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Rockford Fosgate PBR300X4

300W 4-Channel Class BR Punch Boosted Rail Amplifier

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List price $289.95

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$169.95

with warranty

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Get Our Expert's True Opinions!

While the Rockford Fosgate PBR300X4 is a great compact amplifier, there are other small footprint amps of comparable, and even superior specs for a better value. The Cerwin-Vega B4 amplifier provides higher power ratings (600W RMS total) with class D circuitry for the same price. The NVX MVPA4 provides more efficient performance (it runs cooler) with slightly better power ratings in a smaller amplifier all while costing $30 less!

Best Bang for Your Buck!
Rockford Fosgate
PBR300X4
Cerwin-Vega
B4
NVX
MVPA4
Your Price $179.95 $179.99 $149.99
RMS Power 4 ohms: 75W x 4 chan.
2 ohms: N/A
4 ohms: 80W x 4 chan.
2 ohms: 150w x 4 chan.
4 ohms: 50W x 4 chan.
2 ohms: 100W x 4 chan.
Bridged Power Not Bridgeable Not Bridgeable 175W x 2 chan.
Amplifier Class BR D D
Low Pass Filter 80 Hz 50-250 Hz 40-400 Hz
High Pass Filter 80 Hz 25-250 Hz 40-400 Hz
Dimensions 4.25"W x 6.75"L x 1.5"H 4.02"W x 8.7"L x 1.4"H 4"W x 5.44"L x 1.56"H



General Features

  • Punch Series BR Full Range 4-Channel Car Amplifier
  • RMS Power Rating:
    • 4 ohms: 75 watts x 4 chan.
  • Total power output: 300 watts RMS
  • MOSFET power supply
  • Ultra compact chassis
  • LED power (green) and protect (red) indicators
  • Soft Start Turn-on
  • 4/2 channel operation
  • Variable DC offset sensitivity
  • MEHSA3 technology for MOSFET temperature reduction
  • 2-Way Protection Circuity System
  • NOMAD "real time" circuitry protection technology
  • Extruded aluminum heat sink for convection cooling and extreme heat dissipation
  • Nickel-plated RCA level inputs
  • Nickel-plated screw terminals
  • Selectable high-pass filter (80 Hz, 12 dB/octave)
  • Selectable low-pass filter (80 Hz, 12 dB/octave)
  • CEA-2006 compliant amplifier
  • Frequency response: 20-20,000 Hz
  • Dimensions: 6-3/4"L x 4-1/4"W x 1-1/2"H
  • 10-gauge power and ground wiring is required for installation. Contact us for information regarding a discount on select amplifier kits when purchased together with this amplifier.
  • 1-year SonicElectronix.com warranty

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.

75 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.

Not Specified by Manufacturer
RMS Power @ 1 ohm

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 1 ohm, 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.

Not Stable
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.

Not Bridgebale
Peak Power Output
This form of power rating refers to the maximum amount of power an electronic device can handle or output in an instant without damage occurring. Often times this maximum is achieved during a brief musical burst, such as a drum accent, or low bass hit.

Some manufacturers display peak power ratings on the face of their products to increase the appeal to consumers. The RMS power rating is more accurate, and we recommend using it for product comparison.

1000 watts x 1 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 BR (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.

BR
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.

1000 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.

300 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.
10 AWG
Minimum Impedance Unbridged
The lowest impedance the amplifier will handle when it is not bridged.
4 ohms
Minimum Impedance Bridged
The lowest impedance the amplifier will handle when it is bridged.
Not Bridgeable
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.
0.50%
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.
Yes
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.

80 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.

80 Hz
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
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.

Warranty and Return Policy

Parts Warranty Duration
1 year
Labor Warranty Duration
1 year
Warranty Provider
Sonic Electronix

Summary of Customer Ratings & Reviews

Rating Distribution

5 Star
47%
4 Star
38%
3 Star
6%
2 Star
3%
1 Star
6%

Average Attribution Rating

Durability
4.2
Value
4.5
Features
4.4
Design
4.8
Usability
4.7
Steve

Sycamore, IL

Overall
Durability
Value
Features
Design
Usability
Great little amp

November 19, 2014

This little amp in combination with a good set of speakers is well worth the money. I mounted it in my fairing of my motorcycle. It easily powers two six inch rounds up front, and two 6x9's in the bags. It sounds great without any distortion. Installation was simple and quick. I would definitely recommend this amp.

0 of 0 found this helpful

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CML Decor and Design

Woodbridge, VA

Overall
Durability
Value
Features
Design
Usability
Amp

June 10, 2014

Easy to connect and powerfull sound for its small size. I have only had it for a month so I can't attest about its durability.

0 of 0 found this helpful

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BAK32

DuQuoin, IL

Overall
Durability
Value
Features
Design
Usability
The PERFECT amp for your bike !!

