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

Rockford Fosgate Punch P400X4

400W Punch Series 4-Channel Stereo Class AB Car Power Amplifier (P400X.4)

In Stock. Only 1 Left!
|
dollar sign

Get A Better Value w/ Our Expert-Picked Bundles & Save:
Click Here To View All Deals!

List price $399.99

You Save: $137.50 (34.38%)

Thanks , You Pay:

$262.49

with warranty

+ FREE Shipping in US 48

Order within 17 hrs 37 mins to ship 5/31

Arrives by Thursday, June 2 to zip 20147

Add an Extended Warranty

SquareTrade Product Warranty
Fast, Free Shipping

Within the US 48

60-Day Money-Back

Hassle Free Returns

Low Price Guarantee

Seen it for less? Click here

365-Day Coverage

Warranty assistance for a year

In Stock. Only 1 Left!

Arrives by Thu, June 2

Item Added to Cart

Rockford Fosgate Punch P400X4

400W Punch Series 4-Channel Stereo Class AB Car Power Amplifier (P400X.4)

$262.49

Keep Shopping

Get Added Peace of Mind with SquareTrade

Why SquareTrade?

  • The #1-Rated Protection Plan
  • 5-Day Service Guarantee & Free Shipping
  • Protection from Normal, Everyday Use
You have added a warranty
$32.99
Add Warranty
3 years of protection

Rockford Fosgate RFK4 4-Gauge Wiring Kit

Get a matching Fosgate wiring kit for your new Fosgate amplifier! Don't forget the RCA's!

$71.97

Add
NVX Universal Remote Level Bass Control

Controls bass level and frequency via RCA/Interconnect connectors on any amp.

$7.99

Add
Kicker 4-Channel RCA Audio Interconnect Cable

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

$27.95

Add

Don't see the accessory you're looking for?
View all available accessories for the Rockford Fosgate Punch P400X4.

Get FAST answers from customers ASK a Question See questions answers

Bundled Savings with this Product

Get 20% off the Speaker to RCA Adapter with Purchase!

For a limited time - while supplies last - get an instant 20% off the Rockford Fosgate Speaker Level to RCA Output Adapter, used to integrate this amplifier with your factory system! This offer cannot be combined with any other coupons or offers.

1.60

67768

1999

Rockford Fosgate Punch P400X4

$262.49

+

20% OFF

Rockford Fosgate Speaker to RCA Adapter (RFIF2SW)

$7.98

Special Price $6.38 ($7.98 if purchased separately)

Rockford Fosgate Speaker to RCA Adapter (RFIF2SW)

• Speaker Line High Level Input To Female RCA Output Adapter
• Converts Factory (OEM) High Level Speaker Outputs into RCA Outputs for Use with an Aftermarket Amp

Save 20% on an RF Amp Kit and get an Extended Warranty!

Get 20% off an RFK4X install kit and receive an additional 1-year warranty on your Rockford Fosgate amplifier when purchased together. Simply click the "Add Both to Cart" button. This offer cannot be combined with any other coupons or offers.

19.60

67768

1304

Rockford Fosgate Punch P400X4

$262.49

+

20% OFF

Rockford Fosgate RFK4X

$97.99

Special Price $78.39 ($97.99 if purchased separately)

Rockford Fosgate RFK4X

• Complete 4 Gauge Amplifier Installation Kit with RCA Interconnect Cables
• 100% Pure Crystal Oxygen-Free Copper (PC-OFC)
• FULL Spec Cable Meets or Exceeds AWG (American Wire Gauge) Requirements

Save 20% on an RF Amp Kit and get an Extended Warranty!

Get 20% off an RFK4I install kit and receive an additional 1-year warranty on your Rockford Fosgate amplifier when purchased together. Simply click the "Add Both to Cart" button. This offer cannot be combined with any other coupons or offers.

16.00

67768

1301

Rockford Fosgate Punch P400X4

$262.49

+

20% OFF

Rockford Fosgate RFK4I

$79.99

Special Price $63.99 ($79.99 if purchased separately)

Rockford Fosgate RFK4I

• 4 Gauge Power and Signal Installation Kit
• 100% Pure Crystal-Oxygen Free Copper (PC-OFC)
• FULL Spec Cable Meets or Exceeds AWG (American Wire Gauge) Requirements
• Includes Appropriate Wire Termination Hardware

Save 5% on an RF Amp Kit and get an Extended Warranty!

