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Rockford Fosgate Prime R300X4

300W 4-Channel Class AB Prime Series Full Range Amplifier

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List price $239.99

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$119.99

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Rockford Fosgate Prime R300X4

300W 4-Channel Class AB Prime Series Full Range Amplifier

$119.99

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NVX XKIT84 4-Channel 8-Gauge Wiring Kit

In case you didn't know, NVX has top notch wire and this kit has everything you need!

$69.99

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NVX XBG3PK 1/0 Gauge OFC Big 3 Upgrade Kit

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

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12-Volt Deep Cycle AGM Power Cell with 750 Max Amps

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Bundled Savings with this Product

Save 25% on an 8 Gauge Amp Kit with Purchase!

You will need an amp kit to install your amp, and the TruConnex TC4KIT-84B by Metra is the perfect kit for this amp. For a limited time, when you click "Add Both to Cart", you'll receive 25% off the amp kit. This offer cannot be combined with any other coupons or offers.

5.01

67753

1216

Rockford Fosgate Prime R300X4

$119.99

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TruConnex TC4KIT-84B by Metra

$20.03

Special Price $15.02 ($20.03 if purchased separately)

TruConnex TC4KIT-84B by Metra

• 8 Gauge Power Amplifier Installation Kit
• Ideal for Systems Up to 450 Watts
• Premium Power and Ground Wire Provides Optimal Power Transfer
• 4-Channel Twisted RCA Cables

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Rockford Fosgate Prime R300X4

$119.99

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NVX XKIT84

$69.99

Special Price $52.49 ($69.99 if purchased separately)

NVX XKIT84

• 8 Gauge 4-Channel Complete Amplifier Installation Kit
• For Car Audio Systems Up To 600 Watts RMS
• Silver-Tinned 100% Virgin Copper
• 4-channel RCA Interconnect Cable

(Offer 1 of 2)

Combined Total Price

$135.01

You Save $5.01

Rockford Fosgate Audio Store

The PRIME Choice

Rockford Fosgate amplification at an unbelievable value. The R300X4 4-channel amplifier is so versatile, it will be the only amplifier your system needs. Full-range or component speakers on the front channels and a single R1S410 10" or R1S412 12" woofer bridged/mono on the rear. Consider your system clean, loud and done!

Class-AB

An amplifier topology with the best of both worlds; a Class A preamp and Class B output stage. Class A topologies area great for sound quality but can require alot of current. Class B designs are great for power delivery. Amplifier designs utilizing a Class A/B topology reaps the benefit of great sound quality in the front-end (preamplifier stage) while delivering great power in the output stages (MOSFET drivers).

General Features

  • Prime Series Full Range Class AB 4-Channel Car Amplifier
  • RMS Power Rating:
    • 4 ohms: 50 watts x 4 chan.
    • 2 ohms: 75 watts x 4 chan.
    • Bridged, 4 ohms: 150 watts x 2 chan.
  • CEA-2006 compliant amplifier
  • MOSFET power supply
  • LED power (green) and protect (red) indicators
  • Variable Bass Boost (0 to +12 dB bass boost at 45 Hz)
  • Soft Start Turn-on
  • 4/2 channel switch
  • 50 Amp In-line fuse is highly recommended
  • Heavy duty cast aluminum alloy heatsink for extreme heat dissipation
  • Variable high-pass filter (50-250 Hz, Butterworth 12 dB/octave)
  • Variable low-pass filter (50-250 Hz, Butterworth 12 dB/octave)
  • Dimensions: 13-1/4"L x 6-3/4"W x 2"H
  • 8-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.
  • Authorized Internet Dealer
  • 1-year Manufacturer's Warranty

Product History:

Rockford Fosgate R300X4 thumbnail
(newest, current model)
Rockford Fosgate R300-4 thumbnail
(previous model, replaced by Rockford Fosgate Prime R300X4)

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.

50 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.

75 watts x 4 channels
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.

150 watts x 2 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.
Prime (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.

AB
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 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.
8 AWG
Minimum Impedance Unbridged
The lowest impedance the amplifier will handle when it is not bridged.
2 ohms
Minimum Impedance Bridged
The lowest impedance the amplifier will handle when it is bridged.
4 ohms
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.
1.0%
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.
1 pair
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)
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.

50 - 250 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.

50 - 250 Hz
Signal-to-Noise Ratio
This spec compares the strength of the signal to the level of background noise. A higher value indicates less background noise.
100 dB
Channel Separation
Also referred to as crosstalk. The amount of interference on one stereo channel caused by the leaking of the other stereo channel. The higher the rating in decibels (dB), the better the Channel Separation.
50 dB
Bass Boost
The objective of the bass boost is to get more kick out of your subwoofer. It is a circuit that emphasizes the lower frequencies at a given point. The bass boost should always be set first before setting the gain. This feature is known for destroying subwoofers and is commonly used incorrectly, so be cautious.
Selectable 0/+6dB/+12dB
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.
Optional (Accessory required and sold separately)
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
Strappable
Some amplifiers can be "strapped" together in order to increase the output of a single audio channel. These amplifiers feature RCA preamp outputs, allowing you to pass the signal directly from one amp to the other to ensure consistency.
No
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.
Not Tested

Warranty and Return Policy

Parts Warranty Duration
1 year
Labor Warranty Duration
1 year
Warranty Provider
Manufacturer

Summary of Customer Ratings & Reviews

Rating Distribution

5 Star
75%
4 Star
25%
3 Star
0%
2 Star
0%
1 Star
0%

Average Attribution Rating

Durability
4.8
Value
4.8
Features
5.0
Design
4.5
Usability
5.0
Rob

Highland, NY

Overall
Durability
Value
Features
Design
Usability
Awesome bang for the price!!!

