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Rockford Fosgate Punch PBR400X4D

Compact 4-channel car amplifier — 50 watts RMS x 4

Item # 575PBR4004

Rockford Fosgate's incredibly small Punch PBR400X4D 4-channel amp will put out 50 watts RMS to each of your front...

Find what Fits your vehicle

Rockford Fosgate's incredibly small Punch PBR400X4D 4-channel amp will put out 50 watts RMS to each of your front...

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About the Rockford Fosgate Punch PBR400X4D

Buck Pomerantz

This lightweight packs a punch

Rockford Fosgate's incredibly small Punch PBR400X4D 4-channel amp will put out 50 watts RMS to each of your front and rear speakers, giving you the power to fill your listening space with great-sounding music. You can also run this amp in 2-channel mode to drive a couple of high-performance speakers or subs with up to 200 watts RMS each.

This lightweight packs a punch

Rockford Fosgate's incredibly small Punch PBR400X4D 4-channel amp will put out 50 watts RMS to each of your front and rear speakers, giving you the power to fill your listening space with great-sounding music. You can also run this amp in 2-channel mode to drive a couple of high-performance speakers or subs with up to 200 watts RMS each.

Boosted Rail (BR) amp technology

This Punch Class BR amplifier generates this power from a very tiny case — literally the size of your hand. Boosted Rail amp technology uses capacitors and high-speed circuitry to boost the amp's power supply voltage when needed, so it can handle musical peaks without missing a beat. Rockford Fosgate uses this new technology to create a remarkable amp that fits almost anywhere and delivers powerful sound.

Features that keep you rockin'

The amp also features speaker-level inputs with signal-sensing turn-on, allowing you to connect into almost any system without having to run a turn-on lead back to the receiver. An extruded aluminum heat sink combines with Rockford Fosgate's heat management technology to make sure your tunes keep rockin' — even when you're playing loud.

Easy to set for optimum performance

The PBR400X4D features Rockford Fosgate's C.L.E.A.N. technology (Calibrated Level Eliminates Audible Noise) — a setup system that ensures your music will sound as clean and powerful as possible. Just download the setup tones from Rockford Fosgate, adjust the receiver volume until a red clip light on the amp goes out, then turn the amp gain up until a blue light comes on. It's that simple. When your receiver reaches maximum clean volume, you'll get maximum clean power from your Punch amp. At quiet listening levels, you'll hear less background noise and more of your music.

Rockford Fosgate Punch PBR400XD

Punch PBR400X4D control panel


Product highlights:

  • 4-channel car amplifier
  • 50 watts RMS x 4 at 4 ohms (100 watts RMS x 4 at 2 ohms)
  • 200 watts RMS x 2 bridged at 4 ohms (4-ohm stable in bridged mode)
  • CTA-2006 compliant
  • Boosted Rail amp technology
  • C.L.E.A.N. gain setup system includes clip lights and link to Rockford Fosgate's setup tones
More Features:
  • switchable high-pass filters (off/60/80 Hz at 12 dB/octave) on front and rear channels
  • switchable low-pass filters (off/80 Hz at 12 dB/octave) on front and rear channels
  • preamp and speaker-level inputs
  • signal-sensing turn-on with speaker-level inputs eliminate need for remote turn-on lead
  • wiring, fuse, and hardware not included with amplifier
    • 8-gauge power and ground wires and a 60-amp fuse recommended
  • dimensions: 6-3/4"W x 1-9/16"H x 4-1/4"D
  • warranty: 1 year
  • Our 60-day money-back guarantee
  • MFR # PBR400X4D

What's in the box:

  • 4-Channel amplifier
  • Two 15" input harnesses
  • Two 8" speaker-level output harnesses
  • Amplifier Quick Setup
  • Certificate of Performance Verification sheet
  • Class-BR Amplifier Installation Advisory sheet

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Rockford Fosgate Punch PBR400X4D reviews

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Boosted Rail Technology: The PBR400X4D full-range Class-D amplifier uses Boosted Rail Technology (BRT), an efficient design that doesn't use a switching power supply. The super-efficient PBR400X4D has an extruded aluminum heatsink to dissipate heat. Its compact design makes it ideal for motorcycles, ATVs, golf carts, and side-by-sides.

Differential Inputs: The PBR400X4D is compatible with either line-level (RCA) or speaker-level inputs. The included Molex-to-RCA harnesses are used in both cases. If you are not using RCA cables, you can cut off the RCA connections and solder the harnesses to speaker wires from the source unit.

Auto Turn-on/Remote Out: When using speaker-level inputs, the amp will automatically turn on when it senses an input signal (4 volt minimum). This is helpful when connecting the amp to a factory radio without a turn-on lead. In addition, when using speaker-level inputs, the remote terminal becomes an output, allowing you to daisy-chain the turn-on signal to another amplifier.

LEDs: The Power/Protect LED on the right side of the amp illuminates blue when the amp is turned on and operating normally. It illuminates red when one of the protection circuits has engaged (short circuit, impedance too low, or temperature too high). On the left side are three LEDs that glow red when clipping occurs on the input, left output, or right output. This C.L.E.A.N (Clipping Calibrated Level Eliminates Audible Noise) level-setting technology helps you to obtain the optimum input and output signals.


Crossover: The front and rear channels have independent Butterworth 12dB/Octave crossovers with separate 4-way switches. You can set the crossovers to Low-Pass (fixed at 80Hz), All-Pass (crossover bypassed), High-Pass (fixed at 60Hz), or High-Pass (fixed at 80Hz).