Get 5% off an RFK4D install kit and receive an additional 1-year warranty on your Rockford Fosgate amplifier when purchased together. Simply click the "Add Both to Cart" button. This offer cannot be combined with any other coupons or offers.

5.75

67768

1299

Rockford Fosgate Punch P400X4

$262.49

+

5% OFF

Rockford Fosgate RFK4D

$114.99

Special Price $109.24 ($114.99 if purchased separately)

Rockford Fosgate RFK4D

• Dual Amplifier Complete 4 Gauge Amplifier Installation Amp Kit
• 100% Pure Crystal-Oxygen Free Copper (PC-OFC)
• FULL Spec Cable Meets or Exceeds AWG (American Wire Gauge) Requirements

Save 5% on an RF Amp Kit and get an Extended Warranty!

Get 5% off an RFK4 install kit and receive an additional 1-year warranty on your Rockford Fosgate amplifier when purchased together. Simply click the "Add Both to Cart" button. This offer cannot be combined with any other coupons or offers.

3.60

67768

1297

Rockford Fosgate Punch P400X4

$262.49

+

5% OFF

Rockford Fosgate RFK4

$71.97

Special Price $68.37 ($71.97 if purchased separately)

Rockford Fosgate RFK4

• 4 Gauge Amplifier Power Installation Kit
• 100% Pure Crystal-Oxygen Free Copper
• 17 ft 4 Gauge Power Wire
• 3 ft Ground Wire
• ANL/Maxi Fuse Holder & Fuse

Save 25% on an RF Amp Kit and get an Extended Warranty!

Get 25% off an RFK1D install kit and receive an additional 1-year warranty on your Rockford Fosgate amplifier when purchased together. Simply click the "Add Both to Cart" button. This offer cannot be combined with any other coupons or offers.

43.00

67768

1294

Rockford Fosgate Punch P400X4

$262.49

+

25% OFF

Rockford Fosgate RFK1D

$171.99

Special Price $128.99 ($171.99 if purchased separately)

Rockford Fosgate RFK1D

• 100% Pure Crystal-Oxygen Free Copper
• Designed specifically for 2400 watts+ car audio systems
• Includes appropriate wire termination hardware
• meets or exceeds AWG (American Wire Gauge) requirements

Save 50% on an RF Amp Kit and get an Extended Warranty!

Get 50% off an RFK8X install kit and receive an additional 1-year warranty on your Rockford Fosgate amplifier when purchased together. Simply click the "Add Both to Cart" button. This offer cannot be combined with any other coupons or offers.

30.00

67768

1291

Rockford Fosgate Punch P400X4

$262.49

+

50% OFF

Rockford Fosgate 8 Gauge Amp Kit (RFK8X)

$59.99

Special Price $29.99 ($59.99 if purchased separately)

Rockford Fosgate 8 Gauge Amp Kit (RFK8X)

• 8 Gauge Amplifier Installation Kit
• Includes RCA Interconnect Cables & 16 AWG Speaker wire
• Made from 100% Pure Crystal-Oxygen Free Copper
• Includes Wire Termination Hardware
• CEA-2015 Compliant

Save 530% on an RF Amp Kit and get an Extended Warranty!

Get 30% off an RFK8I install kit and receive an additional 1-year warranty on your Rockford Fosgate amplifier when purchased together. Simply click the "Add Both to Cart" button. This offer cannot be combined with any other coupons or offers.

15.00

67768

1290

Rockford Fosgate Punch P400X4

$262.49

+

30% OFF

Rockford Fosgate RFK8I

$49.99

Special Price $34.99 ($49.99 if purchased separately)

Rockford Fosgate RFK8I

• 8 Gauge Amplifier Installation Kit
• Includes RCA Interconnect Cables
• Made from 100% Pure Crystal-Oxygen Free Copper
• Includes Wire Termination Hardware
• CEA-2015 Compliant

Save 30% on an RF Amp Kit and get an Extended Warranty!

Get 30% off an RFK8 install kit and receive an additional 1-year warranty on your Rockford Fosgate amplifier when purchased together. Simply click the "Add Both to Cart" button. This offer cannot be combined with any other coupons or offers.

