Heat is the enemy of all amplifiers — sucking power away from your music and damaging internal components over time. Rockford Fosgate came up with some clever innovations that lower the heat generated in these Class D Punch amplifiers, improving efficiency and reducing their size so they can fit in almost any vehicle.

Punch performance
The 4-channel Punch P500X4D amplifier sends 75 watts RMS to each of your front and rear speakers, giving you the crystal-clear power you need to hear the full impact of your music. You can also put the amp into 2-channel mode to drive a couple of subs with 250 watts RMS each. Separate front and rear frequency filters give you razor-sharp control over your speakers' clarity, while the onboard Punch EQ bass boost allows you to reinforce your music's low end when you're using a sub.

Small and cool
This versatile amp utilizes full-range Class D amp technology, drawing much less current from your car's electrical system than traditional amps, and generating tons of power from a remarkably compact chassis. Rockford Fosgate builds this amp using precision components assembled by high-speed, super-accurate robots — this Discrete Surface Mount system results in less interference between parts, lower operating temperature, and increased life for the amplifier. An amplifier that's built to last, packed with power, and fits almost anywhere — what more could you want for your music?

Product Highlights:

  • 4-channel car amplifier
  • 75 watts RMS x 4 at 4 ohms (125 watts RMS x 4 at 2 ohms)
  • 250 watts RMS x 2 bridged output at 4 ohms (4-ohm stable in bridged mode)
  • CEA-2006 compliant
  • separate variable high- and low-pass filters (50-500 Hz, 12 dB/octave) for front and rear channels
  • separate variable bass boosts (0-18 dB at 45 Hz) for front and rear channels
  • full-range Class-D amplifier design
  • Discrete Surface Mount construction
  • 4-gauge power and ground leads and an 60-amp fuse recommended — wiring and hardware not included with amplifier
  • no onboard fuses — when installing multiple amps in a system, an additional 60-amp in-line fuse between the distribution block and the amplifier is recommended
  • 10-3/4"W x 2-3/16"H x 8-5/16"D
  • warranty: 1 year
  • Our 60-day money-back guarantee

My system has plenty of power. Who needs an amp?

You might think you don't need an amp because you have a 400-watt system in your car, or because your new stereo puts out 50 watts a channel. But those are peak wattage ratings, which may boil down to 15 or 20 watts per channel, using the more realistic RMS rating. An amp sends your speakers the power they need to deliver your music with clarity and impact, whether you're using factory speakers or high-performance components. And low-frequency reproduction requires lots of power, so an amp is an absolute must if you're adding a sub to your system.

Hands-on research

What's in the box?

Download owner's manual

  • 4-Channel amplifier
  • 2mm Hex key
  • 4mm Hex key
  • 4 Self-tapping screws (length=1.5")
  • Installation & Operation Manual (Eng / Spa / Fre / Ita / Ger)

Product Research

Features
Controls
Connections

Features

Overview: The Rockford Fosgate P500X4D is a 4x75-watt, Class-D, full-range, 4-channel amplifier. Class-D amplifiers are very efficient, which reduces current consumption from the vehicle's charging system.

Cast Aluminum Heatsink: The cast aluminum heatsink dissipates heat generated by the amplifier's circuitry. The inherent advantage of casting provides a 30% improvement of cooling over conventional extrusion heatsink designs.

DSM (Discrete Surface Mount): In the manufacturing process high speed robotics are used to place 1% tolerance parts and large board traces. DSM improves the efficiency of the circuit, decreases cross-talk from other discrete components and lowers operating temperature.

Power and Protection LEDs: Power and Protection LEDs are located on top of the amplifier. The Power LED glows red when the amplifier is turned on. The Protect LED illuminates yellow if a short circuit or too low an impedance is detected at the speaker connections. When any of the protection circuits engage, the amp automatically shuts down until the problem is corrected.

Controls

Control Panel: The P500X4D has top-mounted controls, covered by a removable panel. There are independent controls for the front and rear channels, and include the following:

  • Internal Crossovers: Each crossover can be set for high-pass, low-pass, or all-pass (full range) operation by a 3-way switch. The cut-off frequency is continuously variable from 50Hz to 500Hz, and has a slope of 12dB per octave.
  • Punch EQ: The Punch EQ can supplement low frequencies to give your music more impact and presence. The Punch EQ becomes active only when the crossover switch is set to low-pass, providing a bass boost of 0-18 dB at 45 Hz.
  • Gain: You can match the output of the connected source unit using the rotary gain control. The gain control can be set between 0 and 11.

2/4 CH Switch: On the front of the amplifier, you can switch the inputs to a 2-channel or 4-channel mode. When using only one pair of inputs, you can feed all 4 output channels by pressing in the 2/4 CH switch.

