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Rockford Fosgate Punch P500-1bd

Mono subwoofer amplifier — 500 watts x 1 at 1 ohm (New Stock)

8 Reviews | 1 question - 1 answer

Item # 575P5001BD

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Our take on the Rockford Fosgate Punch P500-1bd

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.

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

P500-1bd Punch performance

The P500-1bd mono subwoofer amp dispenses 200 RMS watts at 4 ohms, and it'll deliver up to 500 watts to a 1-ohm load without breaking a sweat. You can tailor the sound with variable-frequency low-pass and subsonic filters, and use the onboard EQ to add some low-frequency punch 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 move.

P500-1bd connections

Confused about impedance? Check out our article on matching subs and amps.

Product Highlights:

  • mono subwoofer amplifier
  • 200 watts RMS x 1 at 4 ohms (400 watts RMS x 1 at 2 ohms)
  • 500 watts RMS x 1 at 1 ohm
  • CEA-2006 compliant
  • Dynamic Thermal Management cooling system
  • variable low-pass filter filter (35-250 Hz, 12 dB/octave)
  • selectable subsonic filter (28Hz, 12 dB/octave)
  • variable bass boost (0-18 dB at 45 Hz)
  • optional wired remote bass boost
  • Class-BD amplifier design
  • MOSFET power and output stages (uses TO-247 MOSFETs)
  • preamp-level inputs
  • preamp outputs
  • 4-gauge power and ground leads and an 80-amp fuse recommended — wiring and hardware not included with amplifier
  • no onboard fuses — when installing multiple amps in a system, an additional 80-amp in-line fuse between the distribution block and the amplifier is recommended
  • 7-5/8"W x 2-1/4"H x 10-1/4"D
  • warranty: 1 year
  • Our 60-day money-back guarantee

What's in the Box:

  • Mono-channel amplifier
  • Four 1-1/2" Self-tapping screws
  • Installation & Operation manual (English/ French/ Spanish/ German/ Italian)
  • Punch Amplifier Performance Verification Certificate

powering 2 jl audio 4 ohm w1v2's @ 2 ohms. very happy with the purchase. the subs hit hard in my 90 gmc ext cab. the folks at Crutchfield are the best.

royp, beeville tx


Rockford Fosgate Punch P500-1bd Reviews

Average Customer Review(s):

(8 Reviews)

all the punch you"ll need!

royp from beeville tx on 9/7/2014

Crutchfield Customer Review (What's this?)

powering 2 jl audio 4 ohm w1v2's @ 2 ohms. very happy with the purchase. the subs hit hard in my 90 gmc ext cab. the folks at Crutchfield are the best.

Pros: small amp big power

Cons: none

great amp.

palaw77 from moscow, id on 8/20/2014

Crutchfield Customer Review (What's this?)

This sub it amazing and pushes my alpine type r easily. For a 500 watt amp on the birth sheet it was making 750 watts at 1 ohm.

Pros: Easy to use Easy to install Makes 700 watts RMS Looks great.

Cons: None that I have found out

rock solid

greg from cass city mi on 7/20/2013

Crutchfield Customer Review (What's this?)

solid amp with all features necessary for a subwoofer,love the compact size &under rated power output 450@2ohm &695@1ohm

Pros: size&power

Cons: none

Get more than what you pay for with Rockford Fosgate

JasonD from North Beach, MD on 1/29/2013

Crutchfield Customer Review (What's this?)

Rockford Fosgate has been ahead of the pack for some time now in my opinion. I bought this Amp knowing it would exceed its advertised specs as they always do.My test certificate shows 698 rms watts @ 1 ohm stable! absolutely awesome power and never misses a beat with my 12" Alpine type R. Couldn't be happier with my purchase and as always I received it in 1 business day. Can't go wrong with Rockford Fosgate and the Crutchfield team!

Pros: More than what you pay for. Its a very small amplifier for the power it produces. Also looks very clean installed.

Cons: None in my opinion

Rock Solid

ED2KSR from Puerto Rico on 1/2/2013

Crutchfield Customer Review (What's this?)

Quality amp. Throws out plenty power for my Infinity 12" Subwoofer. Throws out 200 x 1 @ 4ohms / 400 x 1 @ 2ohms / 500 x 1 @ 1ohm. I have mine kickin at a certified 428 x 1 @ 2ohms and STABLE!

Pros: Plenty of power. Compact. Quality construction.

Cons: None so far.

Rockford Fosgate Punch P500-1bd

TJ from Wimauma, Florida on 11/10/2012

Crutchfield Customer Review (What's this?)

First off! the amp was rated at 500 watts x 1 x 1ohm but when I got it in the mail and read my Performance Verification Certificate it said it was actually rated 707 TOTAL RMS POWER. Now you do the math, I was paying for 500 watts and received an additional 207 watts. I hooked this bad boy up to my Rockford Fosgate punch P3d2-10 with my Sound Ordinance bb10-125v ported box and my kenwood Kenwood Excelon KDC-X896 radio. All I have to say is I need to make a doctors appointment for my new hearing loss. The bass hits Hard, Clear and it is very intense. I love these upgrades, and to let everyone know, I am a real person and this is my first review for anything I have every purchased. I choose to do this because I am so satisfied with crutchfield as a company and their tech support I wanted others to feel what I feel. I am definatly a customer for life... Thank You everyone at crutchfield you are all very appriciated..

Pros: My amp was rated 207 more watts than I expected and the shipment was received at my home in two days. Excellent...Excellent...Excellent... is all I have to say.

