Expert Service 1-877-289-7664 [Hours]

Rockford Fosgate Punch P400-2

Punch Series Compact 2-Channel Amplifier

Discontinued
|

We apologize

This item has been discontinued

Get FAST answers from customers ASK a Question See questions answers

  • Punch Series 2-Channel Class AB Car Amplifier
  • RMS Power Rating:
    • 4 ohms: 100 watts x 2 chan.
    • 2 ohms: 200 watts x 2 chan.
    • Bridged, 4 ohms: 400 watts x 1 chan.
  • Dynamic Rockford PowerCube Rating: 468 watts
  • 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
  • 2/1 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.
  • RCA Pass-thru outputs
  • 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: 10.25"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 P400-2 thumbnail
(newest, current model)
Rockford Fosgate P4002 thumbnail
(previous model, replaced by Rockford Fosgate Punch P400-2)

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.

100 watts x 2 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.

200 watts x 2 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.

400 watts x 1 channels
Peak Power Output
This form of power rating refers to the maximum amount of power an electronic device can handle or output in an instant without damage occurring. Often times this maximum is achieved during a brief musical burst, such as a drum accent, or low bass hit.

Some manufacturers display peak power ratings on the face of their products to increase the appeal to consumers. The RMS power rating is more accurate, and we recommend using it for product comparison.

Not Specified

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.
2
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.
1 pair
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 
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
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.

Specials with this Item

Promotions
Promotions we have offer More Ways to Shop for items that are on clearance, last chance, special offer and sales, Made in America, and more!

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
96%
4 Star
0%
3 Star
4%
2 Star
0%
1 Star
0%

Average Attribution Rating

Durability
4.9
Value
4.8
Features
4.8
Design
4.9
Usability
4.9

Crumdug

Rockford, IL

Overall
Durability
Value
Features
Design
Usability

Beastly

October 4, 2012

I bought this amp to power my Alpine Type R component speakers. This amp is so clean, easy to set up and never gets hot no mater how loud I turn up my music. Granted I'm not bridging this amp for a sub so I'm not even using it to its full potential but I am more than satisfied for what I bought. I have complete confidence that this amp will last me for years. Rockford fosgate really knows their stuff. Excellent for powering a pair of high end speakers or maybe some entry level subs. I would recommend keeping it to 1 sub or 2 entry level subs. because bridged only makes up to about 500watts at 4 ohms. But it can handle any speakers and have perfect clarity!

0 of 0 found this helpful

Help our customers find the most helpful reviews

Justin

Guam

Overall
Durability
Value
Features
Design
Usability

Best little amp ever!!!!

September 4, 2012

I use this amp to power a single 10" RF power series sub in my 02' Altima and it hits really hard with plenty of power to spare. I turn up the music and can feel the bass in my face, chest, hair, etc. I would recommend this amp to anyone out there in need of some serious power for their subs!!!

0 of 0 found this helpful

Help our customers find the most helpful reviews

Dustin

St. Petersburg, FL

Overall
Durability
Value
Features
Design
Usability

GREAT AMP!

May 12, 2012

This is a great little amp. I've been using it for a year and a half now to power my 12inch kenwood sub and its really loud for just one 12 in my Jeep Cherokee. I have never had a single problem with it and it works fantastic. I recommend it to anyone.

0 of 0 found this helpful

Help our customers find the most helpful reviews

87' C10 Chevy

Alabama

Overall
Durability
Value
Features
Design
Usability

Great Price and Great Sound!

May 9, 2012

Good Power to push my 12" RF sub. Looks great to show off.

0 of 0 found this helpful

Help our customers find the most helpful reviews

Greg

Logan, UT

Overall
Durability
Value
Features
Design
Usability

Awesome amp!

April 15, 2012

I bought a boss amp and it crapped out after a couple months of use. Then i bought this amp and it bumps harder and lasts longer. I havent had any issues with it. Definitely worth the money.

