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Rockford Fosgate Punch P400-4

400W RMS Punch Series Compact 4-Channel Amplifier

Discontinued
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This item has been discontinued

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General Features:

  • Punch Series 4-Channel Class AB Car Amplifier
  • RMS Power Rating:
    • 4 ohms: 50 watts x 4 chan.
    • 2 ohms: 100 watts x 4 chan.
    • Bridged, 4 ohms: 200 watts x 2 chan.
  • MOSFET power supply
  • Remote bass level input (remote level control sold separately)
  • LED power, thermal, and protect indicators
  • Tuned Bass EQ (0-18 dB bass boost at 45 Hz or 0-12 dB bass boost at 12 kHz depending on crossover selection)
  • On-board differential inputs eliminates noise picked up by the signal cable
  • 4/2 channel operation
  • Integrated Trans•ana technology simplifies the signal path of the amplifier allowing the signal to travel through the amplifier at a lower voltage. The result is greater reliability and exceptional sound quality.
  • Featured custom designed TO-247 MOSFETs have 60% more metal tab area providing more power handling capacity, lower impedance and improved heat dissipation over traditional TO-220 MOSFETs found in most competitor's amps.
  • Built in NOMAD is a "real time" analog computer that protects your amplifier from shorting speaker wires and dangerously low speaker impedances.
  • Cast aluminum heatsink evenly distributes excess heat across entire amplifier heatsink
  • Nickel-plated RCA level inputs
  • Nickel-plated screw terminals
  • Variable high-pass filter (50-500 Hz, 12 dB/octave)
  • Variable low-pass filter (50-500 Hz, 12 dB/octave)
  • CEA-2006 compliant amplifier
  • Frequency response: 20-20000 Hz
  • Dimensions: 13.02"L x 7.625"W x 2.25"H
  • 4-gauge power and ground leads recommended. Contact us for information regarding a discount on a select amplifier kit when purchased together.
  • 1-year SonicElectronix.com warranty

Product History:

Rockford Fosgate P400-4 thumbnail
(newest, current model)
Rockford Fosgate P4004 thumbnail
(previous model, replaced by Rockford Fosgate Punch P400-4)

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.

50 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
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.
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.
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.
0.05%
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)
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 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.
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
Fuse Rating
The amperage and the number of fuse(s) an amp requires.
80A x 1 
Strappable
Some amplifiers can be "strapped" together in order to increase the output of a single audio channel. These amplifiers feature RCA preamp outputs, allowing you to pass the signal directly from one amp to the other to ensure consistency.
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
Sonic Certified Amplifier
Sonic Certified amplifiers have been tested by the experts at Sonic Electronix to meet or exceed the wattage ratings provided by the manufacturer. If this is marked as Yes, then you can trust the wattage ratings. If marked as No, then we have tested the amplifier and it did not meet the advertised wattage ratings. If marked as Not Tested, then the Sonic Electronix experts have not yet been able to test the amp.

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
23%
3 Star
0%
2 Star
0%
1 Star
0%

Average Attribution Rating

Durability
4.8
Value
4.7
Features
4.5
Design
4.7
Usability
4.6
Mod

CR,WA

Overall
Durability
Value
Features
Design
Usability
Rockford wins!!

January 9, 2011

I have had Rockford amps in almost all of my vehicles since the late 80's and they have never let me down as far as sound quality and adjustability of levels. This new Punch 400x4 channel amp fills the bill quite well for those looking for a bit more power for under $300. Slim chassis design does not take up any space at all, it fit perfectly under my passenger seat with room to spare. It is running four door speakers on two channels and one 10" sub on the other two, and it hasn't even got warm at the highest levels.

Thank you Sonic for the excellent customer service and instant shipping.

4 of 4 found this helpful

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Devin

Nashville, NC

Overall
Durability
Value
Features
Design
Usability
plenty of power to spare

January 19, 2013

i have this installed in a 92 chevy camaro running infinity 4x6 plates in the front and kenwood 5-way 6x9s in the rear. it is plenty of power and it keeps them clean, just took a little while to get it tuned the way i like.

0 of 0 found this helpful

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Justin

Guam

Overall
Durability
Value
Features
Design
Usability
Best Brand Ever!!!

