Customer Reviews

This was just what I needed for my system.

This amp was a replacement for a defective one I had installed. No extra noise! Perfect!!

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Rockford Fosgate Punch PBR400X4D

I've had Rockford Fosgate amps in the past for my motorcycles. They do a great job. Just make sure you get quality speakers to go along with the wattage of the amp you are getting

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Rockford Fosgate Punch PBR400X4D

very compact and easy to mount.

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Great Amp

I have this amp installed in a 2016 Chevy Silverado double cab. I have it connected to 2 6x9 in the front door and 2 6.5 in the rear and they really pack a punch. This little amp is powerful and I have no complaints about it. It was easy to stash behind the radio and easy to install.

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Guarded Optimism

Had a couple 2016 mfg years 300s before this that both blew. So hopefully this is better. They did put out though.

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Loud

Easy to install. Perfect for my 08 Ultra Classic.

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Packs some heat.

Packs a punch! Amazing how many watts this thing pushes out. The led lights make the setup a breeze. Runs hot and I'm sure they used materials made to take the heat. No buyers remorse with this amp.

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2003 Jeep TJ Rubicon - Very Impressed.

Short Version: I pulled my well used Pioneer GMA series 500w 4 channel amp and replaced with this unit. Blown away by the difference, not only in acoustic quality and power, but headroom! Also.this thing is tiny! More below: Long version:This amp powers my fronts (Rockford Fosgate 5.25" component speakers, column mounted tweeters, custom in dash mounts for mids/lows), and overhead pod mounted 6.5" Rockford Fosgate 3 ways. Pioneer digital receiver head unit with 3 RCA outs, F/R going to this amp, sub feeding Sound Ordinance Sub mounted in the center console. Mounting this amp took no time, used the famous TJ "under steering column" amp mount trick. Installer note: the output cables are only 6" long when connected to the amp. (I built a custom wire harness for my situation.)I also mounted the unit so the controls faced the driver's side door after playing with a few different variations. Use the setup tones! You'll be amazed by the new dynamic range of your system. I'm testing the installed system for bugs over the next few days. Will update this review with pictures when I finalize the build.

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Great little amp

I installed this amp in a '66 Mustang with a Retrosound head unit, component speakers in front and 6x9's in the parcel shelf. I wanted a compact amp with a small footprint and this fit the bill. The amp is quiet and has plenty of power for my set-up. It also was easy to install. I also installed a Kicker compact powered sub in the trunk. The set-up sounds great Lee in customer support was a huge help!!!!

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Rockford Fosgate Punch PBR400X4D

Fixing to order another, great product

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Rockford Fosgate Punch PBR400X4D

Fantastic amp. Have a 2006 ultra classic running 4 speakers. Loud and sounds great!

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Great Amp Great Price

Was searching for quit a while on the best amp to buy for my motorcycle. This amp was well worth the money . It's a 4 channel with a 2/ channel switch and is able to ve bridged giving you 200 watt rms per channel x 2. Highly recommend!!

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Rockford Fosgate Punch PBR400X4D

Great product, can't wait to install it in my Electra Glide

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Rockford Fosgate Punch PBR400X4D

Great product, when tuned right and paired with the speakers i bought it gives clear sound at high volume

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Tiny, powerful, and simplifies installation of door speaker wiring

I installed this in-dash behind the head unit and used it to power Punch P1692 and P1675 door speakers through the factory harness. It is surprisingly powerful for it size and greatly simplified system installation versus running door speaker wires to amps in the back of the vehicle.

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Rockford Fosgate Punch PBR400X4D

Received a used unit

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Rockford Fosgate Punch PBR400X4D

Small size but packs a big punch! Perfect fit in '19 Road Glide fairing, mounts underneath the factory BOOM GTS radio. Instructions detail connections, switch settings and input level adjustments for 2 or 4 channels. NICELY MADE!!!

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Small but impressive

I needed to give my speakers a little boost and this did the trick. I have a Jensen Media head unit and the amp was small enough to put behind it in the dash.