0 of 0 found this helpful

Help our customers find the most helpful reviews

jeep

cabool mo

Overall
Durability
Value
Features
Design
Usability

great by

November 29, 2011

I have this 400-2 running 4 JL WX 10's with an Absolute 3.5 farad capacitor in a Jeep XJ with a custom box. It is very loud!

0 of 0 found this helpful

Help our customers find the most helpful reviews

JB

Bronx, NY

Overall
Durability
Value
Features
Design
Usability

Awesome amp

July 15, 2011

Got this amp used and it is a very powerful little amp. I love how small it is. Whoever buys this amp will NOT be disappointed. This amp has some serious power !!

0 of 0 found this helpful

Help our customers find the most helpful reviews

Jim

Old Saybrook, CT

Overall
Durability
Value
Features
Design
Usability

Very nice

July 1, 2011

Powers my MTX magnum 10's perfectly and bumps like hell. Much more clear and crisp than my old amp and it also runs pretty cool compared to my last one as well. Well worth the money, perfect for powering 2 10's

0 of 0 found this helpful

Help our customers find the most helpful reviews

MICHAEL

DORAL, FL

Overall
Durability
Value
Features
Design
Usability

Power House

May 28, 2011

I would recommend this product because it has lot's of power clarity and Sonic control included in one package

0 of 0 found this helpful

Help our customers find the most helpful reviews

Sean

Seattle, WA

Overall
Durability
Value
Features
Design
Usability

WOW Impressed

March 25, 2011

I recently used this amp to replace a JBL BP600.1 I had powering 2 12 inch RF P3s. I thought the JBL slammed but on a whim I decided to hook up this just to see and wow sounds just as powerful but more of a clean sound. 600 RMS from JBL doesn't sound better than 400 RMS from RF go figure. I love Fosgate and have been using there equipment for a decade. Can't wait to replace this with P1000-BD now!

0 of 0 found this helpful

Help our customers find the most helpful reviews

High Ryder

Gray, Ga

Overall
Durability
Value
Features
Design
Usability

Excellent choice

March 21, 2011

I'm very satisfied with my purchase the P400-2 is a great amp wit a good quality sound! I love it

0 of 0 found this helpful

Help our customers find the most helpful reviews

High Ryder

Gray, Ga

Overall
Durability
Value
Features
Design
Usability

Excellent choice

March 21, 2011

I'm very satisfied with my purchase the P400-2 is a great amp wit a good quality sound! I love it

0 of 0 found this helpful

Help our customers find the most helpful reviews

stretch

West Plains, MO

Overall
Durability
Value
Features
Design
Usability

AWESOME

March 9, 2011

This is an awesome amp. I have it paired up with a Boston Acoustics G3 12 single 4 ohm, and it hits HARD and CLEAN. I did cheap out at first and got a Visonik amp, but when ever I saved up enough this thing was WELL worth it. They both claim to be 400 watts rms bridged, but the difference is night and day. It hit sooo much harder and it just over all sounds better. I can go twice as loud with no distortion. I highly would recomend this and any other Rockford amp to anyone. (And if u get one, look at the birthsheet for a nice little surprise, Rockfords one of the few company's who under rates their prooducts) oh and Sonic did an awesome job, cheap prices, on time delivery.

0 of 0 found this helpful

Help our customers find the most helpful reviews

Monte

Mount Vernon, WA

Overall
Durability
Value
Features
Design
Usability

Performs Well!

March 2, 2011

I paired this amp with a MTX Audio Thunderform DDQC10U and MTX tt6510-04 sub. The combo sound great in my Dodge Dakota pickup, very happy. This amp is a pretty small footprint, but provides plenty of power!

