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Rockford Fosgate Prime R400-4D 4 Channel Amplifier w/ Complete 4 AWG OFC Amp Kit thumbnail image
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5 star
86%
4 star
9%
3 star
2%
2 star
1%
1 star
2%



Durability
4.7
Value
4.8
Features
4.7
Design
4.8
Usability
4.9

Customer Reviews

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Good value

The following review is for XKIT44, which is a part of the bundle you are viewing.

This kit is true 4 gauge copper wire. Worked great for what I needed it for. Not much else to say besides it is also very flexible!

By Adam on March 14, 2014

121 found this helpful


Honda civic 2010 lx big 3

The following review is for XKIT44, which is a part of the bundle you are viewing.

This big 3 is a very nice setup and I haven't installed it just yet. Great quality wire and you can never go wrong with this product. The price is ok just a little over my budget lol

By Brandon on June 5, 2014

115 found this helpful


Honda civic 2010 lx big 3

The following review is for XKIT44, which is a part of the bundle you are viewing.

This big 3 is a very nice setup and I haven't installed it just yet. Great quality wire and you can never go wrong with this product. The price is ok just a little over my budget lol

By Brandon on June 5, 2014

108 found this helpful


Best kit money can buy

The following review is for XKIT44, which is a part of the bundle you are viewing.

This kit includes everything I needed for my 4-channel JL Audio amp. I love it. The look of the fuse holder is awesome and the braided cable protector is great under the hood too. The RCAs worked like a charm and I had plenty of speaker wire included. No complaints.

By Hamid on August 16, 2012

109 found this helpful


great

The following review is for XKIT44, which is a part of the bundle you are viewing.

Have not installed yet but it seems to be everything it claims to be. Did recomend itnto a friend but he didn't listen and spent way to much for a kitat a local best buy. Did a lot of research before I bought this kit and it looked like the best value for my hard earned money. Having not yet installed is why I didn't go all five stars. Soon it will be going into my 89 olds custom cruiser with 4 12s....

By Tyler on August 24, 2014

110 found this helpful


Great Amp Kit

The following review is for XKIT44, which is a part of the bundle you are viewing.

This is a high quality 4g amp kit for a great price .... nice 100 amp fuse box

By Kyle on June 13, 2014

108 found this helpful


Awesome kit!!!

The following review is for XKIT44, which is a part of the bundle you are viewing.

This wiring kit is the best I've used so far. It bends very easy in tight places and this is the size wire that I actually paid for. Don't waste $ on cheaper brands...NVX is AWESOME!!!

By jeremy on September 1, 2014

104 found this helpful


Great Complete Package

The following review is for XKIT44, which is a part of the bundle you are viewing.

I replaced all speaker wiring in my car with this kit. The quality of all the wires is very good. NVX is nice quality!

By detekk on June 29, 2013

105 found this helpful


great product

The following review is for XKIT44, which is a part of the bundle you are viewing.

This kit is very good and great quality. I would recommend this product for basic and some advanced systems.

By Brandon on December 30, 2014

108 found this helpful


Top of the line kit at decent price

The following review is for XKIT44, which is a part of the bundle you are viewing.

This kit has everything and is as good as you can buy. Better than jl, Rockford, stinger, and kicker. At a price less than or equal to those mentioned. True spec, silver tinned ofc

By Donnie on March 30, 2013

102 found this helpful


Quality Amp Kit

The following review is for XKIT44, which is a part of the bundle you are viewing.

This amp kit is high quality. Don't expect sound hiss or whining from you audio system if you use this kit. As long as you wire everything up right and run your wires properly, then this kit is the best for the money and you'll like the quality. High quality copper makes a big difference in sound quality and proper power distribution.
NVX deserves a pat on the back for making this one. Good job.

By Audio Enthusiast on March 28, 2014

86 found this helpful


Nice amp kit.

The following review is for XKIT44, which is a part of the bundle you are viewing.

The speaker, power, and ground wire are exceptional. Very flexible, easy to run, no smell, true to size and just look and feel nice. The RCA looks good too but the ends fit on my amp a little loose. All in all, the kit works perfectly and looks good

By Skip on September 17, 2013

84 found this helpful


Great product

The following review is for XKIT44, which is a part of the bundle you are viewing.

This was a great kit to deal with and would recommend it to all of my friends. This was a really good quality kit that will also look good in any install .

By Scott on July 16, 2014

84 found this helpful


Don't cheap out

The following review is for XKIT44, which is a part of the bundle you are viewing.

I hesitated to go with a true amp install kit until I matched this up with a Rockford Fosgate amp that called for a 4 gauge install kit. Just the ease of installation was well worth the price. For 4-gauge wire this is really flexible and easy to snake through the dash and under the hood. Don't believe me? Go to a big box hardware store and just see how in-flexible 4-gauge copper house wire can be. Plus, the difference in the protective jacket of the two is night and day. The NVX kit is a winner hands down. I didn't need to use everything in the kit. Some of the hardware bits I passed up. But I used all the rest. Glad I bought it.

By Paul on April 30, 2014

84 found this helpful


A++

The following review is for XKIT44, which is a part of the bundle you are viewing.

Great value and excellent product no doubt. Very flexible yet sturdy wires with lots of metal not filler jacketing. Worth the money no question.

By Sam on May 23, 2014

85 found this helpful


First time

The following review is for XKIT44, which is a part of the bundle you are viewing.

I was impressed with the quality and will use them every time .

By David on December 2, 2013

82 found this helpful


Great product.