12.00

67768

1287

Rockford Fosgate Punch P400X4

$262.49

+

30% OFF

Rockford Fosgate 8 Gauge Amp Kit (RFK8)

$39.99

Special Price $27.99 ($39.99 if purchased separately)

Rockford Fosgate 8 Gauge Amp Kit (RFK8)

• 8 Gauge Amplifier Power Installation Kit
• 100% Pure Crystal-Oxygen Free Copper (PC-OFC)
• FULL Spec Cable Meets or Exceeds AWG (American Wire Gauge) Requirements
• Includes Appropriate Wire Termination Hardware

Get 10% off a RF License Plate & Deadskin Combo w/ Purchase!

For a limited time -while supplies last- get 10% of the Rockford Fosgate Black Powder Coated Stainless Steel License Plate Frame w/ 1 Sheet of Deadskin Bundle. This offer cannot be combined with other coupons or offers.

2.70

67768

1773

Rockford Fosgate Punch P400X4

$262.49

+

10% OFF

Rockford Fosgate RFDS-PLATE Sound Dampening License Plate Kit

$26.99

Special Price $24.29 ($26.99 if purchased separately)

Rockford Fosgate RFDS-PLATE Sound Dampening License Plate Kit

• (1) 3.3" X 10" Sheets
• Provides 40% more damping than standard non-embossed aluminum mat
• Silences panel vibration, reduces road and wind noise by up to 10dB over competition
• Butyl rubberbacking
• 1.5 mm thick

(Offer 1 of 10)

Combined Total Price

$268.87

You Save $1.60

Rockford Fosgate Audio Store

Feel the Punch!

The Punch P400X4 multi-channel amplifier is versatile to power any audio system configuration. In addition to 4-channel stereo mode, you can bridge both channels to create a high power 2-channel amp, or run stereo speakers on the front with subwoofers on the rear in 3-channel mode. The variable HP/LP crossover and built-in Punch EQ allows for precise tuning of Bass frequencies and the Pass-Thru RCA jacks provide flexibility as your system grows and keeping Y-adapters to a minimum.

General Features:

  • Rockford Fosgate Punch Series P400X4
  • Class-AB FullRange 2-Ohm Stable 4-Channel 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.
  • CEA-2006 Compliant Amplifier
  • Features C.L.E.A.N. Set-up with 10-step set-up procedure
    w/ input/output clip detection and indicator LEDs
  • Pulse Width Modulated MOSFET power supply
  • LED power (blue) and protect (red) indicators
  • Stealth top mounted control panel
  • Soft start turn-on
  • 4, 3 or 2 channel operation
  • Nickel-plated RCA level inputs
  • Nickel-plated captive C-clamp terminals
  • High level input capable with Auto Turn-On circuit (RFIF2SW required, sold separately. Up to TWO adapters needed for this amplifier.)
  • 3-way protection circuitry (thermal, overload, and speaker short protection)
  • On-board differential inputs eliminates noise picked up by the signal cable
  • 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
  • MESHA3 reduces MOSFET temperatures, lowers distortion, increases durability, and prolongs the output device life span
  • DSM (Discrete Surface Mounted Components) utilize 1% tight-tolerances improving efficiency of the circuit and lowers operating temperature and potential for noise - similar to circuit boards designed by aerospace manufacturers
  • Built in NOMAD is a "real time" analog computer that protects your amplifier from shorting speaker wires and dangerously low speaker impedances
  • Cast aluminum convection heatsink with DTM (Dynamic Thermal Management) evenly distributes excess heat across entire amplifier heatsink to efficiently keep the amplifier temperatures low
  • Input sensitivity: 150mV - 12V
  • Frequency Response: 20 - 20,000 Hz
  • Total Harmonic Distortion (THD): <1.0%
  • Signal to Noise Ration: 105dB
  • Selectable crossover modes: LP / AP / HP
  • Variable crossover filter: 50 - 250 Hz, 12 dB/octave
  • Variable Bass Boost, Punch EQ: 0 to +14 dB bass boost at 12.5kHz
  • Variable Bass Boost, Punch EQ: 0 to +18 dB bass boost at 45Hz
  • Fuse Rating: 60 A x 1 inline fuse recommended, not included
  • 8 - 18 gauge speaker wire connections
  • 4- 8 gauge power and ground wiring is recommended for installation. Contact us for information regarding a discount on select amplifier kits from our website when purchased together with this amplifier. Click Here for our contact information.
    • 8 Gauge is perfect for a full 4 ohm setup, while 4 Gauge is recommended for a full 2 ohm setup
  • Dimensions: 77.03"W x 7.76"L x 2.38"H
  • Authorized Internet Dealer
  • 1-year Manufacturer's Warranty