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Rockford Fosgate Punch PBR400X4D

After a temporary set up, very impressed with the upgrade of sound and enhancement in my '53 GMC. Thanks Crutchfield for the awesome products. Don W

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Rockford Fosgate Punch PBR400X4D

This is a great small amp ! Very clean sound to push a little more power. With the small package, it made installation a breeze

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Rockford Fosgate Punch PBR400X4D

Great service, product is as advertised!

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Rockford Fosgate Punch PBR400X4D

Very compact. Great sound.

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Great little amp!

The amp has the power I needed, tunable, in a small size. Worked great to have tucked away, leaving the truck looking clean and simple.

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Rockford Fosgate Punch PBR400X4D

Didn't get to install on the project I wanted , but was able to hook up to a different unit. Sounds great and small enough to put almost anywhere. I will be reinstalling on my Polaris as soon as my new head unit comes in.

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Rockford Fosgate Punch PBR400X4D

Compact and easy to install with an impressive amount of power. Just what I needed to upgrade the sound in my double cab Tacoma without any cutting/modification. Fit right in the glove box no problem.

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Missing manual?

I was surprised no detailed instruction manual came with this amp. I was expecting something to help explain how to set the crossover, and what the different crossover settings meant, but I couldn't find anything in the packaging. I expected a bit more from a reputable brand like Rockford Fosgate. I was also surprised since this provided both high level ins and outs, they only provided one set of high-level connectors, and one set of low-level connectors. I was able to convert the RCA connectors to high level, but I had to cut the RCA ends from the leads which didn't feel too good at the time. It was an unexpected hiccup and when you have your car all ripped apart to do an install these little gotchas can cause a big headache. The power seems to be pretty good, I'm not pushing this amp too hard though so I can't really comment too much on that.

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Crutchfield response on 4/20/2021

We're sorry you had issues with your installation. Whenever you encounter a problem with anything you purchase from Crutchfield, please contact our Tech Support team. They can help you solve the problem or set up a return within 60 days of purchase. Lifetime tech support comes with every Crutchfield purchase.

Great little amps

Love these little guys, pack a lot of punch and fit in tight spaces, I now have two this and a 300x1 and system sounds great

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Rockford Fosgate Punch PBR400X4D

Perfect size, fast shipping!

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Rockford Fosgate Punch PBR400X4D

Plenty of punch in this small package. Fit perfect in my HD fairing. Easy install and worth every penny.

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RF PBR400X4D

Very small amp that produces lots of power!!! Works Great for Me!!! Crutchfield is always the BEST!!!

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Underseat Amp for Mini!

Underseat amplifer installation in a 2015 Mini Countryman was a success! It fit perfectly in factory cutout underneath the seat. Just enough clearance all around with this little guy! Sounds fantastic compared to the dreadful factory installation. The amp wiring was a breeze once the manual was found online.

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Upgrades

Bought this to replace a 5 year old PBR300x4 on my Polaris ranger definitely a great upgrade with new features and easy to set up for anyone who don't do audio for a living only thing I had trouble with was finding the setup tracks wish there was a link or disc included with the amp but other then that back to rocking out

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Rockford Fosgate Punch PBR400X4D

They lined up just right thinking about adding two more pair

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Solid amp for this size class

The size/power ratio is really good with this amp. It's not gonna blow the doors off a full-size truck, but you can put it anywhere. Its basically one noticeable step up from head unit power. Installation and setup is really easy (if you have a CD player. Not sure about the setup if you don't). The first one of these I received had a bad channel. Tech support worked with me to diagnose it and replaced it really fast.

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Motorcycle Fairing

What a powerful amp in a small package. I was able to easily mount this in my motorcycle fairing. It drives two 6.5" speakers and two 3.5" speakers. Setup was easy. I have no engine whine or issues. Multiple crossover settings. No need for anything else.