The following review is for XKIT44, which is a part of the bundle you are viewing.

Materials are first class. This is the way to go. No cheap stuff. Everything you need for your install

By Reimann on August 12, 2014

79 found this helpful


Great Quality

The following review is for XKIT44, which is a part of the bundle you are viewing.

This is a great kit. The wires are great quality and it comes with shrink wrap and fuse holder. Even the speaker wire is great. If you're installing an amp, these are the kits you need.

By Corey on April 27, 2015 Checkmark Icon Verified purchase

71 found this helpful


Honda civic 2010 lx big 3

The following review is for XKIT44, which is a part of the bundle you are viewing.

This big 3 is a very nice setup and I haven't installed it just yet. Great quality wire and you can never go wrong with this product. The price is ok just a little over my budget lol

By Brandon on June 5, 2014

75 found this helpful


premiun kit

The following review is for XKIT44, which is a part of the bundle you are viewing.

Very good quality and fast shipping, i recommended buy nvx products

By jesus on May 7, 2015

72 found this helpful


This wire is great...

The following review is for XKIT44, which is a part of the bundle you are viewing.

This wire is awesome. .... The installers ran this wire to my 4 channel (Hifonics Brutus X-14 800.4) and monoblock (Hifonics BRD 2000.1D) it handles the current quite nicely. ... doesn't get hot either. .. definitely recommend this. ...

By Brian on September 9, 2014

70 found this helpful


very nice kit

The following review is for XKIT44, which is a part of the bundle you are viewing.

The kit is complete and the power & ground wire are very nice looking and high quality. They are very flexible too and not super stiff like many others. The fuse holder is nice and compact. The speaker wire is excellent too.
Just make sure you add your battery adapter!

By Steve on August 21, 2014

71 found this helpful


Top of the line

The following review is for XKIT44, which is a part of the bundle you are viewing.

This is an amp kit that will bring peace of mind as soon as you open it. This kit is top of the line without question. Look at all of the other brands and even try them (I have had kicker and fosgate kits) then compare to the nvx kit. Without question a must buy for anyone looking to actually get a much better product than what they paid for.

By Bass head on August 25, 2013

74 found this helpful


Awesome kit but could've used more speaker connectors

The following review is for XKIT44, which is a part of the bundle you are viewing.

Well the above wasn't really an issue besides me having to stop by the hardware store and getting more crimp connectors. But when paying the amount of money required for this kit, I would've expected more connectors. They only provide you with 4 crimp connectors. Yep, just 4, which accounts for the positive side of the speaker but then you're left in the dark for the negative side of the speaker. Weird. Otherwise they weren't kidding about the thickness of this cable. Does the job wonderfully for the Pioneer GM-D8604. Plenty of speaker wire...more than I needed. All other wires included in the kit were more than enough for my 03 Altima.

By RM on May 26, 2014

71 found this helpful


NVX SKIT44

The following review is for XKIT44, which is a part of the bundle you are viewing.

Great kit for the price but did not include a sub woofer cable so be sure to buy seperately. Cable was very flexible and easy to work with. Fuse was of good quality. Boots and connectors included. One of the rca cables had a bad connector

By notimetosail on July 22, 2013

78 found this helpful


Poor fidelity

The following review is for R400-4D, which is a part of the bundle you are viewing.

The product is OK for a kid, or for a very noisy environment, but not OK for a discriminating ear. I tried this route because I was trying to put the amps under a cover, I thought they would stay cooler. Nope. This guy gets hot. I would recommend to some, but not others.

By Matt on September 27, 2013

59 found this helpful


great

The following review is for R400-4D, which is a part of the bundle you are viewing.

This is my first amp of d class, but once tuned with scope or whatever It is this amp Gets it.

By lindy on December 23, 2013

55 found this helpful


Great amp kit

The following review is for XKIT44, which is a part of the bundle you are viewing.

This is a great amp kit, I got it bundled free with a JBL 5ez amp. Great that they included all wiring for 4 channels. I think I even wired the sub with the extra speaker wire from this kit (essentially got 5ch out of it). Oxygen free copper. Flexible wiring. It's great.

Some small cons:
The ground wire is way too short. Ended up using 0 gauge from my installer since he wanted to ground my amp to the frame of my car. This ground wire wasn't nearly long enough to do that. Ended up giving my ground wire from this kit to him, and using a 0 gauge wire he had. (shaved the 0g wire down so it would fit in my amp terminal).

Also the grommit for the power wire is super super tight, which isnt a bad thing. But we had to actually reverse the power wire to run it through the grommit after drilling through the firewall. The nice looking protection for that section of the cable we weren't able to use. We just used some plastic housing for the cable instead, and the part designed for the hood went into the trunk. It would have been nice to use the power cable as designed. Overall it worked out though.

Still a nice amp kit can't complain since it was bundled free! Speaker wire was great though!

By Samuel on September 4, 2015 Checkmark Icon Verified purchase

52 found this helpful


Good

The following review is for R400-4D, which is a part of the bundle you are viewing.

I have had this for a couple months now and it works great. I had to send it back for replacement after a week of owning it, not really sure what happened. Rockford fosgate is a reliable product usually but the first one started smoking after I had been using it for a while. Sonic electronix replaced it and it works great now. I do recommend buying a amp fan to go with it because it does get very hot after long periods of time. Sounds great though.

By Caleb on August 24, 2014

54 found this helpful


Good amp

The following review is for R400-4D, which is a part of the bundle you are viewing.

Great highs amp for powering small speakers. That's all I use it for and it's not even at the 12 o clock position. I would recommend it. Also I like the fact that it's compact in size.