0 of 0 found this helpful

Help our customers find the most helpful reviews

Derek L

Johnstown PA

Overall
Durability
Value
Features
Design
Usability

I love this amp

November 15, 2010

I bought a Rockford Fosgate amp from Sonic Electronix it was the best customer service I have ever received from anywhere...the transaction went very smooth and they went above and beyond the call of duty and the amp arrived very quickly and i was very pleased with it.....it packs a punch and drives my subs very nicely I highly reccomend this amp if your looking for great clean deep bass this is the amp for you!!!!

0 of 0 found this helpful

Help our customers find the most helpful reviews

Chris

Australia

Overall
Durability
Value
Features
Design
Usability

great power

August 5, 2010

more than happy with this amplifier. It's rated at 2x 100wrms @ 4ohms, it birthed at 2x 149wrms @ 4ohms. Massive power from such a small amp. Bridged into 1 channel @ 4ohms its putting out 498 watts RMS!! amazing little thing

0 of 0 found this helpful

Help our customers find the most helpful reviews

jake

aurora, IL

Overall
Durability
Value
Features
Design
Usability

Perfect Fit!!

May 5, 2010

I own an S2000 and was looking for a good quality amp to fit under my passenger seat. This amp was a perfect fit! I left a few extra inches of rca and power cables so i can pull the amp out from underneath the seat and make any necessary adjustments. I have previous experience with Rockford Fosgate and have never been disappointed. If you own an S2000 or any other car where space is a concern than this amp is the only way to go!

0 of 0 found this helpful

Help our customers find the most helpful reviews

Taylor

Lusby, MD

Overall
Durability
Value
Features
Design
Usability

the greatest.lol

February 23, 2010

i just got this amp today and opened the box with a ton of satisfaction. birthsheet reads: -RMS 152 x 2 @ 4ohm 249 x 2 @ 2ohm 497 x 1 @ 4ohm -MAX 1491 watts now that what i call an amp. cant go wrong with Rockford Fosgate. great product!

0 of 0 found this helpful

Help our customers find the most helpful reviews

Ice

gilbert,az

Overall
Durability
Value
Features
Design
Usability

Sick

February 20, 2010

This thing fits almost anywhere. Its an addition to my other amp that runs my 2 Kicker subs (P-10002, hell of an amp) This one is to run my components. Sucks doesn't come with a remote tho. Rockford also has the best customer support/service that I have ever used!!!!!!! Rest assured, you'll get your monies worth and then some!

0 of 0 found this helpful

Help our customers find the most helpful reviews

chris

Lexington, TN

Overall
Durability
Value
Features
Design
Usability

wow!

February 1, 2010

this amp is wonderful! i have it installed in my boat running some kicker tower components and it does the job and then some. i really like rockford amps cause they are way under rated and you will know when you get the birth sheet what i mean.

0 of 0 found this helpful

Help our customers find the most helpful reviews

Accessory Tools and Products

Accessories added

NVX XBG3PK 1/0 Gauge OFC Big 3 Upgrade Kit

Comes with everything you need to upgrade your power and ground wire.

Your Price $79.99

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

Professional Installation for your Car Power Amplifier

Covers labor charges through our professional installer network.

Your Price $89.99

NVX XIV25 V-Series 2-Channel RCA Cable

16.4 ft 2-Channel RCA Audio Interconnect Cable with Twisted Pair Construction

Your Price $11.99

Kicker KI24 K-Series RCA Audio Interconnect Cable

4 Meters (13 ft.) 2-Channel K-Series RCA Audio Interconnect Cable

Your Price $16.95

NVX XWS1225 12 AWG Speaker Wire

25 ft. of True 12 Gauge 100% Copper EnvyFlex Speaker Cable/Wire

Your Price $39.99

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

SMD DD-1 Distortion Detector

Set the gain of an audio amplifier quickly and accurately

Your Price $149.99

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

Hide answersShow all answers | Sort by
No questions have been asked about this item. Be the first!

Product Summary

Manufacturer

Model Number

P400-2

UPC

780687326876

Weight

9.00lbs

Internal SKU

p400-2

Internal Product ID

9851

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 P400-2