December 29, 2015

I've had this amp for about a month now, no problems it makes my Silverado sound great!! Easy to install plenty of power for the money. Would recommend this amp to anyone looking to upgrade their system!

0 of 0 found this helpful

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jo

rialto,california

Overall
Durability
Value
Features
Design
Usability
fab!

March 24, 2015

my son recommended the R300x4 to complete the sound system in my pt crzur. I would highly recommend it to anyone.

7 of 15 found this helpful

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James

Freer, TX

Overall
Durability
Value
Features
Design
Usability
nice amp for the price

March 16, 2015

I ordered this amp for my boss and installed it in his truck along with some of the 6.5 prime series 2ways. The sound and clarity is perefect for the price it gets loud without distortion.

10 of 22 found this helpful

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Alex

Ponchatoula, LA

Overall
Durability
Value
Features
Design
Usability
great amp for great price

January 11, 2015

This amp is powerful. Mine was rated at 402w rms. I have 2 6.5, 2 6x9, 2 5x7. Is not even half way up and they scream. Ordering 2 sets of Rockford p165 and 2 sets of p1692. Should sound better and cleaner. Rockford never disappoints me. Great product!

18 of 40 found this helpful

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Accessory Tools and Products

Accessories added

NVX XKIT84 4-Channel 8-Gauge Wiring Kit

In case you didn't know, NVX has top notch wire and this kit has everything you need!

Your Price $69.99

Rockford Fosgate RFK8 Wiring Kit

Get a matching Fosgate wiring kit for your new Fosgate amplifier! Don't forget the RCA's!

Your Price $47.99

NVX XBG3PK 1/0 Gauge OFC Big 3 Upgrade Kit

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

Your Price $79.99

Belva BBG3KT CCA 1/0 Gauge Big Three Kit

Features everything needed to upgrade factory power and ground wire.

Your Price $39.99

XS Power BIG3XS 100% OFC 1/0 Gauge Big 3 Upgrade Kit

1/0 AWG Big 3 Upgrade Kit with 100% OFC Wire for Audio Sytems up to 350 Amps

Your Price $99.99

XS Power XP750 Special Edition

12-Volt Deep Cycle AGM Power Cell with 750 Max Amps

Your Price $69.99

Kinetik HC600-BLU

BLU Series 600 Watt 12V High Current AGM Car Audio Power Cell

Your Price $51.99

XS Power D545

12-Volt Deep Cycle AGM Power Cell with 800 Max Amps

Your Price $109.99

Belva BB1D

1.0 Farad Capacitor with Digital Red Display for up to 1000W Max

Your Price $24.99

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

Kicker 4-Channel RCA Audio Interconnect Cable

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

Your Price $34.95

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

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

NVX XWS1225 12 AWG Speaker Wire

25 ft. of True 12 Gauge 100% Copper EnvyFlex Speaker Cable/Wire

Your Price $39.99

NVX XWS1625 16 AWG Speaker Wire

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

Your Price $15.99

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

StreetWires FB8

8 Gauge Water Tight 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 VUBT2

Universal Bluetooth Audio Receiver

Your Price $29.99

NVX XUBT3

Universal Bluetooth Audio Receiver & Volume/Playback Controller Knob

Your Price $74.99

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Browse 4 questions and 5 answers
Hide answersShow all answers | Sort by
Does this amp require being placed in the open for cooling or could it be placed in a compartment with little to no air flow? Thanks.
Gary D on Sep 6, 2014
Best Answer: Hello Gary,

Most amps, Especially Class AB, must have some kind of ventilation. No manufacture will ever disclose that Lack of air flow is ok. Keep in mind, their products travel the world, and no two environments are alike. In the case of the R300X4 - as already described by our awesome customer Shawn - it will get fairly up in temperature. Obviously this will also depend on CCA vs OFC Power/Ground, Outside Elements, Install Location, etc... Nevertheless, we do note suggest any 'no air flow compartment'.
Reply · Report · Customer SStaff on Sep 8, 2014
· Add Answer · I Have This Question Too (0)
my 2012 nissan versa hatch its 6.5 speaker range can this fit in my versa because it says european cars..planning to hooked up with a Rockford R300X4 and a pair of Rockford P165?
Edrick F on Jan 7, 2016
Rockford Fosgate R300X4
Rockford Fosgate R300X4
Rockford Fosgate P165-SI
Rockford Fosgate P165-SI
Rockford Fosgate P165
Rockford Fosgate P165
Best Answer: check vehicle fit guide, this is why people build custom enclosures
Reply · Report · Bryan D on Jan 17, 2016
· Add Answer · I Have This Question Too (0)
is this amp discontinued model?
A shopper on Feb 4, 2015
Best Answer: Hello,

Rockford Fosgate still lists the model as a Current Model .

http://www.rockfordfosgate.com/products/details/r300x4
Reply · Report · Customer SStaff on Feb 4, 2015
· Add Answer · I Have This Question Too (0)
does this have settings where i can have 2 channels running lower power and the other 2 higher power? i have 4x6s in the doors and 6x9s so i was hoping to max the 6x9s at 50 watts and have the 4x6s at like 30 watts can i do that with this amp?
matthup on Nov 9, 2014
· Add Answer · I Have This Question Too (0)

Product Summary

Manufacturer

Model Number

R300X4

UPC

780687340582

Weight

7.50lbs

Internal SKU

r300x4

Internal Product ID

67753

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 Prime R300X4

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