By Edward on April 10, 2014

54 found this helpful


Awesome amp! Rockford all the way!

The following review is for R400-4D, which is a part of the bundle you are viewing.

I have been wanting to build an all Rockford system for a while, I knew I wanted to run a sub and four new speakers (All Rockford) but didn't want to buy two amps. This amp was the answer, pushing 500 RMS @ 2 ohms (according to the birth sheet) this thing rocks. I have two pairs of 4-ohm Rockford 6.5s running at 2-ohms bridged. So they are getting a good 65 RMS each, and they produce great highs and mid. For the lows, I have a DVC 10" Rockford sub that's being pushed a good 250 RMS. The sound is amazing, highs, lows, mids, everything all in perfect crisp harmony. This amp is absolutely amazing, not to mention its a perfect size. All my friends find it hard to believe that this little amp pushes so hard. Worth every penny!

By Matt on December 11, 2013

51 found this helpful


Like you need me to tell you to buy this amp

The following review is for R400-4D, which is a part of the bundle you are viewing.

Mated the Rockford Fosgate R400-4D to a Pioneer head unit. Wow! Amazing sound. Loud. Crisp. Clear. Everything you want in a sound system. Fits perfectly under the front driver's seat. It sounded great out of the box but is absolutely superb now that I've been able to tweak it a little bit. Installed the amp using an NVX Audio XKit44 with 4 gauge wire 4 channel connection kit. Stop reading reviews and buy this amp.

By Paul on April 30, 2014

50 found this helpful


small with a lot of power!!

The following review is for R400-4D, which is a part of the bundle you are viewing.

This amp is great.. I bough it to wire 4 Rockford Fosgate PPS8-6 to wire them at bridge 4ohms (2 speakers at each channel bridge) let me tell you..WOW!! This amp gives power to the speakers and I'm happy with that..I recommend this amp and for the price..NICE!!

By edrick on March 1, 2014

50 found this helpful


Good Amp!

The following review is for R400-4D, which is a part of the bundle you are viewing.

Fast shipping, never have problems with the amp, & puts out more than it says.

By Alex on November 22, 2013

50 found this helpful


Excellent Amplifier

The following review is for R400-4D, which is a part of the bundle you are viewing.

Got this amplifier to power my six speakers in my '99 Camaro; it does an excellent job! Ran the two rear pair in parallel and made a custom MDF rack to mount both this amp and the sub amp on the trunk deck just behind the back seat. My only frustration with the amplifier is the angle that the wires have to enter into the terminals at; they wires have to bend upward. It's just less convenient than having terminals coming straight out of the amplifier.

As far as sound quality goes, this amplifier brought my Rockford Fosgate Punch speakers to life! The clarity is brilliant and the crossovers work splendidly. I am very pleased with my purchase and will always look to Rockford for car audio components.

By Geff on October 2, 2013

50 found this helpful


Great Bang for the buck!

The following review is for R400-4D, which is a part of the bundle you are viewing.

Awesome power for such a small size. Fits in small space.

By Stacy on September 23, 2013

50 found this helpful


Great value!

The following review is for XKIT44, which is a part of the bundle you are viewing.

Quality kit for a reasonable price, wires are better quality as compared to others.

By James on April 1, 2020 Checkmark Icon Verified purchase

36 found this helpful


The Real Deal.

The following review is for XKIT44, which is a part of the bundle you are viewing.

IT IS BECOMING HARDER AND HARDER THESE DAYS TO FIND REAL COPPER INSTALLATION KITS AT AN AFFORDABLE PRICE. THEY ARE OUT THERE BUT MOST ARE OVERPRICED, AND SOME DON'T SPECIFY (CCA) or 100% COPPER. THIS KIT IS 100% AND A VALUE. NICE!!!!

By manuel on October 8, 2015 Checkmark Icon Verified purchase

36 found this helpful


Nice

The following review is for XKIT44, which is a part of the bundle you are viewing.

Great kit for the money, had everything needed and quality cable.

By Frank on April 3, 2018 Checkmark Icon Verified purchase

35 found this helpful


Both

The following review is for XKIT44, which is a part of the bundle you are viewing.

Both the wiring and capacitor made a huge difference mostly the wiring I liked it so much I went and ordered some 0 gauge wire

By Devin on July 28, 2020 Checkmark Icon Verified purchase

38 found this helpful


NVX XKIT44

The following review is for XKIT44, which is a part of the bundle you are viewing.

The product is very well built true 4g I would recommend this product for your car audio.

By Howard on June 14, 2020 Checkmark Icon Verified purchase

35 found this helpful


Great product!

The following review is for XKIT44, which is a part of the bundle you are viewing.

Very heavy duty wiring but still very flexible and easy to install. Would definitely buy this kit again

By Hootie on May 5, 2018

36 found this helpful


Quality wire and RCAs that do what they're supposed to do.

The following review is for XKIT44, which is a part of the bundle you are viewing.

This kit is perfect for any 4-channel amp kit. Very high quality wires and RCAs. I got this free from Sonic with the purchase of my amp. The only negative is that I actually bought (2) 5-channel amps, and had to purchase an extra RCA for each. Not that big a deal, though, as I knew this, and with it being free I didn't have a problem with that.

By Mark on September 18, 2015

35 found this helpful


NVX XKIT44

The following review is for XKIT44, which is a part of the bundle you are viewing.

Love nvx wiring......always up to standards and then some......highly recommended.

