Customer Ratings & Reviews

Good value

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!

Honda civic 2010 lx big 3

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

Honda civic 2010 lx big 3

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

Best kit money can buy

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.

great

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....

Great Amp Kit

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

Awesome kit!!!

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!!!

Great Complete Package

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

great product

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

Installed on 2 cars 1994 Miata and 2005 Scion XB

I installed both amp in both cars and the installation was very easy do to great electrical connectors both cars sound is very good using Pioneer double din touch screen head unit. Sound is very clean and has plenty of power both Amos was installed in the back 94 Miata in the trunk and on the 05 Scion XB also in t h e back. I love the quality of the J&L amps would buy again.

By Marco on March 11, 2023 Verified purchase

Top of the line kit at decent price

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

Quality Amp Kit

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.

Nice amp kit.

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

Great product

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 .

Don't cheap out

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.

A++

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

First time

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

Great product.

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

Great Quality

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 Verified purchase

Honda civic 2010 lx big 3

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

premiun kit

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

This wire is great...

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. ...

very nice kit

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!

Top of the line

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.

Awesome kit but could've used more speaker connectors

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.

NVX SKIT44

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

Amazing sound!

This amp is phenominal. I am blown away with how well it performs. I believe in name brands when it comes to sound, and J/L hit the nail on the head with this one. I am running two subs bridged in two channel mode and it has a punch. QUALITY like this is meant to be heared. I wonder how great it would sound on my 6x9's. Makes me wish i still had my jl1000/1 to pair it with. Thanks sonicelectronics! You made my day.

By Ethan on August 7, 2021 Verified purchase

Great amp kit

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 Verified purchase

You cannot go wrong with this one.

I had been driving around in my Tundra for 3 years with the stock system. Friend picked my up one day with a proper system installed and I started researching parts the next day. Ended up completely stripping the interior out and upgraded from front to back.
Kenwood DDX9907XR HU, Focal Focal ES 165K components up front, JL coaxes in the rear, JL Audio CS112LG-TW3 Sub powered by a JD500/1 and this amazing little JD400/4 pushing the components and rear fill.
To say I am impressed by this amp is an understatement. JL made setting the gain idiotproof and this will play as loud and clear as my 51 Y/O ears can handle.
Cannot recommend enough.

By Ken on March 3, 2022 Verified purchase

Awesome Service

Was able to order a rush order and this amp in a breeze... Travis was so friendly and helpful, will highly recommend Sonic Electronix.

JL Audio JD400/4

Clear sound, very pleased.. Easy install, instructions need to be worked on a little..

By Barton on August 10, 2020 Verified purchase

Unbelievable!!!!!!

JL Audio has always been an awesome brand and even better when you can get it at a great price!!! Thank you Sonic Electronix!!!!

By Eddie on October 6, 2022 Verified purchase

Very happy!

Paired with my JL C2 650's, this thing rocks! Super easy to install and delivers that JL quality that you know you're always gonna get. For the price, you can't beat this baby!

Looks and Feels Awesome!

Have not installed this amplifier yet, but based on JL's reputation for quality and the look and feel of this amplifier I know it will perform well.

By Roberto on August 3, 2020 Verified purchase

Nice amp.

Wow! I'm amazed at how this amp got highs & mids sounding crispy and very detailed. I highly recommend this 4 channel amplifier to anyone who looking for one. And the price is very reasonable as well. Two thumbs!!

By Anthony on May 2, 2022 Verified purchase

Immediate Upgrade!

Buy, buy, buy! You get what you pay for. All 400/4 amps are not the same. JL for the win.

By Reyze on May 14, 2023 Verified purchase

Great value!

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

By James on April 1, 2020 Verified purchase

The Real Deal.

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 Verified purchase

Both

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 Verified purchase

Nice

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

By Frank on April 3, 2018 Verified purchase

NVX XKIT44

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

By Howard on June 14, 2020 Verified purchase

Great product!

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

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

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.

NVX XKIT44

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

By Casey on March 22, 2020 Verified purchase

NVX XKIT44

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

Came free with amp

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.

Quality Product

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

By Dustin on February 8, 2018 Verified purchase

Good quality

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

Nice quality and flexibility for tight bends

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 Verified purchase

Great Value

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

By Anonymous on August 4, 2018 Verified purchase

Excellent product

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.

nice kit

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

Really good wire

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.

