Rockford Fosgate R400-4D Prime 400 Watt Full Range Class-D 4-Channel Amplifier

I installed a modest sound system in my '04 Silverado Ext. cab. I wanted a system that would provide quality sound and at a satisfying volume. I wanted crisp highs and deep lows with a punch. I did my 'homework', learning about sound quality, and what to look for in quality sound products, read reviews (thank you for your reviews!), and shopped with Amazon. I replaced the factory cd/stereo with a quality double din receiver. I gladly bypassed the factory wiring harness (saving myself $80.00 and a lot of problems). I did use the speaker wires and radio ground wire from the harness and ran new power and remote wires. 8ft rca cables from the receiver to the amp. The amps front channel powers a set of infinity kappa 6.5" door speakers rated at 220watts peak. The rear channel is bridged and powers a quality 10" flat subwoofer rated at 800watts peak. The sound is amazing! If you take the time to learn what the amp settings are and how they are to be used. I have learned that 'more' isn't always better. Low gain, for instance, is preferable to high. My front gain is set to about half-max. Freq. set to just passed half. If I had to guess, I'd say around a hundred hertz. The infinity's get pretty low w/o distortion. I have the amp in 4 channel mode because of the sub, otherwise. The rear channel, bridged into 4 ohms puts out about 200 watts according to specs. The gain is only turned up a third, if that much, which is amazing because it's kicking my ass. I had it higher at first but it was overpowering. The frequency is set just below a hundred hertz or just about where the front channel leaves off. It's a beautiful blend. The punch-eq is set to close to half and provides plenty punch for me. It's all working great together. I feel that I have more than enough volume. I have no distortion at tolerable volumes. The amp gets warm but not hot. I used 10 gauge power and ground wires. The ground is clean and solid. Mounted the amp on 'the hump' under the backseat next to sub. Plenty of clearance in this location. Well, I couldn't be happier with my purchase. I hope my review will be of help to you. One more thing that I should mention. Each amp is rated I guess before shipment and my 400 watt amp actually rated at 525 watts. I believe I benefit from the extra wattage. *** A couple of weeks later... I love the sound of my system! This amp was a Great buy for me!

Ok..so roughly 20 years ago I used to work in a high end car stereo shop and we used Rockford amps pretty much all the time. Back in that day...Rockford amps "were the $hit" so to say. Plenty of power and well made but expensive. (at least to a 19 year old) When I decided to do a simple system (new head unit, front and rears and single 8 inch sub) in my truck I wanted amps that were small and easy to hide. When I found these amps the size looked good and price was amazing and they had the Rockford Fosgate name that I remember so fondly so I gave it a try. Once I had it all hooked up and tuned everything I was blown away. I cant believe technology has come so far as to offer Class D amplification at such a great price. I have it running off a Pioneer head unit to a pair of 6.5 Infinity component speakers in the front doors and channel 3/4 are bridged running a single 8 inch Infinity sub in a sealed box. The amp was small enough to mount under the passenger seat and no one even knows its there. My sub is also in the factory location which other than the head unit, makes my system pretty stealthy, until you hear it. Some of my friends thought I had at least a pair of 10's and were expecting to find a much bigger amp in the back of the truck. Im very happy with the sound and power of this little amp. I may decide to upgrade everything and get the monoblock version of this for the sub and use all 4 channels in this for the full ranges in the doors. They also make "marine" versions of these amp which I will use for sure in my boat if I ever decide to build that system as well.

I love this little amp. I replaced the door speakers with 4 new Rockfords in my 2003 silverado and bought this amp to power them using my factory stereo. I had to buy a interface for the RCA outputs for better quality and sound control. The 4 door speakers didn't have the bass or volume I thought it would have but was a little better them OEM. I then bought a single 10 inch Kicker that was built to fit under the back seat and WOW!!! It vibrates the whole truck! Strangers tells me it is the clearest they have heard. I wish I bought the R600 for the extra sub-woofer output but didn't except to buy a bass speaker. The price I paid for the R400 was worth it because I hooked up one side of the power amp to the sub-woofer by bridging it and the other channel to the 4 door speakers. It work great and gives me unbelievable mid and highs. Very affordable system with good quality.

Amplifier arrived and the birth sheet stated 561watts. 561watts from a 400watt amp, I mean damn thats whats up. I always count on Fosgate for excellent products. I will always buy Fosgate products for my car audio needs. This is my second amplifier from RF, I currently have a 1200watt for my dual 10" P2D2's and they slap so hard. I decided to buy an amp for my door speakers. When the amp arrived the gain knobs looked a little tweaked and the amplifier turned out to be defective. Amazon immediately sent out a replacement. Amazon is the best place to buy anything in my opinion, excellent customer service and good prices. Update: Replacement arrived and installed. All wiring checked. Amp is working correctly at this time. Birth sheet stated even higher power then my original amp. Eventhough I received a defective RF product originally, I will continue to only purchase RF amps as I believe they make very high quality products.