By Casey on March 22, 2020 Checkmark Icon Verified purchase

32 found this helpful


NVX XKIT44

The following review is for XKIT44, which is a part of the bundle you are viewing.

Very good and high quality would recommend more than enough to install amp under my passenger seat.

By Anonymous on May 13, 2018

32 found this helpful


Came free with amp

The following review is for XKIT44, which is a part of the bundle you are viewing.

Very good quality, extremely pleased with this amp kit. Came free with my JL amp but I would definitely purchase this amp kit in the future if needed.

By Chris on March 17, 2018

33 found this helpful


Quality Product

The following review is for XKIT44, which is a part of the bundle you are viewing.

Includes everything needed, and comes pre crimped, 100% copper true size.

By Dustin on February 8, 2018 Checkmark Icon Verified purchase

33 found this helpful


Good quality

The following review is for XKIT44, which is a part of the bundle you are viewing.

I like these amp kits because the wire is good quality and they give you enough to run all the way back if you have a large SUV. Suburban or excursion

By Bob on January 1, 2017

33 found this helpful


Nice quality and flexibility for tight bends

The following review is for XKIT44, which is a part of the bundle you are viewing.

This cable kit is high quality, appears to be durable and well designed to withstand engine compartment heat. The 100% copper power and ground cables are very flexible making tight bends to keep the installation neat. The length was fine for a Toyota Camry and similar sedan installation in the trunk. I mounted the amp behind the rear seat, cut off about 6 feet of the power cable and coiled excess RCA cables under the back seat. The kit included some plastic wire tires, firewall grommet, heat shrink, terminals and protective sleeves. Highly recommended.

By James on June 21, 2016 Checkmark Icon Verified purchase

34 found this helpful


Great Value

The following review is for XKIT44, which is a part of the bundle you are viewing.

Great kit for the money, with everything you need. Great OFC wires quality

By Anonymous on August 4, 2018 Checkmark Icon Verified purchase

31 found this helpful


Excellent product

The following review is for XKIT44, which is a part of the bundle you are viewing.

Everything comes with this kit that you would need for a single amp install. Wires appear to be durable. No road noise after hooking everything up. Price is fantastic as well.

By Ryan on April 13, 2018

32 found this helpful


nice kit

The following review is for XKIT44, which is a part of the bundle you are viewing.

Very happy with amp kit. Definitely recommend this product. Worked treated

By heath on March 18, 2017

31 found this helpful


Really good wire

The following review is for XKIT44, which is a part of the bundle you are viewing.

Awesome wire, really liked the extra protection on the power wire. Love the color. Little expensive. Used this for my 08 Evolution GSR, there was plenty of wire to run all 4 channels to each door from the trunk. Only downside is there were not enough wire connectors for the speaker wire, so you will have to buy extra from the hardware store.Very low resistance wire tho so if your looking for quality look no further.

By James on November 21, 2015

34 found this helpful


Nice kit

The following review is for XKIT44, which is a part of the bundle you are viewing.

Pleased with the kit as far as quality and price.. This was my first time buying a kit and rewiring my complete car it had everything I needed with extra to spare..

By Anonymous on February 21, 2019 Checkmark Icon Verified purchase

30 found this helpful


Nice kit

The following review is for XKIT44, which is a part of the bundle you are viewing.

In the past I've only bought power wire and rca's from knukoncepts. Great stuff. Got a JL XD 400/4 and it came with a free NVX install kit. It's absolutely a great kit, and I would not hesitate to buy NVX kits for another install. Time will tell how well the rca's hold up, but initial impression is high.

By Andrew J. on February 25, 2018 Checkmark Icon Verified purchase

30 found this helpful


Worked great

The following review is for XKIT44, which is a part of the bundle you are viewing.

Kit worked and did not have any issues. Plenty of wire!

By Lou on December 31, 2016 Checkmark Icon Verified purchase

30 found this helpful


Good wiring kit.

The following review is for XKIT44, which is a part of the bundle you are viewing.

The guy who did my install does some high end installs and he said they looked to like they were top quality. The shipping was a quick and easy process. Everything I’ve ordered from sonic has arrived quickly usually with 2-3 days

By Jason on February 17, 2020 Checkmark Icon Verified purchase

29 found this helpful


Good value

The following review is for XKIT44, which is a part of the bundle you are viewing.

Great amp kit wire nice and thick very flexible comes with all the wire you should need

By Anonymous on April 25, 2019 Checkmark Icon Verified purchase

30 found this helpful


Very good

The following review is for XKIT44, which is a part of the bundle you are viewing.

Good product... I recommend it warmly, quality, arrived neatly and cleanly and to purchase products from Sonic Electronics. Thank you very much

By Anonymous on April 21, 2019 Checkmark Icon Verified purchase

33 found this helpful


Seems good

The following review is for XKIT44, which is a part of the bundle you are viewing.

I've had other 4 gauge amp kits in the past. This one seems to be accurate in size of wire. And I'm an electrician so I think I know what I'm talking about. Definitely worth the money.

By John on March 11, 2018

30 found this helpful


Very nice kit

The following review is for XKIT44, which is a part of the bundle you are viewing.

I got this free with an amp purchase so my expectations were very low. After installing it I wouldn’t hesitate to buy it versus any of the name brand kits. And I was an installation manager for 5 years so I’ve installed lots of pricey kits.

By nick on December 7, 2017

30 found this helpful


Bad ass kit!

The following review is for XKIT44, which is a part of the bundle you are viewing.

The highest quality wire I ever encountered.
I think it way underrated at 1000 watts. Very nice craftsmanship.

