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Rockford Fosgate Punch P500-4

4-channel car amplifier — 60 watts RMS x 4 (Factory Refurbished)

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  • Rockford Fosgate Punch P500-4

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  • Rockford Fosgate Punch P500-4

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Item# 675FRP5004
 

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Our take on the Rockford Fosgate Punch P500-4

by Ken Nail

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.

Rockford Fosgate Punch amps

Rockford Fosgate continues to develop progressive sound technologies. Their aim — to produce a smaller amplifier, with all the power and clarity you expect from the Punch name.

High-grade internal components mean high-power output.

Even heat dispersal for longer life

Dynamic Thermal Management

The award-winning "Dynamic Thermal Management" 3-stage cooling system uses forced air to dissipate heat evenly across the amp and out through the heatsink. The internal components in these compact amps stay cooler, resulting in higher efficiency and lower distortion. You get more installation options, without sacrificing wattage or audio quality.

MEHSA cooling process

MEHSA is a Rockford Fosgate proprietary process that increases the heat transfer from the MOSFET devices to the heatsink. This allows the heat to escape more readily from the amplifier, so that the transistors stay cooler.

Maximum Efficiency Heat Sink Application increases heat transfer away from the transistors

P500-4 Punch performance

The P500-4 4-channel amp dispenses 60 RMS watts per channel to your front and rear speakers, or you can switch to 2-channel mode to send 250 watts RMS each to a pair of subs. You can tailor the sound with variable high- and low-pass filters, and use the onboard EQ to compensate for your car's acoustics. An optional wired remote control lets you tweak the sound from the front seat for quick adjustments while you're on the road.

Highlights:

  • 4-channel car amplifier
  • 60 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
  • Dynamic Thermal Management cooling system
  • variable high- and low-pass filters (50-500 Hz, 12 dB/octave)
  • variable bass/treble boost (0-18 dB at 45 Hz, 0-12 dB at 12,000 Hz)
  • optional wired remote bass/treble boost
  • Class-AB amplifier design
  • MOSFET power and output stages
  • 4-gauge power and ground leads and an 100-amp fuse recommended — wiring and hardware not included with amplifier
  • no onboard fuses — when installing multiple amps in a system, an additional 100-amp in-line fuse between the distribution block and the amplifier is recommended
  • 12-7/8"W x 2-3/16"H x 8-7/16"D
  • warranty: 90 days
  • Our 60-day money-back guarantee
 

Hands-on research from the Crutchfield Labs (what are the Labs?)

Features and Specs
Performance
RMS Power Output (Watts x Channels)
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60 x 4
Peak Power Output (Watts x Channels)
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450 x 4
Power at 2 Ohms (Watts x Channels)
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125 x 4
Bridged Power (Watts x Channels)
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250 x 2
Minimum Impedance Bridged
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4
Minimum Impedance Unbridged
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2
Best Frequency Response
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20-20K Hz
THD at Rated RMS Power
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1%
Signal to Noise Ratio
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85 dB
Input Voltage
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14.4v
Features
Amplifier Class
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AB
Low-Pass Crossover Frequency
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50-500 Hz
Low-Pass Slope (dB/octave)
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12 dB/oct
High-Pass Crossover Frequency
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50-500 Hz
High-Pass Slope (dB/octave)
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12 dB/oct
Bass Boost
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0-18 dB
Bass Boost Frequency
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45 Hz
Fan Cooled
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No
Fuse Rating
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100
Speaker Level Inputs
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No
Preamp Outputs
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No
Width (inches)
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12-7/8
Height (inches)
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2-3/16
Depth (inches)
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8-7/16
Parts Warranty
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90 Days
Labor Warranty
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90 Days
Product Research
What's in the box?

Download owner's manual

  • Refurbished four-channel amplifier
  • Four 1-1/2" Self-tapping screws
  • Installation & Operation manual (Eng/Fren/Spa/ Ger/Ita)
  • Punch Amplifier Performance Verification Certificate

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.

Features
Controls
Connections

Features

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.

Dynamic Thermal Management (DTM): DTM Evenly distributes excess heat across entire amplifier heatsink.