Cons: NONE. Even at their price it is the cheapest around and I got more than I expected. I was very pleased with everything in this amp..

Great amp!

Zachary from Baton Rouge, Louisiana on 6/24/2010

Works great, tons of power and stays cool after hours of playing even in the Louisiana heat. Kinda pricey but well worth the money. Fosgate is top of the line and will NOT leave you dissapointed! Hookup is simple as pie and took no time.




SAM from Texas on 3/31/2009

Crutchfield Customer Review (What's this?)

I bought this amp. through Crutchfield and what a great help these guys are for starters. When I first got into car audio back in the late 1980's I ran a Punch 150 on two Series 1 12'' and thought it was loud. I am hear to tell you this amp is pushing two P210D2'S and it sounds incrediable. If I like I can set my buddies car alarm off with the volume set at 10! Rockford Fosgate, thanks for a great product. To you folks at Cruthfield, you guys are the best and thanks for the help, and answers.




Hands-on research

Product Research



Overview: With its super efficient Class-BD circuit topology, the Rockford Fosgate P500-1BD assures maximum power output. Due to its dedicated low frequency response, this amplifier is optimized for mid-bass speakers or subwoofers only. The amplifier is 1-ohm stable (500 watts x 1) and will drive a pair of 4-ohm DVC subwoofers or quad-configuration of 2-ohm DVC subwoofers with ease.

Class bd Design: Rockford Fosgate bd topology is a revolutionary patented design, integrating a technology that is more efficient than typical class AB and has lower distortion than class D designs. Punch bd amplifiers are 75-80% efficient vs. 20-60% efficient class ab amplifiers. This means, more power from your amplifier with less drain on your vehicles electrical and 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.

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

DSM (Discrete Surface Mount): DSM utilize 1% tight-tolerances improving efficiency of the circuit, decreases cross-talk from other discrete components and lowers operating temperature. An industry-leading manufacturing process, DSM utilizes high-speed robotics, high-quality 1% tight-tolerance parts and large board traces. The discrete components are laser etched to meet a particular value and a very low tolerance. This lower tolerance improves the efficiency of the circuit, decreases cross-talk from other discrete components and lowers operating temperature.

TO-247 MOSFETs: The Rockford Fosgate amplifier use custom TO-247 MOSFETs. These have 60% more metal tab area for more power capacity, lower impedance and improved heat dissipation over traditional TO-220 MOSFETs found in many other amplifier. The MOSFET transistor is the best type of device to use when building a high quality mobile amplifier. The TO-247 has 60% more metal tab area and its unique, fully encapsulated design is capable of housing a silicon die (the heart of the MOSFET) twice as large as the TO-220. The larger die provides more power handling capacity. Additionally, the extra metal tab area ensures that no matter what size silicon die is inside, the thermal impedance will always be lower than in the TO-220 due to improved heat dissipation.

MEHSA3: MEHSA3 reduces MOSFET temperatures, lowers distortion, increases durability and prolongs the output device life span. MEHSA3 (Maximum Efficiency Heat Sink Application - gen. 3) is a proprietary process that yields up to five times better heat transfer than traditional FET mounting techniques, using the exact same components. A multi-layer insulated metal substrate operating with minimal thermal resistance spreads heat both downward and outward to quickly dissipate heat from each device across the heatsink. This process combined with Rockford's optimized heatsink designs, DSM (Discrete Surface Mount) technology and MOSFET devices, allows the amplifier to squeeze more watts per cubic inch from every output device as well as provide consistent thermal stability. The 3rd generation creates a dielectric layer between the ceramic topside and the aluminum base that retains all of the electrical isolation and capacitive coupling of the original MEHSA material increasing it's thermal conductivity. The higher power handling results in a 20% reduction in thermal impedance.

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.

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.


Internal Crossover: The amplifier features a built-in 12dB/octave Butterworth low-pass filter with a variable crossover point from 35Hz to 250Hz.

Punch EQ2: The Punch EQ on-board equalization circuit helps correct for acoustical deficiencies in the listening environment. This control is a narrow band adjustment variable from 0dB to +18dB at 45Hz with a Gyrator based Punch EQ that eliminates frequency shift with boost.

Infrasonic Filter: This 28Hz high-pass filter is designed to prevent frequencies below the audio range from being applied to the subwoofer from the amplifier. This infrasonic filter improves your subwoofer performance and power handling, particularly in vented enclosures.


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 100-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 100-amps, the original should be replaced with a 100-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.

Dual Speaker Terminals: The Punch mono-amplifier features two pair of speaker output terminals so you can easily connect two 4-ohm speakers to the amplifier in a 2-ohm load configuration. The two pair of 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.

Differential Input RCA Inputs: The amplifier features a pair of differential RCA input jacks for easy connection of signal level 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. The RCA input jacks are nickel-plated to resist signal degradation caused by corrosion.

RCA Outputs: The amplifier also features a pair of RCA "Pass-Thru" jacks which 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 rear amplifier location. The RCA output jacks are nickel-plated to resist signal degradation caused by corrosion.

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 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.

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 verify what’s in the box, 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.

Q & A

Customer Q&A

1 question already asked

If you purchased the product from Crutchfield, feel free to contact our Tech Support team. They can walk you through the settings on the product and see if there may be a fix. Our toll-free Tech Support number is printed on your invoice, and is also available under the "My Orders" tab in the "My Account" section of our website. If you did not purchase the unit from Crutchfield, then you may want to contact the manufacturer. You can also post your question in our forums: Or try our online support center: [ Krissy  Apr 08, 2014 ]  Staff