Rockford Fosgate Prime R300X4
Crutchfield Customer Review (What's this?)
Very good product. Lots of options and very powerful.
Item # 575R300X4 | MFR # R300X4
Outlet Savings: -$24.65
$145.34 Earn up to 146 Rewards points
Rockford Fosgate performance in a small package. The Prime Series R300X4 4-channel amp can drive your speakers with 50 watts RMS each, so you'll really feel your tunes rockin'. Or, you could switch the R300X4 to 2-channel mode to run a couple of subs with 150 watts RMS each — when you buy a bigger amp for your subs later on, you can still use this 4-channel to drive all your speakers. Smart move.
You can use the high- and low-pass filters and Rockford Fosgate's famous Punch boost to get maximum performance from the speakers in your vehicle. And speaker-level inputs let you hook this amp up to almost any system, even a factory stereo.
The R300X4's heavy cast-aluminum chassis efficiently draws damaging heat away from its internal components, ensuring reliable, long-term play. The amp's built-in sensors keep track of the output current and power supply temperature, ensuring that plunging speaker impedances (they change constantly during play) or even a short circuit won't hurt anything. Your driver's seat will become your favorite place for listening to music once this Prime amp goes to work.
Scratch & Dent items may be missing non-essential accessories. In some cases the manufacturer's accessories have been replaced with generic equivalents.
Very good product. Lots of options and very powerful.
Matthew, Avoca, MI
Average Customer Review(s):
Very good product. Lots of options and very powerful.
I installed this in a 1956 Thunderbird. Because of limited space I needed a small amp to power two Rockford 6 1/2" 3-way speakers in the front and two Rockford 6x9 speakers mounted behind the seat. All I need to say is: WOW! Plenty of power for the small cab of the T-bird. I hear ALL of the music, even with the top off! I also added a Rockford Punch 300-10 powered sub at the same time and the difference in the sound is incredible. Wish I had done it sooner! If you want a quality amp at a very affordable price look at this one.
Pros: Great Value, Quality built, plenty of power.
Cons: Should have bought it sooner.
Great service and assistance! Great amp! Came as a 401 amp, very powerful. Running 2, kicker 6.5's and 3, Rockford 6x9's!
Pros: All good!
Great product and awesome service from Crutchfield
I am sure I will eventually love this amp but my 1st was bad out of the box. Crutchfield thankfully is taking great care of me and a replacement is on its way. Outstanding customer service.
Pros: I love how all the connections and controls are all on one side. Also, having the gain and x-over controls are all on top.
Cons: Well my 1st was DOA....
Great product! I have two ! And Crutchfield is always helpful and delightful !
Great as always from Rockford. I wouldn't expect anything less. And Crutchfield's service also great.
the sound quality is horrible nowhere near were rockford fosgate used to be. very disappointing.
Cons: everything about the amp.
This amp really rocks, and has more power than I ever imagined it would. Coupled with the JVC head unit, 4 JVC speakers and Rockford Fosgate Punch 300-10 that I just added from Crutchfield, my Mustang is rockin' down the highway. The sound all these components generate really puts a smile on my face. I could write a book on the install, which has nothing at all to do with the equipment I selected. Main problem is working in an '07 Mustang. It's a lot like working in a phone booth. You basically have to disassemble your entire interior if you want to do it right, running wires properly and most importantly, unseen. (even had to pull the right front wheel and remove an inner fender panel to run the power cable) And of course it wasn't without calling the tech guys at CF (I believe it was 5 times) but I couldn't of done it without their help. A HUGE shout out to Wes and TJ (I hope I have the initials correct) because both were extremely helpful with a lot of issues I was creating on myself. Being an old guy still stuck in the '60's, I haven't kept up with technology like I should, and it's been a challenge trying to keep pace. Also want to thank Dolly for all her help too, along with a couple others in tech that were there when I needed them. All in all, a very pleasant experience. My first dealings with CF was back in 1988 and they were just as good back then as they are today. Rock on!
Pros: It's a Rockford Fosgate (406 RMS)
Cons: controls for adjustments could be a little better. Gets pretty warm when cranked a while.