By keith on October 25, 2015 Checkmark Icon Verified purchase

33 found this helpful


2nd NVX wire kit I've used

The following review is for XKIT44, which is a part of the bundle you are viewing.

I had purchased an NVX XAPK1D for a previous project car and for my Jeep I went with the NVX XKIT44 for my JAD800.4. These kits are the real deal and are very high quality. You get proper wire gauge copper wire that's not 50% insulation like the cheap stuff. It's copper too, not CCA, which I've had with lesser kits. The power and ground wire is super flexible for the size and having the 2 RCA's in a single wire makes it nice a clean to install. I love these NVX kits. This will not be my last.

By Jake on April 29, 2020 Checkmark Icon Verified purchase

28 found this helpful


Good kit for 4 channel amp

The following review is for XKIT44, which is a part of the bundle you are viewing.

Excelente kit, I use it in my jl audio amp rd4/400 And is exactly for my amp.

By Geras on April 11, 2018

30 found this helpful


Very nice wiring kit

The following review is for XKIT44, which is a part of the bundle you are viewing.

I have zero experience until now with NVX. The quality of the wiring kit on every level has made me curious about other NVX products. Plus the kit was actually a two channel kit from the manufacturer but to make it a four channel kit it came with a four channel twisted pair rca , so i now have an extra two channel tested pair ca cable. Great quality and product at a great deal!

By Gerry on March 16, 2017 Checkmark Icon Verified purchase

30 found this helpful


amp install kit

The following review is for XKIT44, which is a part of the bundle you are viewing.

NVX amp install kit made well good quality and a nice variety of pieces that gave me good versatility

By Anonymous on September 28, 2018 Checkmark Icon Verified purchase

28 found this helpful


Nice kit

The following review is for XKIT44, which is a part of the bundle you are viewing.

This is a great quality amp kit. Make sure you purchase the right fuse for your amp. Comes with 100 amp fuse.

By Kevin on June 6, 2016 Checkmark Icon Verified purchase

29 found this helpful


great amp

The following review is for R400-4D, which is a part of the bundle you are viewing.

All around a great amp , good sound quality, really lacks in the midrange area but still good quality well built

By michael on August 15, 2013

32 found this helpful


NVX XKIT44

The following review is for XKIT44, which is a part of the bundle you are viewing.

Good product worked well for the application no complaints at all.

By Anonymous on June 15, 2018

27 found this helpful


Great buy

The following review is for XKIT44, which is a part of the bundle you are viewing.

I bought two of these kits cuz I heard a lot of good things about the brand and the amp kits....very impressed I have a whole jl audio system and this was a great compliment to my system worth every penny

By Jay on September 15, 2016

29 found this helpful


Top of the Line AMP KIT, Highly Recommended.

The following review is for XKIT44, which is a part of the bundle you are viewing.

This is the best available kit in town & is my first purchase of NVX kits, I bought both NVX XKIT44 & NVX XAPK0, and guess what! I don't regret on my purchase.
I did a lot of research before I buy these KITS. way to go!
FIVE STARS *
highly recommended to all Basic & Advanced users.

By Ammar on November 17, 2015

29 found this helpful


rockford r400-4d

The following review is for R400-4D, which is a part of the bundle you are viewing.

this rockford amp is a great product. works well,looks good and stays cool.

By steve on July 23, 2014

30 found this helpful


702 LOUDNESS

The following review is for R400-4D, which is a part of the bundle you are viewing.

Great little amp, the crossovers built into this amp are outstanding, I can dial any music from thrash to rap, and a great price, thanks sonic electronix

By JB on November 19, 2013

32 found this helpful


High Quality

The following review is for XKIT44, which is a part of the bundle you are viewing.

If you want quality wiring - get this. You're only going to wire your car once so you might as well spend the money and get good, quality wiring. Well, this is it.

By Bill B on November 17, 2015

30 found this helpful


Right size for compact installs, but lacks in sound quality

The following review is for R400-4D, which is a part of the bundle you are viewing.

This amp is great if you're in a budget and looking for a small footprint for a compact install. But it significantly lacks in sound quality. For its size it's puts out gobs of power (birth sheet claims 514 burst power) but the sound is very... Flat. Midbass lacks clarity, highs became harsh relatively low in volume. I tried everything but I was disappointed from the get go. The old school (90's) Orion amp it replaced had MUCH better sound than this amp, much more "musical" really. It's not that this amp is terrible, it's just not great.
Maybe it would be a different story when powering a sub, but if you're looking for great sound quality look elsewhere or at least a higher end RF amp.

By Dohlo on May 16, 2014

31 found this helpful


outstanding performance

The following review is for R400-4D, which is a part of the bundle you are viewing.

this is my second Rockford product and I am very happy with the amp performs great and matches with the MB Quart speakers better than any other set up I have owned

By David on December 2, 2013

31 found this helpful


Great!

The following review is for XKIT44, which is a part of the bundle you are viewing.

Got this bundled in a deal with my NVX XAD41 amp, and couldn’t be happier.

The wire is ultra flexible and seems over sized, I used NVX brand wire ferrules for a cleaner look and good connection at all points where I would otherwise had a bare wire connection.

I really love the fuse holder, just be sure if you are installing sideways like say on a fender well you mount it with the side screws for the power wire facing where it’s easiest to access. I mounted mine to the fender with liquid nails LN-2000 and two #8 x 1/2 stainless steel screws after double checking it wouldn’t interfere with hood structure or anything else and drilling a pilot hole for the screws.