Connections

Power Connections: The power and ground terminals are nickel-plated set-screw wire connectors and will accommodate up to 4-gauge wire. An external 60-amp fuse (not included) must be installed on the power wire within 18 inches of the battery. If a wiring kit is used which includes a fuse with a value other than 60-amps, the original should be replaced with a 60-amp fuse. The remote turn-on terminal will accept wire sizes of up to 12 AWG. The supplied 2 mm and 4mm hex keys is required to tighten/loosen the terminals.

Differential Input: Differential input circuitry measures the voltage of both the positive (+) and negative (-) portions of the input signal, subtracting the voltage common to both conductors (noise), resulting in a cleaner signal. Reducing the noise on the input then improves the sound quality of the output.

Speaker Connections: The 4-channel nickel-plated set-screw wire connectors will accept up to 8-gauge wire. The supplied 2mm hex key is required to tighten/loosen the terminals.

Our Product Research Team

At Crutchfield, you'll get detailed, accurate information that's hard to find elsewhere. That's because we have our own in-house Product Research team — they open the box, verify contents, check the owner's manual, and record dimensions, features and specs. We stay on top of new products and technologies to help people make informed choices.

Rockford Fosgate Punch P500X4D Reviews

Average Customer Review:

6 reviews
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Rockford Amp

Written By JerryP, Massillon, Oh on Monday, April 29, 2013

Crutchfield Customer Review (What's this?)

Amp was easy to hook and is working great. Plenty of power to drive my four speakers

Pros: Looks great, works better

Cons: None

Great Amp

Written By Chicano 310, Torrance, CA on Sunday, April 14, 2013

Crutchfield Customer Review (What's this?)

Great amp! Had it installed for over a month pushing 2 12's and 2 6x9's and it gives my 12's that punch it needs for a good bass.

Great Amp

Written By Anonymous, Colusa,Ca on Sunday, April 07, 2013

Crutchfield Customer Review (What's this?)

This works great doesn't give me any problems what so ever

Pros: Everything

Cons: Nothing

RF Knockout!

Written By Deejay Kazz, Colorado Springs, CO on Sunday, March 03, 2013

Crutchfield Customer Review (What's this?)

I bought this baby as an open box for less than the current sale price that is currently on at Crutchfield and it is worth every penny! I got a custom fiberglass sealed box made and installed with (2) JBL GTO804's to go under my back cab bench of my 2013 F150 and they only needed 1/2 the amp to run it leaving me the other 1/2 to run the (4) Polk db 571 on the doors when I am ready to "upgrade" The current amp of my Ford sync OEM is plenty for the db 571's for now though. I just bought the truck brand new and didn't want to mess with the OEM setup yet.

Pros: Awesome Power with flexible capabilities!...

Cons: None as of yet (but do not foresee any). Just got it installed a few days ago.

Rockford Rocks!

Written By Bruan, Spring Hill, FL. on Monday, November 26, 2012

Crutchfield Customer Review (What's this?)

The amp showed up in excellent condition and in a timely manor. Haven't had a chance to use the amp yet, but I'm sure it's fine. Bought it to push 2 sets if components. Birth certificate said 648 watts. Rockford Fosgate amplifiers are the best Crutchfield has to offer. Costly but you get what you pay for. Will be buying more to finish my 5000 watt install.

Pros: Quality

Cons: Cost

Punch 500

Written By Keith, Marrero, LA on Saturday, February 04, 2012

Crutchfield Customer Review (What's this?)

This amp is an example of the evolution of Fosgate amps over the years. Back when I had my first one, the Punch 100, it had only a crossover. This amp has pass thru RCA inputs, gain controls, cross overs & bass boost. I am using it to power some 2 ohn Infinity Kappa seriess speakers, and it's really clean.

Pros: Features are great. Sound is there as it's putting out 500 watts into the 2 ohm speakers (4 x 125). Once you get it tuned, it's like the commercial: "Set it & forget it."

Cons: Just a bit thick as to where I lost my fold up seat option in the back of the F-150 Super Crew when I mounted it on a board behind the rear seat.

Get everything you’ll need to enjoy your new Rockford Fosgate Punch P500X4D

You'll need an amp wiring kit to install your new amplifier, as wiring is not included.
Bring the music from your amp to your speakers.
Patch cables take the music from your stereo to the amplifier. Most amp wiring kits don't include them.
Add a remote and control your amp from the driver's seat.
For multi-amp systems, you'll need a separate fuse holder.
Helps protect your car's charging system and improves power handling. Required power and ground wires not included with cap.
The right tools will make the installation easier.
Rockford Fosgate RFK4

Rockford Fosgate RFK4

4-gauge amplifier power wiring kit

Item #: 575RFK4

(10)

$114.99
Add to Cart
Rockford Fosgate RFK4X

Rockford Fosgate RFK4X

Complete 4-gauge amplifier wiring kit
Includes patch cable and speaker wire

Item #: 575RFK4X

(12)