Awesome upgrade from my factory amp! I love this amp. Very powerful and clear, will definitely purchase additional Rockford Fosgate products in the future.
I wanted to wait 2 weeks after having it plugged in to review the amp. I got to put my hands on it and get it toned in. I have it running 2 rear coaxial and 2 front components. It's running off a JVC KW-925bts. I have no complaints on it. It is handling over 100 degrees in the trunk with not a single over heat soo far. It is putting a lot of clear clean power to all of the speakers and it really can get loud. I think it's my speakers or crossover settings but getting up in the volume range where my ears start to hurt things can get a little distorted. I don't ever need to turn it up past 23 on my volume knob that goes up to 50, because it sounds clear and loud.
Pros: Loud and clear, clean power, handles California summer heat in the trunk.
Cons: The screws that came with it could have been security screws like the sub came with. It would have been a much better decision.
Excellent, clean sound, ran all 4 channels on 6and a half inch polk speakers... well worth the money.
Great power, and small enough to hide almost anywhere in my truck.
Pros: Small and powerful
Me gusta el product. I like the product.
Pros: Bueno Good
Cons: Ninguno NoneCrutchfield response on 1/31/2017 Translation provided by Crutchfield's International Sales & Support team.
There many reasons this seasoned radio head has stay a loyal Rockford Fosgate fan, superior craftsmanship, performance, overall awesomeness.
Unit is well made and sounds awesome. It got a bit warm on first use but after improving the Gnd connection, it was fine. I use it in bridged mode driving 2 Klipsch rock speakers out on my patio. The sound is awesome.
Pros: Great quality, great sound, versatile
Cons: none yet
I've alway used Rockford amps and this one rocks! Coupled with a set of Polk speakers my jeeps sound is where it needs to be for someone that has his top off 9 months out of the year.
Pros: Great bang for you buck. Quality amp from Rockford
Great amp!!! Awesome price!!
Pros: Quality, price
Cons: None so far
Rated almost 400 watts. Sound is excellent for an entry level unit. I never hear systems that run anywhere near as loud as this. Subs yes, but not everything else. Pushes my Sony 6 x 9 speakers almost like subs. I wouldn't trade my Sony speakers for Polks if they were free. In fact, I'd throw them out and get more 6 x 9 Sonys. With an amp like this driving them the only purpose for a sub is to broadcast bass and go deaf. Sound quality is amazing even at lower volumes. Plenty of headroom for my speakers runing this at 50% and under with zero gain.
Pros: Sound Quality. Pumps Bass. Max Headroom. Can Run Without Big Three.
Cons: Big. Heavy. Hard to Mount in Newer Cars with Few Flat Surfaces.
I mounted the amp under the front passenger seat which fit perfectly and easy to get to the controls! I'm still tweaking the amp but as an amateur I configured it to a good sounding for my car. I'm running the Polk 5 1/4 speakers for the front and it sounds way better than the Sony speakers I previously were running! Maybe I'll get Polk rear speakers for a better bass! I don't have that solid bass but I don't want the loudness of a sub-woofer!
Pros: Easy to hook up and adjust the gain to the speakers!
Cons: If anything, I'm not getting to solid bass from this unit! Maybe it's my rear speakers but not much cons to this unit!
Very clean 4 channel sound.
Pros: seems to be very efficient.
WITH THE HELP OF YOUR TEAM, I GOT EXACTLY WHAT I WANTED///BETTER SOUND, CLEARER MUSIC AND WITH A LITTLE UMPFFF. IM VERY HAPPY
Pros: BETTER AND STRONGER SOUND THAN MY ORIGINAL RADIO
Just installed this to replace an alpine MRPF300 tht never impressed me. Night and day difference. This RF is sooo much better, finally the system sounds like I thought it should. I blamed head units, speakers, previously, but the problem was the two alpine amps, mrp500 and MRPF300. I replaced both with similar rated and priced RF Prime units, and the difference is staggering. Simply switched out the amps, changed nothing else. I'll never use another brand of amp than RF from now on. Oh, and the birth certificate showed 416w RMS, vs 300w rating.