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2018 Tacoma Double Cab

This amplifier produces incredible sound to the front RF 6x9s and rear RF 6.5! I have two issues that are most likely more related to the install process than the amp itself. I cut the factory speaker harness to connect wires Head unit to Amp: I Connected positive and negative speaker cables to four Moborest RCA screw terminals. I then connected these male RCAs to a female-female RCA adapter to connect the RCA lines to the amp Amp to Speakers: Butt connectors from AMP harness to 20' "CarWires SW900-0 18-Aqg 9-Conductor OWM car speaker wire". Speaker cable to head unit speaker harness. 1) I had tapped into the grey ignition wire from the factory harness to connect the blue remote amp wire. This connection caused the vehicle to not be able to get out of accessory mode when the engine turned off. I read on Tacoma World that one user found that the amp was back powering the ignition wire causing everything to stay on, but fixed it by wiring the blue wire to the cigarette outlet. I attempted this fix, but it did not work. After testing a series of accessory wires, I tapped into the front speaker positive wire and everything worked shut down as normal. I mounted the amp under the driver seat and connected the ground to the metal "hump" near the seat adjustment lever. 2) There is a slight hissing noise when there is no music coming from the head unit. It's not noticeable when music is playing, but I can hear it when the truck powers on

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best amp

Awesome product great sound with a ton of power.

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Best for its price and compact size

Amazing amp! Bought one then went on on buying 2 more! Can't go wrong with the power and frame size of the amp

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Big Power Small Package

Great amplifier in a small package.

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Rockford Fosgate Punch PBR400X4D

Nice amp. Good pwr for an amp this small. I have concerns about the plastic connectors. I believe they will get hot and melt leaving the amp useless.

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Rockford Fosgate Punch PBR400X4D

Great product

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Great amp choice

Great power for a little amp

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Rockford Fosgate Punch PBR400X4D

Runs great with my speakers.

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Rockford Fosgate Punch PBR400X4D

Great little amp. Fit perfectly under my drivers seat and provides plenty of performance for a small package!

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Great

Powerful little amp Fast shipping as always

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I am very glad that I chose this amplifier

This is the first quality sound system that I have had in a car. Adding the Rockford Fosgate Punch PBR400X4D 4-channel amplifier was definity the right choice,

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Rockford Fosgate Punch PBR400X4D

Got it with in a few short days ,and its everything they said it was,,thanks

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Worth it

Size and tuning ability make this a no brainer to run your speakers. Have this paired to some RF 6x8 that I purchased the car with and made a night and day difference.

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Rockford Fosgate Punch PBR400X4D

more than enough power to push the polk speakers I bought for my Spyder. I am very happy with the sound

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Rockford Fosgate Punch PBR400X4D

Great size and easy to hide and install

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Rockford Fosgate Punch PBR400X4D

Excellent performance in a small platform! Great value too.

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High Quality Tile Head Unit Ride

The perfect amp for the thump i wanted on my drives to and from. With the size of this beast being more than convenient.

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Awesome Amp

Great Amp! Pushing all 4 of my 6 1/2 infinity kappas on my 2012 Ultra Classic

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Perfect for compact installs

Great compact amp. I have it buried behind my headunit in my Kia Soul. I have a set of components in the front and a 3 way in the rear doors and they sound amazing. Perfect pairing for Rockford Fosgate punch door speakers. The "clean" setup let's you set the gains then forget about it. I added a powered sub to complete my system and I'm parking lot pimping.

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Rockford Fosgate Punch PBR400X4D

I have a full size pickup with a standard cab so I didn't need a mega size amp. This compact amp packs a punch in a small package. I'm very happy with the performance.

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Rockford Fosgate Punch PBR400X4D

I have this P400 running my 3 way Fosgate door speakers. It handles itself very nicely for such a small package. It's small enough to bury under my head unit, making installation a breeze. Great purchase, I've never had any issues with RF products in the last 25 years or so. Highly recommend!

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Rockford Fosgate Punch PBR400X4D

Works great. Radio now sounds awesome. Also love that Crutchfield told me everything I would need to get the job done

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Rockford Fosgate Punch PBR400X4D

Nice and compact, but strong for its size. Really woke up the Rockford P1 6.5 components.

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Rockford Fosgate Punch PBR400X4D

Great sound in a compact amp. Easy install for the Jeep. Fit right under the steering column behind the knee panel. Easy connections with good documentation. Just perfect.

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