Gain: The front and rear channels also have independent input gain controls, adjustable from 150mV to 11V.

2CH/4CH Switch: You can connect four channels or two channels to the amplifier's input. The 2CH/4CH switch lets you select the number of channels connected to the amplifier. When 2CH is selected, all four channels receive the signal from the Ch1/Ch2 input.


Power Connections: The power, ground, and remote turn-on terminals are c-clamps on a removable plug. Each terminal will accommodate up to 8-gauge wire (Rockford recommends 8-gauge minimum for the power and ground wires). A flat blade screwdriver (not supplied) is required to tighten/loosen the terminals. There is no fuse on the body of the amp, so an external 60-amp fuse (not included) must be installed in the power wire. If a wiring kit is used that includes a different value fuse, the original should be replaced with a 60-amp fuse.

Signal Input: The included input harnesses have Molex plugs on one end (plugs into the amp) and female RCA plugs on the other. When using speaker-level inputs the RCA ends can be cut off and the four individual wires are used.

Speaker Output: The included speaker output harnesses have Molex plugs on one end (plugs into the amp) and tinned bare wires on the other.

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Customer Q&A

9 questions already asked

Do I need to buy additional items in order to install?
[ Tre  Dec 24, 2022 ]
1 answer
This amp does not come with the wiring necessary to install it. That wiring includes power cabling, audio input cabling, and speaker wire. We have advisors that can be reached by calling 1-800-324-9695 who can discuss your setup and system build plans to give a personal recommendation on all the gear needed to install this amp.
[ JASON  Dec 24, 2022 ]  Staff
Can you run 2 4 ohm 6.5" and a sub on bridged rear channels?
[ Kevin  Oct 20, 2022 ]
1 answer
Greetings Kevin, and thank you for your question. You can as long as your subwoofer is ran at 4 ohms (either a single voice coil 4 ohm, or a dual voice coil 2 ohm wired to 4 ohms). The amp bridged is stable at 4 ohms.
[ Thomas  Oct 20, 2022 ]  Staff
How many inches wide and long ?
[ Gary  Jun 06, 2022 ]
1 answer
Greetings Gary, thank you for your question. The dimensions are as follows: 6 3/4 inches wide X 4 1/4 deep X 1 9/16 high.
[ Thomas  Jun 07, 2022 ]  Staff
Installed this amp and now my turn signals and door chime are so load I want to take the amp out. Any suggestions?
[ JAMES  Nov 20, 2021 ]
2 answers
Sounds like a n interference problem associated with where your power wires are hooked
[ JACKIE  Nov 20, 2021 ]
Depending on the model of car, I would assume there is the option of lowering the chime volume in your stereo/head unit menu. It sounds like your car (which quite a few do) uses the head units built in amp to play your various chimes through your door speakers. This has now been amplified again.. if the volume can't be adjusted through the head unit, there are audio attenuators you can get to cut down that specific signal. Should be a specific wire you can find that sends the chime and blinker signals to the head unit.
[ TANNER  Nov 20, 2021 ]
How do I set up with out the set up disc?
[ STEVE  May 08, 2021 ]
2 answers
I ripped the cd, loaded them onto an iPod and then played them through the system.
[ PADDY  May 08, 2021 ]
Go to Rockford Fosgate website download test tracks on your phone or tablet or thumb drive
[ HANS  May 08, 2021 ]
Will this accept RCA inputs and speaker wire outputs?
[ KEVAN C  Mar 29, 2021 ]
2 answers
Yes both input & output will accept RCA
[ Kenneth  Mar 29, 2021 ]
Yes. It has been a while since I installed, but believe there is a wiring harnesses included for front & rear rca inputs. There are also wiring harnesses included for the outputs you must splice speaker wires to.
[ Matt  Mar 29, 2021 ]
Can I use bigger power and ground wires?
[ REMON  Mar 02, 2021 ]
2 answers
[ Kenneth  Mar 29, 2021 ]
As long as the wires will fit in the terminal adapters you can go as big as they will allow. The spec sheet for the amp should tell you how big of a wire it will accept
[ Justin  Mar 02, 2021 ]
When it says this will work in my mazda does that mean I can take out bose amp and put this amp in the same spot? I have a 2009 Mazda 6. I was looking at the Rockford Fosgate Punch PBR400X4D.
[ BRYAN  May 18, 2020 ]
3 answers
[ Kenneth  Mar 29, 2021 ]
This is a good amp, although I installed mine in a Subaru Legacy, I cannot tell you if it would fit in your Mazda.
[ JOHN  May 19, 2020 ]
The amp drives eight speakers in my PT Cruiser and I am adding two more Punch 6.5" speakers in enclosures tailored for the right and left foot panels. The important measurement is the amps' draw at peak.The subwoofers are self amplified or they would be questionable. One is 12" and the other is 10". Rockford Fosgate speakers compatable and balanced.when installed in pairs and Punch is both a good step up in performance and affordable. The next level is for one to two thousand watts, penthouse amplification, and blown ear drums. Actually, show competition is out of range financially. One winning set-up was a Pontiac Firebird with a $24,000 system.
[ Glenn  May 18, 2020 ]
Do these amps have built in protection circuits?
[ Pig meat  Oct 22, 2019 ]
3 answers
[ Kenneth  Mar 29, 2021 ]
Yes. You also need to use an external fuse.
[ Joe  Oct 22, 2019 ]
I'm not sure if it has an overhead protection, though every Fosgate Amp I've ever owned has. It does have LED lamps that illuminate when you're pushing into clipping.
[ matthew  Oct 22, 2019 ]

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