MEHSA³ (Maximum Efficiency Heat Sink Application-Third Generation): MEHSA is a Rockford Fosgate proprietary process that increases the heat transfer from the MOSFET devices to the heatsink. The multi-layer insulated metal MEHSA substrate operates with minimal thermal resistance, spreading heat both downward and outward to quickly dissipate heat from each device across the heatsink. This allows greater power output, enhanced thermal stability, and maximum reliability.

Trans-ANA (TRANSconductance Active Nodal Amplifier): Trans-ANA is a circuit that allows the audio signal to pass through the amplifier at low voltage. The signal is directly level-shifted to the fixed high voltage rails via a pair of drive transistors. Signal linearity is assured by an active node formed by the drive transistors at ultrasonic frequencies. The result is crystal clear sound quality.

NOMAD (NOn-Multiplying Advanced Decision): NOMAD is an intelligent protection circuit that uses an analog computer to make real time decisions regarding temperature, voltage, current and impedance. The unit is protected without limiting sound output unless needed.

TO-247 MOSFET: The Power P500-4 utilizes ultra high performance MOSFET output devices, giving the amplifier more power handling capability as well as lower thermal impedance for more reliable operation, even under the harshest load conditions.

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: The LEDs are located on top of the amplifier. A blue Power LED illuminates when the amplifier is turned on. A red Thermal LED illuminates if the amplifier overheats. The yellow Protect LED illuminates 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

Internal Crossover: The amplifier's internal crossovers have a 12 dB/octave slope. There are independent crossovers for the front and rear channels. Each is selectable for high-pass, all-pass (full range), or low-pass operation and is variable from 50Hz to 500Hz.

Punch EQ: Punch EQ works along with the crossover switch. When the crossover is set to low-pass, the Punch EQ acts as a variable bass boost; 0-18 dB at 45 Hz. When the crossover is set to high-pass, the Punch EQ acts as variable treble boost, 0-12 dB at 12 kHz. When the crossover is set to all-pass, both the bass and treble boost circuits are active.

Connections

Power Connections: The power and ground terminals are nickel-plated captive c-clamp wire connectors and will accommodate up to 4-gauge wire. An external 80-amp fuse (not included) must be installed on the power wire. If a wiring kit is used which includes a fuse with a value other than 80-amps, the original should be replaced with an 80-amp fuse. The remote turn-on terminal will accept wire sizes of 12- to 24-gauge. A Phillips-head or slotted screwdriver (not supplied) 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 clamp wire connectors will accept 8-gauge to 18-gauge wire. A Phillips-head or slotted screwdriver (not supplied) is required to tighten/loosen the terminals.

Remote Punch EQ (PEQ) Connection: An RJ-45 jack is provided for connecting an optional remote PEQ control (575ROCKPEQ, sold separately).  If you use the remote PEQ, the Punch EQ control for the rear channels on the amp is disabled, and replaced by the remote. Note: Previous model Punch Bass and Para-Punch remotes will not work with this amp.

 
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Rockford Fosgate Punch P500-4 Reviews

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5 out of 5

Fine product met expectations.

Written By Scout Man, Texas on Friday, June 21, 2013
Crutchfield Customer Review (What's this?)
 
Installed in a 07 mega cab. This 4 channel amp was bought to liven up the sound of my 4 Prime R165-S components. The Prime components sounded clear and loud without the amp but lacked mid range in a bad way. This amp really helped these speakers come to life. I was planning on going to a higher grade speaker after installing the amp but the sound is tuned in good enough for my liking as is. You won't be diss appointed.
Pros:
Size, sleek look matched my mono amp, price cut!
Cons:
I have yet to find any
Was this review helpful?    Yes | No
 
5 out of 5

great amp

Written By george, charlotte, nc on Tuesday, May 24, 2011
Crutchfield Customer Review (What's this?)
 
great amp! 60Wx4 and 1800 watts out of the box! I run two channels for the front speakers and bridge the rear for a sub. It's a little car and only got front door speaks. The amp is very powerful and I have the "gain" control turn to 50%. I had a RF Punch 200-2 years ago and I love RF amps!
4 out of 5 people found this helpful
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