The RCA and speaker wire is excellent too though I made the mistake of running my RCAs along the door channel next to my new speaker wire runs which are amplified (100w RMS) and so introduced some noise until I moved them, not a lot but I had to turn down my amps gain to avoid some hiss. So if you for some reason can’t run them under the carpet you may want to order some RCA cables with say Mylar shielding.

I really recommend you get the install bay firewall grommets for this size just in case, they are absolute life savers. My best option was to run powerwire though the passenger floorboards firewall and they make me confident that I will have zero water intrusion.

By Frank R. on July 7, 2023 Checkmark Icon Verified purchase

24 found this helpful


Never received

The following review is for XKIT44, which is a part of the bundle you are viewing.

Couldn't tell you if this is a good kit or not. Have been waiting nearly a month and it appears I will never receive it. I guess no loss since it was "included free" with the amp I bought. Sadly, this was my first and last purchase with Sonic. After paying extra for next day delivery, then receiving the item 5 days after I ordered, we weren't off to a good start. They were supposedly going to send the kit out but it has not shipped, nearly 3 weeks after I was told it would. Received my next day delivery money back about 2 weeks after the order; at least I got that back.

By Ryan on November 24, 2021 Checkmark Icon Verified purchase

25 found this helpful


One of the best wires I’ve bought!

The following review is for XKIT44, which is a part of the bundle you are viewing.

Super slick look in engine bay enjoy this wiring alight

By Gio on April 3, 2022 Checkmark Icon Verified purchase

23 found this helpful


YES

The following review is for R400-4D, which is a part of the bundle you are viewing.

These are powering my NVX v-series speakers very well. There is not much to say - this amp can work like a slave without dying from the heat, literally. The sound quality is excellent (maybe since it's a Class D amp) and the features are good too. I have absolutely no regret purchasing this amp.

By Jonathan on July 1, 2014

28 found this helpful


Amazing amp

The following review is for R400-4D, which is a part of the bundle you are viewing.

Once again Rockford does its stuff. This amp is a monster and runs my Power 6x9s and 5 1/4" components extremely well. They aren't monster speakers by any means, but this amp keeps them perfectly fed at 75w to the components and 100w to the rears...very, very loud! Keeps the music as loud as and clear my subs keep their bass, which is nice because now I can actually hear the music rather than bass alone.

By Richard on May 27, 2013

28 found this helpful


Great Product

The following review is for XKIT44, which is a part of the bundle you are viewing.

The wiring kit was great. The time install video was helpful. Thanks.

By stefano on February 1, 2023 Checkmark Icon Verified purchase

22 found this helpful


Great amp

The following review is for R400-4D, which is a part of the bundle you are viewing.

Came 514w out the box gain is matched to the deck at 1 and never gets hot.

By Brooke on June 22, 2014

27 found this helpful


Amazing amp

The following review is for R400-4D, which is a part of the bundle you are viewing.

If this is what the new prime series is offering I couldn't imagine what the new power series is going to offer. Got this amp pushing a set of t2 components and a set of 6x8 primes and wow sounds way better now. Had a Rockford PBR300x4 but it messed up? Sonic was quick and great on the return if you plan on getting the PBRx4 just spend the extra $15 and get this great choice on my part.

By jacob on March 14, 2013

27 found this helpful


The following review is for XKIT44, which is a part of the bundle you are viewing.
By Alex on November 2, 2023 Checkmark Icon Verified purchase

21 found this helpful


great amp!

The following review is for R400-4D, which is a part of the bundle you are viewing.

i bought this amp to power my t2-652s and spr-17c. this amp delivers and then some. for the price and power this amp puts out i def. recommend this product. i have been a fan of rockfords amps and speakers since i started building my audio system. they deliver top quality products. especially there prime amps. the size is another plus in my book. i have not have any problems with this amp or any of rockfords products. to put the icing on it all ,sonicelectronix prices are especially why i keeping coming back to buy more products!! thanks!!

By jorge on February 5, 2013

24 found this helpful


The following review is for XKIT44, which is a part of the bundle you are viewing.
By michael on October 15, 2023 Checkmark Icon Verified purchase

20 found this helpful


Nice!

The following review is for XKIT44, which is a part of the bundle you are viewing.

If you are looking for a cheap $30 amp kit, this item is not it. NVX amp kit is well made with love. Plus, the NVX kit comes with everything needed to complete your installation. I would recommend it.

By Reyze on May 14, 2023 Checkmark Icon Verified purchase

20 found this helpful


702 LOUDNESS

The following review is for R400-4D, which is a part of the bundle you are viewing.

I got this amp because my 50 x4 four channel was out,sure glad I did,75 x 4 ,much nicer ,could not believe my ears,an for the price,also john was very helpful helping match the watts to the speakers I have thanks again sonic electronix

By JB on November 11, 2013

24 found this helpful


Excellent amp for the money!

The following review is for R400-4D, which is a part of the bundle you are viewing.

I bought this amp to replace a PPI P600.2 because I needed 2 more channels to run an active front stage. I'm powering a JBL P660C component set ran active from a MiniDSP. After I adjusted my gains the noise floor was basically nonexistent and my speakers have never sounded better. They get louder than I would ever want and sound great doing it.

The amp is tiny, even smaller than I expected, and fits under my driver's seat with plenty of room around it. It never gets even warm to the touch, even after playing music for over an hour on hot summer days with the windows down. The birthsheet said it produces almost 550 watts and I believe it. If you need a small 4 channel amp that has plenty of power for not much money, you can't do much better than this!

