH position, the amp uses both front and rear inputs and fading capability is restored.

Connections

Power Terminals: The power and ground terminals are nickel-plated set-screw terminals, and will accommodate up to 4-gauge wire. The set screws can be tightened/loosened with the supplied 3mm hex key.

Fuses: The amplifier does not have on-board fuses. A 40A fuse should be placed on the power wire within 18" of the battery.

Remote Turn-On Terminal: The remote turn-on terminal is a nickel-plated set-screw terminal that will accommodate up to 8-gauge wire. The set screws can be tightened/loosened with the supplied 3mm hex key.

Speaker Terminals: The speaker terminals are nickel-plated set-screw terminals that will accommodate up to 8-gauge wire. The set screws can be tightened/loosened with the supplied 3mm hex key.

RCA Input Jacks: There are two pairs of RCA input jacks for the front and rear channels. They are nickel-plated to resist signal degradation caused by corrosion.

RCA Pass-Thru Jacks: The nickel-plated RCA pass-thru jack provides a convenient source for daisy-chaining an additional amplifier without running an extra set of RCA cables from the front of the vehicle to the amplifier location.

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Customer Q&A

1 question already asked

Q
Do these refurbished amps come with birth sheets or something showing actual RMS output?
christian  Feb 16, 2015
10 answers
A
Hello, yes the actual RMS rated output is included in the owners manual at 75 watts x 4
randall  Feb 23, 2015
A
SORRY I DONT KNOW WHAT YOU MEAN ABOUT BIRTH SHEETS WHAT I CAN TELL YOU IT WORKS PERFECT
carmelo  Feb 20, 2015
A
I wouldn't buy them. Our amp was defective, didn't work and was returned.
brian  Feb 16, 2015
A
It did come with the birth sheets in the box.
kenneth  Feb 16, 2015
A
Yes, mine did come with a sheet showing actual tested RMS output post repair. Works well, I wouldn't hesitate to buy refurbished after my experience.
philip  Feb 16, 2015
A
Yes they do and although I hadn't strapped it to confirm the performance has been flawless.
steve  Feb 16, 2015
A
Yes , they come with birth sheets and actual RMS output documentation
patrick  Feb 16, 2015
A
Yes much to my surprise and enjoyment my refurbished Rockford amp looked brand new and came with a birth sheet. I think it benched just over 500 watts rms. I am running it in 4 channel mode to Rockford 60 watt components and the speakers can only handle the gain set around 3-4. This amp def packs a lot more power than advertised, def happy with it. For the price I don't think you could find a better 4 channel amp.
brett  Feb 16, 2015
A
Knowing Crutchfield, it will come with an amp and that should have RMS output. I am sure when they refurbish them they are to the company spec.. Never had a bad crutch field item, and I have been buying there stuff for years.
mike  Feb 16, 2015
A
Yes mine came with birth sheet. I'm using this amp to push 2 6.5's and 2 6.5's and this baby rocks!
fellie  Feb 16, 2015

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