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Rockford Fosgate Prime R250X4

250W 4-Channel Class AB Prime Series Full Range Amplifier

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List price $209.99

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$119.99

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Rockford Fosgate Prime R250X4

250W 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!

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NVX XBG3PK 1/0 Gauge OFC Big 3 Upgrade Kit

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Bundled Savings with this Product

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

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Rockford Fosgate Prime R250X4

$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 R250X4

$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
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• 4-channel RCA Interconnect Cable

(Offer 1 of 2)

Combined Total Price

$135.01

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Rockford Fosgate Audio Store
The PRIME Choice

The Prime R250X4 is a 4-Channel amplifier perfect for any Car Audio Fanatic getting into mobile audio wanting a single amplifier to run a complete audio system. This amplifier features selectable Punch Bass to tune low frequencies, variable crossovers to either protect your high frequency speakers or feeding only bass to your subwoofers, and Pass-Thru jacks for daisy-chaining another amplifier.

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: 40 watts x 4 chan.
    • 2 ohms: 60 watts x 4 chan.
    • Bridged, 4 ohms: 125 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: 11-1/4"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 R250X4 thumbnail
(newest, current model)
Rockford Fosgate R250-4 thumbnail
(previous model, replaced by Rockford Fosgate Prime R250X4)

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.

40 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.

60 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.

125 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.

250 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
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.

No

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
83%
4 Star
0%
3 Star
17%
2 Star
0%
1 Star
0%

Average Attribution Rating

Durability
5.0
Value
4.8
Features
4.7
Design
5.0
Usability
5.0
JetAMT

Kennesaw, GA

Overall
Durability
Value
Features
Design
Usability
Great Amp

October 19, 2014

this is the 2nd Rockford Fosgate amp I have purchased from Sonic, and I couldn't be more pleased. It's a small amp, but delivers big sound. When connected to my Kenwood head unit, it rocks! Not only will it blast my truck, at more normal volumes, it makes the music sound so much fuller. Rcokford Fosgate tests all their amps before they ship, so even though its rated at 250 amps, mine tested at 336 amps, wow. easy hook up ans small package to hide in Reg cab truck. I would definitely recommend

19 of 36 found this helpful

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Zachary

Ocoee, FL

Verified Purchase
Overall
Durability
Value
Features
Design
Usability
Can You Cook On This Thing?

November 20, 2015

First, I'll say this puts out great power. But, it gets HOT! I had it powered fully at 4 ohms and when I went to touch it I actually backed my hand off of it. I'm scared to actually take it down to 2 ohms because of how hot it gets now. Anyway, same quality you get from any Rockford Fosgate amp, just that one little hiccup. Just make sure its in a very well ventilated area, and you'll be okay. When I have the windows down and air flowing right to it, it doesn't get as hot as when I'm just driving around with the windows up and no AC on. With that heat though, it puts out some weird noises through the speakers. It doesn't do it before it gets heated up, but once it gets hot, sound quality goes down quite a bit. With that said, its still in tact very well and hasn't smoked at all. I have smelt it getting hot, but never actually seen any differences in it. It has been holding up very well for how hot it gets, and I drive long distances constantly.

0 of 0 found this helpful

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Alex

FLORIDA

Verified Purchase
Overall
Durability
Value
Features
Design
Usability
Great little amp.

October 16, 2015

Great little amp for the price. Fits snug under my passenger seat and since the chassis is so small you dont notice it from the backseat. This amp has never shutoff nor had any issues. Tuned with a dd-1, the sound is crisp and clean at all levels. Also, the certificate says it was rated at 333w. So i paid for a 250w and got 333w. You can't beat it! Id recommend this entry series amp to anyone wanting to upgrade from stock. - Alex

0 of 0 found this helpful

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Nathan

virden, IL

Overall
Durability
Value
Features
Design
Usability
Great amp

March 23, 2015

This amp is great. It pushes my kicker 6x9s and Polk 6 1/2 perfect. Cristel clear sound worth the money. Been running this amp for a month now can't say anything bad about it. Love shopping with sonic great products and prices.

10 of 20 found this helpful

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Debbi

Willis, TX

Overall
Durability
Value
Features
Design
Usability
Great Buy

August 8, 2014

My son simply loves Rockford Fosgate products this is the only site he will buy from . Thank you so very much for carring this line of Products

21 of 42 found this helpful

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Big John

Ludowici, GA

Overall
Durability
Value
Features
Design
Usability
Great four channel amp !

January 9, 2014

I installed this amp for a friend's mom . In a Toyota suv . I upgraded the factory jbl door speakers I wanted an amp with enough power to push four 100 rms speakers . This Rockford amp didn't disappoint . Like most Rockford amps it is underrated my birth sheet said 270 watts as tested . Bottom line is plenty of power good separation from front to rear . This is a good mids and highs amp . I high recommend .

23 of 50 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 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 6 questions and 7 answers
Hide answersShow all answers | Sort by
Why did you choose this?
Sonic Electronix Store
because ROCKFORD FOSGATE
matthup on Mar 26, 2015
Rockford Fosgate products are pretty good and seem to be well built. we'll see i guess
Carson D on Oct 23, 2014
I have this amp and when I hook up my tweeters to this amp and put the high pass filter on no sound comes from them is this because I have 2 other speakers on the other 2 channels on low pass filter? if that's not the case could you please come up with other solutions I could try?
A shopper on Jan 22, 2015
· Add Answer · I Have This Question Too (5)
can I have 4 speakers wired to 2 channels at 2 ohms and the other 2 channels bridged at 4 ohms to a sub?
A shopper on Mar 1, 2015
Best Answer: Hello,

We do not suggest doing so; But the Manufacture's manual [page 11] suggests it can be done.

http://www.rockfordfosgate.com/rftech/library/2013/3_Amplifiers/1230-57810-02_PrimeAmp-MAN.pdf
Reply (1) · Report · Customer SStaff on Mar 1, 2015
· Add Answer · I Have This Question Too (0)
I have this AMP, I wanted to see what are my option if I want to install a new Sub Woofer. I have 07 Accord coupe with Navigation, will I need the RCA converter? - Thank you!
A shopper on Apr 10, 2015
Best Answer: You can hook the rcas up normaly if you have an aftermarket radio. If not then you can also use the high level inputs included with this amp just splice into your speaker wire inputs and connect those to the amp and put it on low pass and you should be good to go
Reply · Report · matthup on Apr 11, 2015
· Add Answer · I Have This Question Too (0)
if I have 2 channels hooked up at 2 ohms and the other 2 channels at 4 ohms will this amp work?
matthup on Dec 24, 2014
Best Answer: Hello Matt,

Not advisable. It will work for a few months, but it WILL stress the amp, and eventually fail. Doing this is considered Warranty Void, for improper use. Such a setup requires Separate Amps.
Reply · Report · Customer SStaff on Dec 24, 2014
· Add Answer · I Have This Question Too (0)
can I hook up 2 8 ohm speakers to 2 channels and will it be safe?
matthup on Dec 18, 2014
Best Answer: Hello Matt,

Yes, however, you will likely only get roughly 25w RMS @ 8ohms, and this obligates the remaining channels to the same impedance. You can just as easily bridge the channels to get a bit more power.
Reply · Report · Sonic Electronix SStaff on Dec 19, 2014
· Add Answer · I Have This Question Too (0)

Product Summary

Manufacturer

Model Number

R250X4

UPC

780687340551

Weight

6.50lbs

Internal SKU

r250x4

Internal Product ID

67752

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 R250X4

  • Rockford Fosgate Prime Series Amplifiers
  • How to Install a Car Amplifier