Also, I own the Rockford Fosgate R1200-1D that powers my 2 Polk MM1240 subs and all of the same things hold true for it as well.

By Vince on September 17, 2013

24 found this helpful


good

The following review is for R400-4D, which is a part of the bundle you are viewing.

has the power, quality and runs cool, but it lacks in the mid-low range frequencies.

and to the guy who says he was only using about 15% of amp power u need to learn the gain is not a volume, it is used to tune the amp to the radio outputs, higher voltage = lower settings, lower voltage = higher settings

By p on February 24, 2013

24 found this helpful


Small and Powerful

The following review is for R400-4D, which is a part of the bundle you are viewing.

I'm so happy I finally decided to add an amp to power my Polk db series speakers in my truck; it makes a world of difference in the sound quality, especially in the amount of bass added to my front stage. I went with this amp because I needed a small amp in the 50-75w rms range that would fit under my seat. This amp does not disappoint! I knew it would be small, but I wasn't prepared for how compact this little thing would be. Even with this amps small size, heat is not a problem. This amp is Class D, so it runs very efficiently, and therefore very cool. It just gets warm to the touch and has plenty of power for pretty much any system. The amp sounds great, although there is slight distortion at zero volume, but once music is playing this sound is inaudible (this distortion is probably more noticeable because I have 2v preouts and have to turn the gains a little higher than if I had 4v ones). Build quality is extremely solid and I expect this amp to last forever, my only gripe is that controls on top are a little flimsy, but this isn't a big deal at all. Overall this is a great little amp. If you're in the market for a small and powerful amp look no further than the R400-4D.

By Jonah on November 26, 2011

25 found this helpful


ford ranger

The following review is for R400-4D, which is a part of the bundle you are viewing.

i need a small amp to fit under my seat that does not get hot and This the one

By ceon on August 4, 2014

23 found this helpful


Not too bad

The following review is for R400-4D, which is a part of the bundle you are viewing.

Handles everything and can push T1675-S's and T165's quite nicely. After not using the gain as a volume control and setting it properly i could push the speakers to there limits with clear highs and lows and no distortion.

By james on May 27, 2013

21 found this helpful


Outstanding amp

The following review is for R400-4D, which is a part of the bundle you are viewing.

Clean, clear, and loud. Great amp. I'm using it to power 4 infinity 6.5 inch two way speakers in the radar arch of my boat. Factory tested at 502 watts RMS. The only amp I have that is better is the R600 (same amp more power). Definitely go for 2 guage wire and a second battery if your getting more than one.

By Steve on February 15, 2013

21 found this helpful


very strong but maybe something wrong with it

The following review is for R400-4D, which is a part of the bundle you are viewing.

Had this hooked up to 4 rockford fosgate T1675's that say they handle 75 watts rms each. this amp puts out 75rms X 4 but i had the gains on 2. 2 out of 11 and was insanely loud. Anyways, speakers started sounding very bad after about an hour and the amp started smoking really bad. keep in mind that i was only using about 20% of the amp capability so i was only putting around 15 rms to each speaker. i have been hooking up stereo systems for 15 years.

By Big E on October 22, 2012

21 found this helpful


Do not buy

The following review is for R400-4D, which is a part of the bundle you are viewing.

I purchased one of these and had it hooked up to two pair of 6.5 Pioneer components for ABOUT 15 MINUTES and it completely fried itself. I'm not sure what to say about this other than the RF quality control is not the same as it used to be. I have had several RF amps in the past and never been disappointed until now. The up side is that it failed immediately instead of 13 months after purchase. Sonic was great to work with and they hooked me up w/a RMA to get my money back. I replaced this w/the JL XD400 and it blew this thing out of the water; no comparison. However, the JL amp was more. All that said, you get what you pay for. Do not buy this amp *unless your only pushing a pair of tweeters.

By Ben on May 11, 2012

20 found this helpful


Great AMP

The following review is for R400-4D, which is a part of the bundle you are viewing.

AWESOME AWESOME AWESOME AMP!! Produced way more power than it was rated..LOVE the amp...thanks Sonic!!

By Bass-on-tha-boat on September 4, 2012

18 found this helpful


The following review is for XKIT44, which is a part of the bundle you are viewing.
By Jorge on March 22, 2024 Checkmark Icon Verified purchase

13 found this helpful


The following review is for R400-4D, which is a part of the bundle you are viewing.
By Anonymous Shopper on September 16, 2023

5 found this helpful


Works great

The following review is for R400-4D, which is a part of the bundle you are viewing.

Definitely puts out the power and clarity just ground it good

By Anonymous on December 2, 2019 Checkmark Icon Verified purchase

5 found this helpful


Fosgate Prime R4004D

The following review is for R400-4D, which is a part of the bundle you are viewing.

Great amp professional sound quality well built with solid terminal connections

By Anonymous on September 6, 2019 Checkmark Icon Verified purchase

5 found this helpful


Amazing

The following review is for R400-4D, which is a part of the bundle you are viewing.

This amp is severely underrated mine came with the test sheet and tested at 567 watts! It cleared up my Skar components tremendously

By Anonymous on July 8, 2019 Checkmark Icon Verified purchase

5 found this helpful


Amazing

The following review is for R400-4D, which is a part of the bundle you are viewing.

I highly recommend this amp to pair up with door speakers the cross over on the amp really allows you to clear them up and I’m running it at less than half the power !

By Anonymous on July 4, 2019

5 found this helpful


Great amp

The following review is for R400-4D, which is a part of the bundle you are viewing.

perfect for my highs I would recommend for anyone looking for clean sound.

