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Rockford Fosgate Punch P325.1

Mono subwoofer amplifier
175 watts RMS x 1

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  • Rockford Fosgate Punch P325.1

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Item #: 575P3251
 

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Our take on the Rockford Fosgate Punch P325.1

by Ken Nail
Rockford Fosgate

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 keeps making a good thing better with Punch amps — and you'll find one for every type of car audio system, from mild to wild.

Rockford Fosgate continues its commitment to outstanding design with the Punch P325.1 mono amplifier. Specially-designed transistors perform better than the "off-the-shelf" models most manufacturers use. Additional heatsink material keeps these critical power components running cooler, reducing distortion and increasing amp efficiency.

The P325.1 delivers the power you need to make your bass sound great — up to 325 watts RMS. The variable frequency filters adapt the amplifier to fit your installation, while the wired Punch Bass EQ kicks up the lows when it's time to get the car shaking.

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Highlights:

  • mono subwoofer amplifier
  • 175 watts RMS x 1 at 4 ohms (325 watts RMS x 1 at 2 ohms)
  • variable high- and low-pass filters (40-400 Hz, 12 dB per octave)
  • Punch Bass EQ (0-18 dB at 45 Hz) with wired remote
  • Focused Mass Heatsink design
  • removable connector cover
  • special-design TO-247 MOSFETs run cooler than standard transistors
  • CEA-2006 compliant
  • preamp inputs and outputs
  • 8-gauge power and ground leads recommended — wiring and hardware not included with amplifier
  • 11-3/4"W x 2-1/8"H x 11-1/8"D
  • warranty: 1 year
  • 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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175 x 1
Peak Power Output (Watts x Channels)
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975 x 1
Power at 2 Ohms (Watts x Channels)
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325 x 1
Bridged Power (Watts x Channels)
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N/A
Minimum Impedance Bridged
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N/A
Minimum Impedance Unbridged
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2
Best Frequency Response
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20-200k Hz
THD at Rated RMS Power
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1%
Signal to Noise Ratio
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80 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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40-400 Hz
Low-Pass Slope (dB/octave)
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12 dB
High-Pass Crossover Frequency
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40-400 Hz
High-Pass Slope (dB/octave)
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12 dB
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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40 x 1
Speaker Level Inputs
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No
Preamp Outputs
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1 pair
Width (inches)
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11-3/4
Height (inches)
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2-1/8
Depth (inches)
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11-1/8
Parts Warranty
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1 Year
Labor Warranty
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1 Year
Product Research
What's in the box?

Download owner's manual

  • Mono amplifier
  • One 7/64" Allen wrench
  • Four 3/4" Self-tapping screws
  • Remote Punch Bass controller
  • Remote mounting bracket
  • Two 3/8" Self-tapping screws
  • 16.25' Flat remote cable (with RJ-45 plugs on both ends)
  • Installation & Operation manual (English/French/Spanish/German/Italian)
  • 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
Input and Output Notes
Specifications
Warranty

Features

Removable Cover: The Rockford Fosgate Punch P325.1 amplifier features a removable terminal cover. It conceals all speaker, signal, remote, power, and ground connections, as well as the gain and crossover frequency controls for a cleaner installation.

Cast Aluminum Heatsink: The Focused Mass 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.

INDIGO (INDexed Ideal Gain Operation): The INDIGO PWM (pulse width modulation) power supply is designed to make the most of the situation it is presented with. When battery voltage is low, you are guaranteed to get the power you paid for. When voltage increases, the amp makes even more power.

MEHSA (Maximum Efficiency Heat Sink Application): 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.

TOPAZ (Tracking Operation Pre-Amplifier Zone): TOPAZ is a circuit that eliminates noise. The TOPAZ circuit prevents ground loops by allowing the output impedance of the source unit to determine the signal ground impedance the amp sees. This virtually assures that the signal ground out of the head unit and the signal input ground of the amplifier are identical, eliminating any chance for a ground loop. The result is a 30-40dB improvement of the isolation between input ground and chassis ground.

Trans-ANA (TRANSconductance Active Nodal Amplifier): The 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.

DSM (Discrete Surface Mount): In the manufacturing process high speed robotics are used to place 0% tolerance resistors and large board traces providing greater reliability and efficiency.

TO-247 MOSFET: The Punch P325.1 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.

Internal Crossover: The amplifier's internal crossover is a 12dB/octave Butterworth filter selectable for high-pass, all-pass (full range) or low-pass operation variable from 40Hz to 400Hz.

Remote Punch Bass: The Punch Bass helps correct for acoustical deficiencies in the listening environment by helping reproduce full range sound without adding excessive boost. The Punch Bass control has a narrow band adjustment centered at 45Hz, variable from 0dB to +18dB. The supplied Punch Bass wired remote can be mounted in a variety of locations. The module's case can be removed and positioned with the mounting bracket above or below the module. Without the case the module can be flush mounted in your vehicle's dash (requires a 2" x 7/8" cutout with a maximum panel thickness of 3/8"). The wired remote is 2.294" wide, 1.293" tall and 1.509" deep (2.606" including the knob and cable connection). The included cable is 16.25' long.