Pros: Great sound, great price, good looking, adjustments on top
Cons: I didn't buy it soon enough
Great amp, very flexible with different setups, using it to drive 6x8 Polk coaxials front and rear and has more than enough power. Very happy with this amp, Install was very easy nice size gives you lots of choices.
Pros: Great power,very clean,very flexible with different setups
Works great. Easy setup.
Excellent amp. Provides more than enough power for 6 1/2 inch front and rear component speakers that I have in the doors. Also allows me flexibility to change/ upgrade the speakers in the future if wanted. I Have the gain set at half power right now.
Pros: Small and powerful. Looks good and simple to hook up. Sound comes out clear at high volume.
Cons: Not many I can think of yet. To be picky , it could have bigger connections for wire inputs and outputs. They seem small for the power of the amp.
best amp to get for your car speakers clear sound amazing!
|RMS Power Output (Watts x Channels)||
50 x 4 |
|Peak Power Output (Watts x Channels)||N/A|
|Power at 2 Ohms (Watts x Channels)||75 x 4|
|Bridged Power (Watts x Channels)||150 x 2|
|Minimum Impedance Bridged||4|
|Minimum Impedance Unbridged||2|
|Best Frequency Response||20-20k Hz|
|THD at Rated RMS Power||1%|
|Signal to Noise Ratio||80 dB|
|Low-Pass Crossover Frequency||50-250 Hz|
|Low-Pass Slope (dB/octave)||12 dB/octave|
|High-Pass Crossover Frequency||50-250 Hz|
|High-Pass Slope (dB/octave)||12 dB/octave|
|Bass Boost||0, 6, 12 dB|
|Bass Boost Frequency||45 Hz|
|Speaker Level Inputs||Harness|
|Parts Warranty||1 Year|
|Labor Warranty||1 Year|
Overview: The front and rear sections of the Rockford Fosgate Prime R300X4 4-channel amplifier are bridgeable, so it can be wired in 4-channel, 3-channel, or 2-channel mode.
CEA 2006 Compliant: The R300X4's power ratings and signal to noise ratio are measured according to the uniform standards advocated by the Consumer Electronics Association (CEA). This allows you to accurately compare these specifications for all CEA 2006-compliant amplifiers, even from different brands. Manufacturers who adhere to these standards can display the CEA 2006 logo on their products and packaging. CEA2006 Specifications for this amplifier are:
LED Indicator: The amplifier is equipped with an LED power/protect indicator. The LED illuminates blue when the unit is turned on. It illuminates red if the thermal or short circuit protection circuit is engaged, and the amplifier will automatically turn off.
Mounting: The amplifier can be mounted vertically or horizontally using the supplied mounting screws. The amplifier should never be mounted in an engine compartment as this will void the warranty.
Gain Controls: The front and rear amplifier channels have independent gain controls. Each rotary control is labeled 1 to 11 and has a sensitivity range of 150mV to 4V when using the RCA inputs, 450mV to 12V when using the speaker level inputs.
Crossover: There are also independent 12 dB/octave crossovers for the front and rear channels. Crossover switches allow you to choose low-pass, high-pass, or full-range operation. The crossover points are continuously variable from 50 to 250 Hz.
Punch EQ: The Punch EQ bass boost circuits are individually selectable, 0 (flat), +6 dB, or +12 dB and centered at 45 Hz.
Power Terminals: The power and ground terminals are nickel-plated set screw terminals and will accommodate up to 4 gauge power and ground wires.
Fuse: An external 50-amp fuse (not included) must be installed on the power wire at the battery. If a wiring kit is used which includes a fuse with a value other than 50-amps, the original should be replaced with a 50-amp fuse.
Remote Terminal: The remote turn-on terminal is a nickel-plated set screw terminal that will accommodate up to an 8 AWG wire. It's used to remotely turn the amplifier on and off.
Speaker Terminals: The four pair of speaker outputs are nickel-plated set screw terminals what will accommodate up to 8 AWG speaker wire.