Product History:

Rockford Fosgate P400X4 thumbnail
(newest, current model)
Rockford Fosgate P4004 thumbnail
(previous model, replaced by Rockford Fosgate Punch P400X4)

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.
Punch (Rockford Fosgate)
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 Peak Power Output
The total peak power output is measured as the wattage per channel multiplied by the number of channels, and is calculated at the lowest level of operating impedance.

It is measured during a brief musical burst, such as a sudden drum accent. Some manufacturers display peak power ratings on the face of their products to increase the appeal.

The RMS power rating is more accurate, and we recommend using it for product comparison.

800 watts
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.
1.0%
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.
Optional (Requires Accessory Adapter)
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)
Full (AP)
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 - 250 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 - 250 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.
105 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.
No
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.
60A Fuse Recommended, Not Included
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.
No
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.
Not Tested

Warranty and Return Policy

Parts Warranty Duration
1 year
Labor Warranty Duration
1 year
Warranty Provider
Manufacturer

Summary of Customer Ratings & Reviews

Rating Distribution

5 Star
100%
4 Star
0%
3 Star
0%
2 Star
0%
1 Star
0%

Average Attribution Rating

Durability
4.8
Value
5.0
Features
4.8
Design
5.0
Usability
5.0
Kevin

Spartanburg, SC

Overall
Durability
Value
Features
Design
Usability
Great Buy!!

February 15, 2015

I purchased this amp to run 4 Pioneer TS-A6995R 6x9s in my 2002 Toyota Camry. I upgraded all my speakers from stock and purchased this amp & I've noticed a huge difference!! I love the settings this amp has to offer, sleek design, but most importantly, it's CEA-2006 Compliant. Normally rated at 400w RMS, my amp came rated at 568w RMS!! So at 4ohms, I'm pushing around 84.75w RMS per channel, which is how I have my speakers wired up. At 2ohms, it pushes around 142w RMS!! I would definitely recommend this amp to anyone looking to upgrade their stock speakers and need an amp that's gonna push!! Also, this amp was small enough for me to fit it on my backseat between my secondary battery and my other amp for my subwoofers.

18 of 21 found this helpful

Was this review helpful to you?

Mlo

Beltsville, MD

Overall
Durability
Value
Features
Design
Usability
Worth Every Penny

March 1, 2015

This amp provides outstanding power. I had the previous version and really liked it. This newer version is even better. A must have for anyone who enjoys quality in the sound of their music.

14 of 17 found this helpful

Was this review helpful to you?

michael

Longview, TX

Overall
Durability
Value
Features
Design
Usability
Good job Sonic Electronix

October 9, 2014

There is a reason Rockford Fosgate is still around and the products are CEA compliant.

14 of 17 found this helpful

Was this review helpful to you?

Todd

Center Valley, PA

Overall
Durability
Value
Features
Design
Usability
Awesome amp!

October 31, 2014

This amp is a great amp. It was a great buy and the built in clipping detector is awesome!. This amp I had on a set of rockford door speakers and the sound quality was amazing. The only thing is it doesn't have outputs. If your looking to get this I would recommend just getting the punch 600 4 channel so you got the extra power if you ever need it and it has outputs. If you don't need the outputs or the extra power this is still a great amp to buy and I recommend!

13 of 16 found this helpful

Was this review helpful to you?

los

kerrville,tx

Overall
Durability
Value
Features
Design
Usability
rockford p400×4

March 31, 2014

Product was as described fast service. Love the product sonic electronix

11 of 14 found this helpful

Was this review helpful to you?

Accessory Tools and Products

Accessories added

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 $71.97

Belva BAK44 4-Channel 4 Gauge Amplifier Installation Kit

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

Your Price $39.99

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 $109.99

NVX Universal Remote Level Bass Control

Controls bass level and frequency via RCA/Interconnect connectors on any amp.