September 4, 2012

Ive recently installed this amplifier to power a set of Infinity Reference Series 5 1/4 components as well as Infinity Reference 6 x 9 2 way speakers and I am very satisfied with my purchase. This amplifier delivers clear, crisp, quality sound that i havent heard in a long time. Even after powering my speakers to the point where my ears have a slight ringing sound, theres still power to spare. I would recommend this brand of amps to any audio enthusiast. The look and design may not be as visually appealing as other amps on the market but then again its not the looks that give your speakers sound. The plastic cover gives it a feeling of being cheaply made. It has all the features an amp needs. And its really easy to use. Overall great product!!!

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T-Mac

Texas

Overall
Durability
Value
Features
Design
Usability
Excellent

July 3, 2012

This amp has been an excellent addition to my system. It puts out a ton of clean power. It puts out much more power than what it is initially rated at. I believe in Fosgate Amps! The only gripe I would mention, albeit a small one, is the fact that the gain and crossover settings are very tiny, plastic, and recessed into the amp. This makes it a bit of a pain to adjust settings but you get used to it after while. I have had no mechanical or sound issues with it. Overall, love it!!

0 of 0 found this helpful

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808Mag

Kona, HI

Overall
Durability
Value
Features
Design
Usability
Power to spare SQ to be desired

April 13, 2012

This thing is a beast makes my Polk DB Tweeters scream! My Boston 5x7's and Pioneer 6x8's hit like subwoofers in my Mazda 3. I have the gains set at less than half.

It's also built like a tank and is plenty loud. I had to do some tuning with the Crossovers and Punch EQ to get it to sound more natural. The power this thing has makes it very easy to pickup distortion as well as electrical noise. I had to re-route my RCA's to elimate the noise that this thing picked up. I had a Kenwood 4ch amp before this one and it didnt pickup any noise with the wiring in the same place.

In conclusion I think this unit is a very good choice to go LOUD with decent Sound quality and compact size but there are other units that will sound as loud with bett SQ.

0 of 0 found this helpful

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Tony

Canada

Overall
Durability
Value
Features
Design
Usability
Excellent Amplifier

February 12, 2012

I have always used Rockford Fosgate it has never let me down, this amplifier sounds great as all the other Rockford Fosgate amplifier's that I have owned in the past.

0 of 0 found this helpful

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John

Silsbee, Texas

Overall
Durability
Value
Features
Design
Usability
Good but slightly inconvenient at first...

December 31, 2011

This amp will push plenty of power to your speakers but I wouldn't use the punch series speakers with this amp because the mids drown everything out and distort a little sometimes. I had my hp set to 125 for front and 110 for my rear speakers, everything sounds really clear and edgy but not as full and smooth as I like, I just don't think the crossover gives you a convenient way to tune everything so I use pioneer speakers for extra bass and a smoother range of frequencies. If I was to replace this amp, I'd probably buy a kenwood, but I'd look into speaker replacements first, there's nothing wrong with this amp. Note I paid around $350 for this amp in an audio shop.

0 of 0 found this helpful

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Buddy Lee

Lawton, OK

Overall
Durability
Value
Features
Design
Usability
Great as always

December 23, 2011

I have been running Fosgate amps since I first got into stereos in the early 1990s. I have owned about fourteen Fosgate amps and only had problems with two of them, one was my fault for overheating it because I had my sub box sitting on the amp and the other blew for unknown reasons but both were under warranty and replaced for only the cost of shipping to Fosgate. I have this 400.4 pushing four 6.5" Kicker marine co-axials in my pontoon boat. Prior to this amp, I had them running off of an old Punch 40 (20 year old amp still working) and they sounded very good, but the 400.4 really brought them to life with increased midbass and much brighter highs. I believe the birth sheet said it runs about 75 watts per channel at 4 ohm. I also have on older model of this amp which is much larger that has been running almost 10 years strong.

0 of 0 found this helpful

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scott

parma, OH

Overall
Durability
Value
Features
Design
Usability
Great

October 23, 2011

Great amp very powerful I have it powering the infinity kappa component 6.5 and jvc 6x9s and they sound great with it turned only half way up and there more then loud enough with a Very clean crisp singnal being sent out I would definetly recommend this amp.