RCA Pass-Thru Jacks: The pass-thru jacks provide a convenient source for daisy-chaining an additional amplifier without running an extra set of RCA cables from the front of the vehicle to the amplifier location. The pass-thru jacks output a full-range signal.

Power Indicator and Protection LEDs: There are three LEDs on the top of the amplifier. A blue LED illuminates when the unit is turned on. A yellow Protect LED illuminates if a short circuit or too low an impedance is detected at the speaker connections. A red Thermal LED illuminates if the amplifier overheats. The amplifier will automatically shut down if either the yellow or red LED indicates amplifier trouble.

Input and Output Notes

Power Connections: The power and ground terminals are nickel-plated captive c-clamp wire connectors and will accommodate up to 4-gauge wire. 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.

Speaker Connections: The nickel-plated clamp wire connectors will accept wire sizes of 8- to 18-gauge. A Phillips-head or slotted screwdriver (not supplied) is required to tighten/loosen the terminals. Note: Although there are two sets of speaker terminals, the amplifier still produces a monaural signal. The A and B speaker outputs are internally wired in parallel.

Remote Punch Bass Connection: An RJ-45 jack is provided for connecting the supplied Remote Punch Bass cable.

Specifications

CEA-2006 Compliance: The specifications given by Rockford Fosgate for the Punch P325.1 amplifier comply with the new CEA-2006 Amplifier Power Standard from the CEA (Consumer Electronics Association). All manufacturers who comply with the standard can display the CEA-2006 logo on their product.

Performance Verification Certificate: Each amplifier comes with a Performance Verification Certificate which lists the results of a 10-point performance inspection as well as a measurement of the actual power output of that amp.

Warranty

Extended Warranty: A one year warranty extension, for a total of two years, is provided by Rockford Fosgate when this amp is wired using a qualifying Rockford Fosgate amplifier wiring kit. Qualifying wiring kits include CP8PO, CP8PI, CP4POS, and CP4CKDS.

 
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Rockford Fosgate Punch P325.1 Reviews

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Filter by rating:
4 out of 5

Rockford Fosgate Punch P325.1

Written By Anonymous, United States on Saturday, July 28, 2012
 
Ive been running this amp since 2006/2007. 6 Years! Holy cow it still pounds like it did day one. Hooked up to 2 RF P112S4. Talk about durable...this thing has been beaten up, banged around, and then some. It has seen soda spilled on/in it (had to take it apart and clean up the sticky), 10 degree winters, and 110 degree summers. Nothing has ever stopped this amp from playing some good bass. It has good power and technologies for when it was built., but for the most part its still up to date for a budget amp.
Pros:
SUPER DUPER DURABLE AND LONG LIFE
2 out of 2 people found this helpful
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5 out of 5

Rockford Fosgate Punch P325.1

Written By jon, vancouver island BC on Saturday, October 03, 2009
 
i've had this amp for about 3 years and it still hits hard. i have it running two 12" subs and none of my friends can believe that i only have a tiny amp powering them. i bridged it down to 1ohm and i've never had it over heat or do anything funny. by the way, the subs are 1000rms a piece. great amp. worth every penny.
4 out of 5 people found this helpful
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5 out of 5

Very nice!

Written By Kris, California on Sunday, February 25, 2007
 
I recently had this amp installed in my 06 Dodge 2500. It was outfitted with 2 Rockford P210S4"s in a sealed under the rear seat enclosure.All I can say is wow. It has exceeded my expectations. Sounds great with anything I have thrown at it Rock, hip hop, it doesnt matter. Two thumbs up.
6 out of 6 people found this helpful
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5 out of 5

Very good amp!

Written By Jay, K.C. Missouri on Monday, October 09, 2006
 
I have this amp & I'm using it to push one Rockford Fosgate 12" Punch Stage 2 in a ported box. It really gets the job done! Most people who ride in my car think I have MORE than one sub. Punch amps are also underrated, it claims to put out 175WX1 @ 4 ohms, but the spec. sheet I got with mine says that when it was tested at the factory it put out 241WX1 @ 4 ohms.
9 out of 9 people found this helpful
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5 out of 5

Woot! first Review!!!

Written By Bill, Anoka on Saturday, July 08, 2006
 
iv had this amp for about three months now and im nothing but impressed. flawless sound quality and hard-hitting bass. claimed at 325w@2ohm, its actual power is around 390RMS. i have it pushing 2 10" infinity reference Subs in massive ported boxes. the match up delivers tight crisp bass, rarely heard from ported boxes. i reccomend this amp if you have the money, its pretty pricey but its worth every penny.
13 out of 14 people found this helpful
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