Your Price $7.99

Universal Remote Bass Level Control Knob

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

Your Price $9.99

Kicker 4-Channel RCA Audio Interconnect Cable

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

Your Price $27.95

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 V-Series RCA Interconnect Cable

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

Your Price $26.99

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

StreetWires ZN9 Series Interconnect Cable

16.4 ft. of 4-Channel RCA Cable with Rhodium-plated contacts and ZeroNoise construction for clear signal transfer!

Your Price $99.95

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 $74.99

NVX XWS1625 16 AWG Speaker Wire

25 ft. of True 16 Gauge 100% Copper EnvyFlex Speaker Cable/Wire

Your Price $15.99

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

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

XS Power BIG3XS 100% OFC 1/0 Gauge Big 3 Upgrade Kit

1/0 AWG Big 3 Upgrade Kit with 100% OFC Wire for Audio Sytems up to 350 Amps

Your Price $99.99

270 Amp G Series Alternator for Select 1994-2012 GM Vehicles

Most Popular! 270+ amps at anything above 1800 rpm engine speed!

Your Price $449.00

240 Amp S Series Alternator for Select 1992-2003 Dodge/Jeep Vehicles

240 Amp cutting edge 6 phase hairpin epoxy reinforced stator technology

Your Price $399.00

240 Amp L Series Alternator for Select 1963-1985 GM Vehicles

Specifically designed to fit in tight spaces

Your Price $399.00

250 Amp Alternator for Select 2003-2008 Ford/Lincoln/Mercury Vehicles

Cutting edge 6 phase hairpin stator technology with Twin internal rectifier plates with finned heat sink

Your Price $399.99

240 Amp S Series Alternator for Select 1999-2006 Jeep Vehicles

6 phase alternators use less horsepower per Kilowatt than conventional 3 phase alternators

Your Price $399.00

240 Amp S Series Alternator for 2011 Toyota Corolla

Ultra precision balanced rotor with oversized charge post ensure sturdy cable connections

Your Price $399.99

240 Amp S Series Alternator for 2006-2011 Honda Civic

15% more efficient than typical alternators

Your Price $549.99

370 Amp E Series Alternator with Black Finish for Select 1994 - 2003 GM

WOW 370 AMPS! Elite series offers the highest possible amperage

Your Price $699.00

320 Amp S Series Alternator for Custom and Racing Applications

Great for a Custom Project

Your Price $499.00

XS Power D545

12-Volt Deep Cycle AGM Power Cell with 800 Max Amps

Your Price $109.99

NVX XCAP1F

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

Your Price $69.99

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

Innova Equus 3300 DMM

A must have tool for car installations (especially car security systems)

Your Price $17.99

NVX XTGSP2

Perfect for safely troubleshooting and testing audio systems

Your Price $29.99

SMD DD-1 Distortion Detector

Set your gains like a Pro, accurately and quickly

Your Price $149.99

SMD CC-1 Crossover Calibrator

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

Your Price $149.99

Scosche TK12

The perfect kit for installing a car stereo and amplifier for the first time

Your Price $16.99

Five Piece Installer's Panel Removal Tool Kit

Remove panels the right way (Durable Nylon Plastic Pry & Chisel Tool Set

Your Price $11.99

Universal Wire Puller

Make your installation less of a chore and save yourself the stretch

Your Price $7.99

8 Gauge Ring Terminals, 5/16" Opening

Nickel Plated Brass - 5 Pieces (3 Red & 2 Black)

Your Price $1.99

4 Gauge Ring Terminals, 5/16" Opening

Nickel Plated Brass - 5 Pieces (3 Red & 2 Black)

Your Price $4.99

0/1 Gauge Ring Terminals, 3/8" Opening

Nickel Plated Brass - 5 Pieces (3 Red & 2 Black)

Your Price $4.99

PRO Series Classic Short GM Battery Post Shoc-Krome

Side post battery adapter for GM type batteries (Positive or Negative)

Your Price $4.99

PRO Series Classic Long GM Battery Post w/ Shoc-Krome Plating

Side post battery adapter for GM type batteries (Positive or Negative)