I'm running mine 2+1 with two channels bridged for my sub. Seems like a decent amp for the money. It's physically a little smaller than the Audiobahn amp it replaced and it doesn't have a fan so we'll see how well it holds up (the Audiobahn amp survived 12 years). Soundwise...eh, it's an amp. Sounds fine. If I had to find something to complain about, the power terminals were a little too small for the 4ga welding cables I use for power (overkill, I know) and the 'remote' terminal doesn't work well with small-gauge remote wires. Not a big deal. Edit: I've had the amp a little less than 6 months now. A couple things that I've noticed since my original review: First, there seems to be some temperature-dependence on the output level. Now that the weather is warmer, I've noticed that my preferred volume level (as indicated by my head unit knob) is about 3dB lower than it was in, say, January. I notice this to a lesser degree, 1-2dB, on a daily basis if the morning is chilly and afternoon are very warm. Second, I've noticed an occasional "pop" or "crackle", like a vinyl LP, that comes across ch 1&2. I suspect it's on all channels but ch 3&4 are wired to my sub which is going to filter the high freqs. It's a subtle pop that's independent of head-unit volume level so it's only noticeable at lower volumes. About every 20-30 seconds or thereabouts. I briefly swapped back to the Audiobahn amp and didn't hear it but that could have been luck so I haven't completely ruled out the head-unit as the culprit.

Ive been running Fosgate amps since the late 80s and have never been disappointed. The sound great run cool and never have failed me. Using this unit in a 04 Mustang Gt Vert, replacing the factory MACH 460 system amps. This runs my front four polk component system speakers, with a second amp bridged mono running a Sub box in the trunk. The adjustability and output was perfect for my needs. price point was good too. Id recommend it to anyone and say most people could get away with just using this one amp paired with a head unit and speaker replacement and get an awesome system and big jump from a stock set up in most any vehicle.

I hooked this up to a pair of Focal 165's (60 watts RMS) on the front channels (no gain) and an old pair of Infinity Kappa 3-ways (111 watts RMS) on the rears (+2 gain I think). I was enjoying things on a 1-hr trip that first night, and halfway in, the rear speakers started cutting out. Even though I had read about this exact same problem in reviews on here or Sonic Electronix, I assumed it was the old Kappas' fault. Today, I put a voltmeter to the channels to see if it was putting anything out to the rear. I cranked up the volume to instigate the problem, and lost my front/right Focal. So it's not the speakers. I went to check onboard fuses, and the amp doesn't even have any! I appreciate that Rockford wanted to cut corners to make this amp more affordable, but it looks like they went too cheap this time. ps- my build sheet said this amp put on 533 watts. Don't be lured in by other people talking about how underrated these are because of the output pencilled in on their build sheet. When push came to shove, it's still a shoddy amp. Edit 2/28/13: I replaced this unit with the Pioneer GM D8604-4, and it's been solid. Better hardware, clear highs, good midbass, and no signs of fatigue for less money than the RF Prime.

I installed this awesome little amp in my wife's 2007 Chevy Avalanche. I bought it apprehensively because I've never purchased any of the Rockford Prime products. I've only ever purchased Punch and Power, but the reviews were good and I had a recommendation from a friend. What a great amp! I'm running the factory head unit to a Scoche line output converter mounted right behind the stereo that also had great reviews. Then to this amp which is powering Rockford Fosgate P1675-S, 6.75" mids and separates in the front doors which I Dynamatted and PPS4-6, 6.75" mids in the rear doors, also Dynamatted. I installed everything with the Schoche, GM specific speaker mounting adapters and pigtail adapters for a completely plug and play speaker install. With a little bit of line output converter and gain adjustment I've got an amazing sounding system. I also added the PacAudio Bluetooth integration adapter which gives me streaming Bluetooth audio including navigation through any phone and hands free calling all through the factory stereo.

GOOD AMP OVERALL..

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I have this amp in a Mazda extended cab pu truck...and I think it's great. Currently it is powering 2 pairs of JL Audio 5 x 8 coaxle speakers. It is the first time I powered them up beyond my Panasonic hu and the improvement is obviously fantastic. Within a weeks time I will have the speakers upgraded to JL Audios 6.5 component speakers...further update afterwards. Alright, some break in time has passed by and the 6.5 components are doing what they are suppose to be doing....this is a fantastic amp!! Being professionally installed I never hear any pops of any sort.. at high volumes nothing bad happens, I dont even think it gets hot! It was only a little warm after 2 CD played. I enjoy this amp and recommend it without hesitation !!

Love this amp. Great for the price. Pumping out tunes with no issues.

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