0 of 0 found this helpful

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Colton

Vancleave, MS

Overall
Durability
Value
Features
Design
Usability
Great amp

December 14, 2010

This amp was suppose to be 50 x 4. When I got it the birth sheet read 76x4 so I'm not complaining. This is such a great amp and underrated. Well worth the value. Pushes my Rockford punch 6x9s and 6 1/2 jbl component set

0 of 0 found this helpful

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NSX FANATIC

DETROIT, MI

Overall
Durability
Value
Features
Design
Usability
Rockford Fosgate P400-4

November 15, 2010

I wanted a quality amp that had the features I needed in a small package, ie, bass, treble, multi-channel.. I've always wanted a Rockford amp so I decided to go with this model. So far so good, It's living up to all my expectations..

0 of 0 found this helpful

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Tom

Derby Ct.

Overall
Durability
Value
Features
Design
Usability
Rockford Fosgate Punch P400-4

October 15, 2010

Great Amp, awesome power, can't beat the price for what you get, I have two older 2 channel Fosgate amps and this amp kick's butt just like the others do!!

0 of 0 found this helpful

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Arturo

Sierra Vista, AZ

Overall
Durability
Value
Features
Design
Usability
Worth The $

October 5, 2010

first off Fosgate amps in my experience have always worked great and last forever. There usually a little more expensive than others who claim to have the same rms but there always worth it. This amp works great for subs or speakers. the only thing they could have done to make this amp better is make it look a little cooler but performance wise absolutely flawless!

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Willy

Alexandria, LA

Overall
Durability
Value
Features
Design
Usability
HITS HARD

September 19, 2010

i had this amp with a 1 gauge wire hooked up to 1 12" Rockford T1 bridged two of the channels to it. and the other two channels i had 2 10" P1's and the setup would make my jeeps hard top go in and out over an inch. great amp!!! sounded amazing also!

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mike

baton rouge

Overall
Durability
Value
Features
Design
Usability
Excellent

August 11, 2010

fast shipping, great communicator, authentic product, and most important.. trustworthy.

0 of 0 found this helpful

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Andrew

Phoenix, AZ

Overall
Durability
Value
Features
Design
Usability
Good amp

July 7, 2010

Great, clean sounding amp. Purchased in December of 2009 to drive mid-range and highs. After owning older Punch amps from the 90's, I anticipated the high and low Punch EQ controls to be separate adjustments. But on this amp there is only one adjustment, for both bass and treble. Using a high-pass crossover setting around 100 Hz, the mid-bass gets over-driven too much by the Punch bass boost, while trying to boost the treble. It sounds to me as though the Punch bass EQ does not get defeated by the high-pass crossover. I would prefer separate controls for the bass and treble boosting.

0 of 0 found this helpful

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Wildrat

Clearwater Mountains, Florida

Overall
Durability
Value
Features
Design
Usability
Works

April 27, 2010

These units were installed on two Harley Baggers along with Polk Audio 6X9 on the bag lids and 5 1/4 speakers in the OEM mounting spots. The system sounds great and has plenty of power for the bikes. Would buy all these products again and would buy from Sonic again and have.

0 of 0 found this helpful

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KB

Canada

Overall
Durability
Value
Features
Design
Usability
Great Buy

March 9, 2010

Good combo for the infinity kappa series speakers (2ohms) crisp and clean, not to mention very loud. Got a T2 set up to a t1000 and this set up to the kappa 6.5 inch components and 6x9 amazing sound.

0 of 0 found this helpful

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patrick

OH

Overall
Durability
Value
Features
Design
Usability
good

January 2, 2010

needs better control over frequency is the cons
pros would be it actually puts out 76watts rms x4 at 4 ohm, 126watts rms x4 at 2 ohm, 256watts rms x2 at 4 ohm bridged

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Stereoman

Acton, MA

Overall
Durability
Value
Features
Design
Usability
Pretty good

December 15, 2009

A little more power from this would be nice. But super clear and beautiful looking.

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 $151.99

Belva BBG3KT CCA 1/0 Gauge Big Three Kit

Features everything needed to upgrade factory power and ground wire.

Your Price $39.99

JL Audio HD-RLC

Remote Level Control for Select JL Audio Amplifiers

Your Price $29.99

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 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

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 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 $99.99

Scosche SPL Meter SPL1000F

Handheld boomSTICK measures your SPL range from 60 to 135 dB

Your Price $21.99

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Product Summary

Manufacturer

Model Number

P400-4

UPC

780687326883

Weight

12.00lbs

Internal SKU

p400-4

Internal Product ID

9893

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 Punch P400-4