Your Price $6.99

200 Amp Relay Isolator (BIR200)

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

Your Price $44.99

500 Amp Relay Isolator (BIR500)

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

Your Price $59.99

120 Amp 4-Post Battery Isolator

Prevents primary battery discharge and extends battery life

Your Price $69.97

240 AMP 3-Post Battery Isolator

Prevents primary battery discharge and extends battery life

Your Price $133.97

World's Smallest AFS / Mini ANL Fuse Holder

Accepts 4 gauge or 8-gauge wire

Your Price $12.99

4 Pack of 80 Amp Nickel-Plated MANL Fuse

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

Your Price $3.99

4 Pack of 100 Amp Nickel-Plated MANL Fuse

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

Your Price $3.99

4 Pack of 150 Amp Nickel-Plated MANL Fuse

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

Your Price $3.99

2 Pack of 100 Amp Nickel-Plated ANL Fuse

ANL 100A Nickel plated for better power transfer

Your Price $2.99

2 Pack of 200 Amp Nickel-Plated ANL Fuse

Two fuses per order. High quality 200 Amp ANL Fuses

Your Price $2.99

Gauge Reducer, 4 Gauge Input to 8 Gauge Pin

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

Your Price $8.99

Gauge Reducer, 1/0 Gauge Input to 4 Gauge Pin

Great for amplifiers that do not accept large gauge power wire

Your Price $8.99

XIX2025 Strapping RCA

0.25 Meter (0.86 ft) Hyper-Flex RCA cable w/ Serpentine-Cut Nickel Plated Connectors

Your Price $12.99

NVX VUBT2

Universal Bluetooth Audio Receiver

Your Price $29.99

NVX XUBT3

Universal Bluetooth Audio Receiver & Volume/Playback Controller Knob

Your Price $74.99

Items we think you might want
IM-SG main
Steve Meade Designs IM-SG

Impedance Meter/Signal Generator • Obtains Driver's T/S Parameters • Find Tuning Frequency of Passive Radiator • Locate Rattles in Vehicle

Your Price $299.99

RFI2SW main
Rockford Fosgate Speaker to RCA Adapter (RFI2SW)

• Speaker Line High Level Input To Male RCA Output Adapter
• Converts Factory (OEM) High Level Speaker Outputs into RCA Outputs for Use with an Aftermarket Amp

Your Price $7.99

Browse 2 questions and 10 answers
Hide answersShow all answers | Sort by
Why did you choose this?
Sonic Electronix Store
Knowledge of these components
David M on May 28, 2016
Great powerful amp got it powering 5" polk db speakers at 45 watts rms in my 1999 avalon and I'm happy with it no complaints here.
Jason T on Feb 17, 2015
I purchased this amp and I've had it over a year and it's still working just fine for me!! Gives my car life and it looks great!! Hasn't overheated for me at all!! Definitely worth the purchase!!
Kevin J on Mar 18, 2016
Awesome deal! Fastest delivery
Nicholas S on Jan 27, 2015
Is the bass knob/ gain remote required? Says optional bit after it says required and sold separately.
Scott A on Oct 23, 2015
Best Answer: Answer: Remote bass knob is not required. It's used for controlling the amp's volume level of the bass from the front of your vehicle instead of having to adjust the gain/input level knob (s) on the amp itself. This is useful when you have music that has different levels of bass and you don't want the base to overpower the mids and highs (the vocals).

My Additional Two Cents: I wouldn't advise that you use the P400X4 to power subs. It's a great amp for mids and highs though. If you do decide to use the amp to power subs, consider bridging the amp with two 4 ohm subs that handle about 300 RMS each or a single sub with a 4 ohm dual voice coil (DVC) then wire it to 2 ohms.
Reply (1) · Report · Nicholas S on Oct 24, 2015
· Add Answer · I Have This Question Too (0)

Product Summary

Manufacturer

Model Number

P400X4

UPC

780687342272

Weight

10.00lbs

Internal SKU

p400x4

Internal Product ID

67768

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 P400X4

  • 3Sixty3 Aftermarket Setup Wizard Tutorial
  • Rockford Fosgate Punch Car Amps | Powerful & Reliable Amplifiers
  • How To Install an Amplifier: Car Amplifier Basics Part 2