April 28, 2014

I recently installed the RF PBR 300X4 amp, along with pair of RF M262 speakers, in the Dead Center fairing of my'02 Harley Road King. So far, the combination is exactly what I was looking for - loud and clear. Other reviews commented on the amp getting hot enough to shut down, but so far it has not been an issue. Hopefully it won't be an issue when it heats up later this summer. I made my own bracket out of aluminum flat stock to mount the amp. The PBR 300X4 was easy to hook up and the volume/tone combinations are endless. I visited several different websites and Sonic Electronix was a no brainer to buy from. Lowest prices and great technical help. A definite piece of advise is to direct wire to your source instead of using the RCA cables. The sound and volume are MUCH better. I have graded Overall and Durability at 4 only because I have only been using them for a couple weeks. Ride safe !!!!

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Chris

Jacksonville, FL

Overall
Durability
Value
Features
Design
Usability
This little thing kicks!

April 22, 2014

I installed this into my motorcyle fairing pushing 4 - 51/4. What a difference. Now I can hear it over my loud pipes!

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gary

Seattle, WA

Overall
Durability
Value
Features
Design
Usability
Big power in a little sizes

April 17, 2014

I would by this amp again it's very powerful and can run some woofers like a big amp

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da truth

chicag'il

Overall
Durability
Value
Features
Design
Usability
300.4

April 16, 2014

I recently purchased and had installed in my2010 chevy malibu. Pleasantly surprised by the output and clarity of this little baby. Small amp with huge sound quality level goin to my 6.25 kenwood door speakers and 6x9 kenwood rear speakers. Now I defintely have to upgrade to bigger amp and subs to get deeper bass

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Robert

Houma, LA

Overall
Durability
Value
Features
Design
Usability
Good strong power

March 26, 2014

Good amp for bikes just can't turn it up all the way hurts my ears.
High distortion but that it due to the Harley deck that has .5thd where I'm used to like .001 THD. I am sure if Harley made a radio with low inputs it would be cleaner sound. All that said I would buy this amp again for any bike hi or low inputs as I always been fond of Fosgate

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Jay

Milwaukee, Wisconsin

Overall
Durability
Value
Features
Design
Usability
good buy

February 28, 2014

Fast shipping, nice product, also was a good price, would buy again.

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hognutts

Madera, ca

Overall
Durability
Value
Features
Design
Usability
Does the job

February 21, 2014

I highly recommend this amp. i was using a 1000 watt lanzar mini Max and this is way better.

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Shane-O

Newark, CA

Overall
Durability
Value
Features
Design
Usability
This lil rocker realy pumps!!

January 27, 2014

I AM SIMPLY AMAZED!! This lil dynamo can really pump up the volume!! So I installed this in a 2012 Pathfinder and it fits neatly under the passenger seat with lots of air space around it. I hooked it up after the stock radio out to Rockford 6x9 T1-Power in the front doors and 6.5 in the rear doors. It really drives these speakers well. I am sold on these lil buggers. I read that adequate air flow is crucial. So keep that in mind. I'll probably put a set in my 2012 Sonata soon. (Bi-amped and pumped too by Rockford.) Oh and the ability to go straight in on hi-level speaker inputs really sold me too.

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fred

owensboro

Overall
Durability
Value
Features
Design
Usability
great

January 26, 2014

best for the money you wont ever get a better one for the cash

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phil

Salinas, CA

Overall
Durability
Value
Features
Design
Usability
Satisfied

November 14, 2013

As of now I am very satisfied with this amplifier. I placed it in the fairing of my motorcycle(Victory Cross Country) and gained a large amount of crystal clear sound. Definitely worth the money, IMO. Before I used the amp, it was hard to hear or understand the music at 60mph, not though.... I can hear perfect at 90+ with little distortion(wind will always be there). Love the 2 and 4 channel option, but even though its in my fairing wish it was a marine amp just in case.

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Jim

Norristown, PA

Overall
Durability
Value
Features
Design
Usability
Mixed feelings

September 17, 2013

This is hands down a superb amp for the cost. I run four 6.5 kicker speakers on it. Never distorts, gets real loud. The only thing I hate is the inputs. They are inconvenient and it's easy to pull out. Keep this in mind when you purchase this amp. Also it tends to hog all the power from my sub when I turn it up. Might need a cap to fix this. Very satisfied with the output and functionality.

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Berkeley Auto Sound and Security, LLC

Martinsburg, WV

Overall
Durability
Value
Features
Design
Usability
Great Amp!

September 11, 2013

I just finished installing one of these amps in an '89 Porshe Carrera...wow! I still am in disbelief how this tiny amp pushed 2 sets of JBL components.. This car screamed and my customer was extremely happy with his purchase. I have been installing for over 14 years professionally and still can't believe this little amp did what it did..10 gauge wire is recommended but I managed to install it with 8 gauge... I could see the amp running hot if the wire run is long using 10 gauge. For future purchasers, buy 8 gauge wire if your run is longer than 10 ft.