By Anonymous on April 8, 2019 Checkmark Icon Verified purchase

5 found this helpful


Works great!

The following review is for R400-4D, which is a part of the bundle you are viewing.

I would recommend this to anyone who is getting a system it worked really good and gave me the Watts I needed. And it made my set up look good.

By Anonymous on August 21, 2018

5 found this helpful


Rockford Fosgate Prime R400-4D

The following review is for R400-4D, which is a part of the bundle you are viewing.

It was exactly what I was looking for and work GREAT!!

By Anonymous on August 6, 2018

5 found this helpful


Big clean power

The following review is for R400-4D, which is a part of the bundle you are viewing.

If your looking for big clean power without all the bulk of a monster size amp then this is the amp for you ,doesn't get hot or shut down

By Rafael on September 7, 2017 Checkmark Icon Verified purchase

5 found this helpful


Nice little amp with small footprint.

The following review is for R400-4D, which is a part of the bundle you are viewing.

Very nice little amp! Birth certificate states that is way more powerful than listed. Mine came in at 98 watts rms per channel. Rockford Fosgates amps always put out more power than listed. I paired this amp with 2 sets of Rockford Fosgate P-1683s 6X8s in my Ford Explorer along with a Kicker CX300x1 mono block amp, a single 10 db1040 in a Atrend vented box. I can honestly say that the sound is awesome. You can feel the bass in your chest and the clarity through the 6X8s is clean and clear. You can hear me coming up the road. I have read one other review about the amp getting hot, no such issue here!! He must have the amp set up wrong. This little amp is totally worth the money, money well spent!!! I have had this amp in my truck mow for a period of 9 months now with no issues at all.

By Paul on May 6, 2017 Checkmark Icon Verified purchase

5 found this helpful


Loud af

The following review is for R400-4D, which is a part of the bundle you are viewing.

Way louder than my head unit...tons of bass and trebble... got it connected to 4 cresendo symphony speakers.... sounds great... I was worried about class D for mids and highs but rockford know their stuff...

By Kelvin on February 24, 2017 Checkmark Icon Verified purchase

5 found this helpful


Fantastic Amp!!

The following review is for R400-4D, which is a part of the bundle you are viewing.

I would not have expected so much from Rockford Fosgate's prime series, but this amplifier puts out the wattage it advertises with phenomenal quality to my T-675 components. Definitely worth $165!

By autolycus555 on January 14, 2016

6 found this helpful


The following review is for XKIT44, which is a part of the bundle you are viewing.
By david on September 7, 2024 Checkmark Icon Verified purchase

3 found this helpful


The following review is for XKIT44, which is a part of the bundle you are viewing.
By craig on September 4, 2024 Checkmark Icon Verified purchase

3 found this helpful


Good product great prices

The following review is for XKIT44, which is a part of the bundle you are viewing.

I have not received this set yet, however I have had one before and they are a great value, well made.

By Brett on November 22, 2025 Checkmark Icon Verified purchase

1 found this helpful


Came free with DSP Amp

The following review is for XKIT44, which is a part of the bundle you are viewing.

The wires in the kit are decent quality and are plenty for the amp it came with. However I already had an amp and was adding the new one. This meant I needed larger power cable than the 4awg.

By Dave on August 29, 2024 Checkmark Icon Verified purchase

1 found this helpful


Great stuff

The following review is for XKIT44, which is a part of the bundle you are viewing.

I've never used NVX products before but when this kit arrived I was seriously impressed. Everything is high quality and right up there with other top brands I have used for wires and fuse holders. Lots of strands in the wires as well, they didn't cheap out. Great kit.

By chris on May 30, 2024 Checkmark Icon Verified purchase

1 found this helpful


NVX OFC Amp Kits for the win!

The following review is for XKIT44, which is a part of the bundle you are viewing.

Every install I do is using one of these amp kits. My buddies always consider going CCA but I explain to them the benefits of OFC and how NVX makes it affordable but yet very reliable with excellent quality!

By Carson on March 28, 2025 Checkmark Icon Verified purchase


The following review is for XKIT44, which is a part of the bundle you are viewing.
By Shem on January 27, 2025 Checkmark Icon Verified purchase


There kits always available ship fast

The following review is for XKIT44, which is a part of the bundle you are viewing.

Love having a complete to install my amp even includes patch cables. Alot of more expensive one never include the cable and always another purchase to slow down install.

By michael on December 12, 2024 Checkmark Icon Verified purchase


The following review is for XKIT44, which is a part of the bundle you are viewing.
By Richard on December 11, 2024 Checkmark Icon Verified purchase


The following review is for XKIT44, which is a part of the bundle you are viewing.
By Heriberto on October 28, 2024 Checkmark Icon Verified purchase


Quality Product and Price

The following review is for XKIT44, which is a part of the bundle you are viewing.

Product comes packaged well and is great quality for the price. The flexibility makes it easy to work with while also being a solid constructed wire kit. Sizing is what it says it is and from what I can tell it is definitely oxygen free copper. Also like the extra protective covering for the installation portion on battery side of the firewall with well crimped ends already available to hook up n go!

By Dakota on October 18, 2024 Checkmark Icon Verified purchase


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Modern vehicles often require specific brackets, wiring harnesses, and mounting solutions. A fit guide ensures:

  • You see only parts engineered for your exact vehicle
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Whether you're replacing a factory stereo or upgrading your entire audio system, the Fit Finder eliminates uncertainty.