Nice kit

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 Verified purchase

Nice kit

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 Verified purchase

Worked great

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

By Lou on December 31, 2016 Verified purchase

Good wiring kit.

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 Verified purchase

Good value

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

By Anonymous on April 25, 2019 Verified purchase

Very good

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 Verified purchase

Seems good

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.

Very nice kit

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.

Bad ass kit!

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

By keith on October 25, 2015 Verified purchase

2nd NVX wire kit I've used

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 Verified purchase

Good kit for 4 channel amp

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

Very nice wiring kit

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 Verified purchase

amp install kit

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 Verified purchase

Nice kit

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 Verified purchase

NVX XKIT44

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

Great buy

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

Top of the Line AMP KIT, Highly Recommended.

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.

High Quality

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.

Great!

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 Verified purchase

Sonic is the only place I do business with after initial order

This amp is outstanding, clipping feature allows you to get the most out of your amplifier

By Dominick on April 29, 2022 Verified purchase

Never received

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 Verified purchase

Amazing amp!

Is hooked upto 4 Kappa 60 CXM's. These speakers sound amazing on this amp. Is easy to setup and use...great for the money!

By Chris on September 7, 2023 Verified purchase

One of the best wires I’ve bought!

Super slick look in engine bay enjoy this wiring alight

By Gio on April 3, 2022 Verified purchase

Great Product

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

By stefano on February 1, 2023 Verified purchase

Nice!

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 Verified purchase

Unreal quailty

This amp is awesome. The sound in quality is like You’re in person

By Matt on October 29, 2024 Verified purchase

Great Value.

Great Value. Fast shipping. Plenty of power for four door speakers.

By Matt on January 6, 2026 Verified purchase

Excelente

Todo llego sin ningún problema ,a mejorado mi experiencia de audio por completo, ahora solo a disfrutar

By kys on December 9, 2025 Verified purchase

Good product great prices

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 Verified purchase

Quite an improvement

I have a 2012 Toyota Tundra with a Kenwood DDX5707s h/u, Focal 165AS3's in the front, some and Pioneer Ts-a1687s 6.5" in the rear. I installed a Planet Audio PL1600.4 class D amp to power it all. It was ok, but I knew those Focals could do much better. Then that amp just died on me. It had not even been installed in my truck for a year. I do go 4x4'ing on the beach, but we don't get hot here in NorCal.

I installed the amp in the same location as the PL1600.4 and the JD400/4 takes up less space under the passenger seat. My first impressions are that the Focals do not sound like the tweeter is pulling double-duty. The mids and the woofers are much more balanced. This is a very clean sounding amp. So far I am very impressed. Bass is next on the list.

By Tim on October 10, 2025 Verified purchase

Powerful, Clean, and Reliable – Perfect 4-Channel Amp!

This amp completely transformed my sound system. The JD400/4 delivers clean, detailed power to all my speakers, with zero distortion even at high volume. Setup was straightforward, and the controls are intuitive. I’m running Hertz and MB Quart speakers and this amp pushes them effortlessly. JL Audio never disappoints – solid build, great performance, and unbeatable clarity. Highly recommended for anyone upgrading to serious sound.

By Boris on August 6, 2025 Verified purchase

Awesome Amplifier

I purchased a JL Audio JD400 amp, and I must say it was super easy to install, very easy to adjust and amazing sound quality, I've always had a wonderful experience when ordering from Sonic Electronics , I will be a customer for life, if your in the market for a amplifier this is a great one to get for a good price, thanks for the fast shipping and great customer service.

By Bensil on May 31, 2025 Verified purchase

JL Audio

Installed and works fantastic!

By Julio on January 9, 2025 Verified purchase

Jl audio never fails .

Has Jl audio amps before and decided to go with it again on my work truck .

By Jose on December 9, 2024 Verified purchase

Came free with DSP Amp

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 Verified purchase

It’s JL audio tried and true brand

Compact 4 channel to run my components is just what I needed. Shipping was crazy fast thank you!!

By derek on July 20, 2024 Verified purchase

Great stuff

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 Verified purchase

Great amp for mods and highs

For Tia installed and it is great! Easy to set up and the filter works great and the mods and jigs never sounded so good! Very well pleased and shipping was extremely fast!

By Shane on April 9, 2026 Verified purchase

NVX OFC Amp Kits for the win!

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 Verified purchase

There kits always available ship fast

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 Verified purchase

Quality Product and Price

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 Verified purchase