$159.99
Add to Cart
EFX PA4BX Wiring Kit

EFX PA4BX Wiring Kit

4-gauge amplifier wiring kit — includes 2-channel patch cable

Item #: 142PA4BX

(6)

$79.99
Add to Cart
Kicker PK4

Kicker PK4

4-gauge amplifier power wiring kit

Item #: 206PK4

$129.99
Add to Cart
T-Spec 16-gauge Speaker Wire

T-Spec 16-gauge Speaker Wire

Black/white jacket — priced per foot

Item #: 120SW16WB1

(13)

T-Spec 12-gauge Speaker Wire

T-Spec 12-gauge Speaker Wire

Black/white jacket — priced per foot

Item #: 120SW12WB1

(30)

Stinger PRO Series Speaker Wire

Stinger PRO Series Speaker Wire

Priced per foot (16 Gauge)

Item #: 541SPW516B

(52)

JL Audio XD-CLRAIC2-SW

JL Audio XD-CLRAIC2-SW

2-channel speaker output converter (bare speaker wires to male RCAs)

Item #: 136XDCLR2S

(12)

Kicker KISL

Kicker KISL

2-channel speaker wire adapter (bare-wire connector to RCAs)

Item #: 206KISL

(15)

$12.99
Add to Cart
T-Spec 2-Channel RCA Patch Cables

T-Spec 2-Channel RCA Patch Cables

Available in 7 different lengths (17-foot)

Item #: 120RCA172

(27)

$19.99
Add to Cart
T-Spec 4-Channel RCA Patch Cable

T-Spec 4-Channel RCA Patch Cable

17-foot length

Item #: 120RCA174

(8)

$29.99
Add to Cart
EFX 17-foot RCA Patch Cable

EFX 17-foot RCA Patch Cable

Item #: 142A17C

(55)

$7.99
After $2.00 Savings Add to Cart
EFX 2-Channel RCA Patch Cables

EFX 2-Channel RCA Patch Cables

Reference Series Multi-Core RCA patch cables — available in 5 different lengths (25-foot)

Item #: 142RR25

$31.95
Add to Cart
EFX 2-Channel RCA Patch Cables

EFX 2-Channel RCA Patch Cables

Elite Series Braided Multi-Core RCA patch cables — available in 5 different lengths (6-foot)

Item #: 142RE6

$49.95
Add to Cart
EFX 2-Channel RCA Patch Cables

EFX 2-Channel RCA Patch Cables

Core Series Twisted RCA patch cables — available in 5 different lengths (17-foot)

Item #: 142RCT17B

$12.95
Add to Cart
Rockford Fosgate PEQ Amp Remote Control

Rockford Fosgate PEQ Amp Remote Control

For 2007-up Power and Punch Series amps

Item #: 575ROCKPEQ

(22)

$29.99
Add to Cart
Rockford Fosgate RFFAGU Fuse Holder

Rockford Fosgate RFFAGU Fuse Holder

Platinum-plated AGU fuse holder
Fits 4- or 8-gauge cable

Item #: 575RFFAGU

(25)

$10.99
Add to Cart
EFX CFHG4 Fuse Holder

EFX CFHG4 Fuse Holder

In-line AGU fuse holder accepts 4- to 8-gauge wire

Item #: 142CFHG4

T-Spec Capacitor

T-Spec Capacitor

1.5-farad capacitor with red LCD meter

Item #: 12015DDC

(11)

$79.99
Add to Cart
Metra Crimp Tool and Connectors

Metra Crimp Tool and Connectors

Package contains crimp tool and over 150 pieces

Item #: 120CRIMPKT

(15)

$19.99
Add to Cart
S&G Wire Cutter/Stripper Tool

S&G Wire Cutter/Stripper Tool

Cuts and strips 12- to 22-gauge wire

Item #: 18119100

(17)

$19.99
Add to Cart
S&G Tool Aid 87650

S&G Tool Aid 87650

Door Trim and Panel Removal Tool

Item #: 18187650

(71)

Pro.Fit Wire Worm

Pro.Fit Wire Worm

Installation tool helps route wiring through tight spaces

Item #: 042DM4533

(34)

$12.99
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Bojo Trim Panel Tools

Bojo Trim Panel Tools

Set of 6 pry tools — helps remove interior and exterior trim and door panels

Item #: 126CR6NGL

(54)

$24.99
Add to Cart
Skewdriver Pro SPK4042

Skewdriver Pro SPK4042

Ratcheting straight and offset screwdriver set with 40 bits (Skewdriver Pro with ratchet handle, pictured)

Item #: 180SPK4042

(8)

$49.99
Add to Cart
Bojo Trim Panel Tools

Bojo Trim Panel Tools

Set of 6 pry tools — helps remove interior and exterior trim and door panels

Item #: 126CR6LNGL

(2)

$29.99
Add to Cart