RCA Input Jacks: Front and rear RCA input jacks provide an easy connection for preamp level inputs. They are nickel-plated to resist signal degradation caused by corrosion.
Speaker Level Input: Two speaker level input harnesses are included, making it easier to add the amplifier to a factory radio or to a receiver with no preamp outputs.
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.
Good price [ shawn Apr 02, 2018 ]
REplacing older unit that shorted out. Daisy suggested this was as good as other in the price range and it will fit in the same place. [ Leyton Nov 25, 2017 ]
To power front and rear component speakers [ Michael Nov 08, 2017 ]
It's awesome [ Julietta Oct 06, 2017 ]
Recommended by Crutchfield in order to provide the quality I was looking to achieve in my sound system.. [ STEVE Aug 27, 2017 ]
Rockford Fosgate has never disappointed me in the past, I see no reason to not continue trusting their legacy of quality and power, even if it is the entry level line. [ Rhett Aug 14, 2017 ]
Great amp i already have 3 [ oneil Jun 23, 2017 ]
All the power my speakers need [ Donna May 31, 2017 ]
It was recommended by an advisor to power my speakers [ Samuel May 17, 2017 ]
Have used previously and it is a good product. [ MIRIAM Jan 15, 2017 ]
I needed a good 4 channel amp for my car, since I was running a 2 channel amp. And might I add...it took my music to another level...especially when I took the factory speakers out and added aftermarket. [ Cleotis Sep 30, 2016 ]
Purchased this due to its reputation in the industry will not use anything else. [ Rodney Jun 20, 2016 ]
Brand reputation and customer and Crutchfield ratings. [ harold Jun 01, 2016 ]
The sales associate help choose this item, which after the explanation was given, it made since to choose this item. [ Lanell May 06, 2016 ]
Brand [ Walter Apr 23, 2016 ]
Rockford Fosgate is best brand for amps [ Alex Mar 27, 2016 ]
are you kidding its RF [ barry Mar 19, 2016 ]
I'm going to go ahead and recommend that you try an amp with a lower rms output. This amp pushes way more than what you actually need and you could probably go a lot cheaper as well and get great sound. If you are running 4 of these I would get a four channel amp around the 100-150 rms range. If you are running only 2 I would stick to an amp with an output no more than 100 and I would really try to find one at 60 if you can. I hope this helps at least a little! [ Cody Dec 09, 2016 ]
Should be no problem using factory wires [ DENNIS Mar 17, 2016 ]
THis is personal preference, you can use factory wiring, you'll just need to map out the color codes on wires to get your front and back left to right correct. Typically factory wiring is small gauge wiring, a lot of people prefer large diameter wires, believe to increase sound quality. I prefer larger than factory wires. But it's a lot of work and extra money. Most cases factory should be fine tho. I first noticed difference in sound quality in home stereo, using monster cable instead of small gauge. My ears seem to like bigger cables. Hope this helps [ Richard Mar 16, 2016 ]
How much watts you need depends on the speakers you plan on using. This amp is 75x4 rms. I'm no expert but usually the peak output is about double the rms. I have the gain set at about 1/2 for front and rear components that rate 50watts rms. it's way more than enough, but allows for future upgrades [ Nathan Dec 28, 2015 ]
I don't think so. [ JESSE Sep 24, 2014 ]
We have not received any answers from other customers on your question. I would recommend reaching out to an Advisor by phone (1-800-324-9695) or online chat. They should be able to help answer your question. [ Krissy Sep 16, 2014 ] Staff
I forwarded your question to an Advisor and they responded with the following: The amplifier has speaker level inputs, so you do not "need" an LOC. It can still help if you want to get the cleanest signal to your amplifier from the factory radio. If you would like to discuss further you can contact an Advisor directly by phone (1-800-324-9695) or online chat. [ Krissy Aug 06, 2014 ] Staff
4-channel car amplifier 50 watts RMS x 4
4-channel car amplifier 50 watts RMS x 4
4-channel car amplifier 75 watts RMS x 4
4-channel car amplifier 85 watts RMS x 4