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Cdietzjr

Lillington, NC

Overall
Durability
Value
Features
Design
Usability
Use in motorcycle Cairo g

September 10, 2013

I purchased this unit for use in an after market fairing for an HD Roadking to power 4 speakers and I am nothing but impressed with its push power. I will be installing 2 more speakers for the rear and have no doubt there will be no power issue

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Rocket 38

Mooresville nc

Overall
Durability
Value
Features
Design
Usability
Great Amp. Great for Motorcycles

September 10, 2013

Small. Compact. Easy installation. Great power. Not a lot of adjustments on amp.

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Rocket38

Mooresville. Nc

Overall
Durability
Value
Features
Design
Usability
Works great. Very compact

September 3, 2013

Small in size. Great power. Easy installation. Great for Harley Davidson, it Fits under stock fairing with no problem.

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Mking38

New Philadelphia, OH

Overall
Durability
Value
Features
Design
Usability
Never worked

August 15, 2013

I had originally purchased this amp to have a matching system for my car. I had the amp installed into my car and about two weeks later it went into protect mode and would not come out of it. So I had sent it back and got it replaced with my warranty. After receiving my new one in the mail I had immediately installed it into my car and I got no sound what so ever. It never worked right out of the box and it felt like it was on fire. I would not recommend this amp for anything. If you need a small amp for your bike or car system I would recommend you look somewhere else rather than this product.

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Robert

Canada

Overall
Durability
Value
Features
Design
Usability
great sound from this little puppy

July 22, 2013

Have it installed in my venza great power and crisp clear sound. Using infinity speakers teamed up with the fosgate amp

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Randy

Cozad, NE

Overall
Durability
Value
Features
Design
Usability
Great Little Amp

June 18, 2013

Powerful little amp installed on a Harley Davidson Street Glide.

0 of 0 found this helpful

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Accessory Tools and Products

Accessories added

NVX XBG3PK 1/0 Gauge OFC Big 3 Upgrade Kit

Comes with everything you need to upgrade your power and ground wire.

Your Price $59.99

Kicker Big 3 Package 1/0 Gauge Big 3 Upgrade Kit

Get all you need including wire cutters to upgrade your power and ground wire.

Your Price $151.99

Belva BBG3KT CCA 1/0 Gauge Big Three Kit

Features everything needed to upgrade factory power and ground wire.

Your Price $39.99

Small Universal Remote Level Bass Control

The Scosche RLC is a smaller universal bass remote that connects via RCA inputs.

Your Price $11.99

StreetWires FB8

8 Gauge Firewall Bushing

Your Price $6.95

NVX XDBU4 - Top of the Line!

Distribution Block with Two 1/0 or 4 AWG Inputs and Four 4 or 8 AWG Outputs

Your Price $17.99

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

Kicker K-Series RCA Interconnect Cable

19 ft. of 4-Channel RCA cable with dual twisted-pair conductors, hyper-flex technology, and gold plated contacts for maximum signal transfer!

Your Price $29.95

StreetWires ZN7 RCA Interconnect Cable

16.4 ft. of 4-Channel RCA Cable with hyper twist construction, oxygen free copper, and precision machined tips.

Your Price $59.99

Kicker 4-Channel RCA Audio Interconnect Cable

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

Your Price $19.95

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 $29.99

NVX XWS1625 16 AWG Speaker Wire

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

Your Price $13.99

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

The Install Bay IB-CAP1F

True 1.0 Farad Car Audio Capacitor for up to 1000W Max

Your Price $37.99

e2 ECAP1 by Scosche - Mid-Level 1 Farad

Digital 1.0 Farad Car Audio Capacitor for up to 1000W Max

Your Price $49.99

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

SMD DD-1 Distortion Detector

Set the gain of an audio amplifier quickly and accurately

Your Price $149.99

Scosche SPL Meter SPL1000F

Handheld boomSTICK measures your SPL range from 60 to 135 dB

Your Price $21.99

Browse 2 questions and 5 answers
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Why did you choose this?
Sonic Electronix Store
Compact size, for motorcycle
Steve C on Oct 18, 2014
I'm putting this on my polaris ranger, needs to be small in size
Michael O on Sep 14, 2014
The specs on this amp say that 10 gauge is the maximum input size, but I have been reading that for 300W, 8 gauge should be used as a minimum. Even your 10 gauge wiring kits are only recommended up to 200W for the kicker brand (only 100W for the other one). Suggestions?
Rob C on Nov 27, 2014
Best Answer: This thing is going to run ridiculously hot no matter what you do. But to answer your question, the terminal block will only fit a 10 gauge wire, so what I've done is made that cable as short as possible. In my setup I have a 4 gauge cable running from the firewall to a splitter fuse box and mounted the splitter within a foot of the amp which makes the stretch pretty short. I use the other terminal to power my sub amp with an 8 gauge. Just use high quality braided 10 gauge cabling and you'll be fine.
Reply · Report · Chase W on Nov 28, 2014
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Product Summary

Manufacturer

Model Number

PBR300X4

UPC

780687333102

Weight

2.50lbs

Internal SKU

pbr300x4

Internal Product ID

34758

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 PBR300X4