Customer Ratings & Reviews

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

Solved that static alternator whine issue

My brand new car's factory sound system sounded terrible so I decided to upgrade it. I had to keep my factory radio because the car's functions depend on the screen/radio of the car. I installed a JL audio 300/4v2 along with Focal components and after I was done installing everything, there was a tremendously loud static noise coming from the speakers, even with the volume all the way down. When I would rev up the engine, it would make a whistling, whining noise from the alternator. I spent 2 days trouble shooting the problem. Separating wires, re-grounding, running new wires, adjusting gains, etc. and none of that worked. I saw this LOC from NVX and decided to give it a try since it claimed to have a digital noise filter feature. Man, as soon as I installed I was blown away. That annoying noise was GONE! The music sounds crystal clear now. I purchased that particular set up because I wanted an SQ sound system and now it delivers that very clean music with absolutely NO distorting noise. I was stressed out for 2 days wondering how to fix it. If you are in the same situation, buy this LOC. It will end your problems with all that unwanted noise. Forget those "solutions" people talk about all over the internet about re-grounding, ground isolation, and all that junk. This LOC solved it for me. It was so easy to install, it has adjustable gains, and feels very sturdy. Even if you turn the gains all the way up on the LOC, you will still hear no unwanted noise.

Great value

Fast shipping works great with no problems. I would order other if i ever needed it

Ok starter Kit

It's a ok kit to buy but check the RCA jacks my kit came defective one pair of RCA jacks failed. When I finished completely installing it in my truck and turned on the head unit only to fine out 3 of my 4 channel amp was working had to take out the multimeter tested the Amp then uninstall all the head unit tested RCA jacks and one pair was defective I would assume that they would work they are New. So save time and test the RCA jacks for continuity.

By JESUS C on December 28, 2020 Verified purchase

Great value!

Fast shipping and I recommend it for anyone. Everything u see in the picture is what u get.

Good Value Kit!

Everything I needed and good quality wire, not like some other cheap thin gauge wire you get in similarly priced kits elsewhere.

By Adam on February 1, 2018 Verified purchase

Works as said

Everything needed for a 4 ch amp install. Better quality than other cca kits I have used before. Nice thick strands.

Excellent product

Easy to install in factory stereo. Great product. No noise at all. High fidelity sound.

Great deals

I recommend this to anyone. The shipping is fast and you always get a good deal.

perfect!

No unwanted noise, soft turn on and off, cant even tell its there. It does its job seemlessly in my 09 Jeep Grand cherokee with boston acoustics system. I wanted full range sound out of the door speakers so I pulled off the output from the factory amp of the dash speakers and rear speakers. All speakers are now full range and amplified with a kicker ZX350.4. I can keep the gain super low on the amp and cross over the speakers to keep the bass out with the amp controls. This LOC made all that possible to use the kicker amp with NO NOISE.

Good Converter

I bought this to replace another one that I bought that had terrible noise and poor quality. This one however is great and works as you would expect. Spend the extra couple of bucks and get this one

Great value

Included in a bundle package for the price well worth it

By Chad on September 15, 2017 Verified purchase

bueno

Me gusto lo fácil que es instalar lo y los resultados son bienos

NVX Output converter

This converter was easy to install plus it added power and more clarity to my speakers. It has a remote wire for my amp.

Perfection! NVX is the best!

Durable, small, easy to use, fun, quality build and sound! Great LOC! No unwanted noise! Love the gain controls and remote turn on for an amplifier! Works wonderfully with my NVX JAD900.5 and my NVX 4 channel rcas! NVX is the only way to go! I just can't get enough of NVX! Thanks NVX and Sonic Electronix for all of your support!

Awesome Buy

It was everything I needed one package for a great price

Worked great!

I installed this unit on my boat due to my radio had to pre amps.. Easy to wire although theres a bunch of wires. Works great for triggering your amp though! My radio put out 160W so I left all my channels on the unit turned down. Would highly recommend!

Works as said

Works good and is high quality cca wiring, better than many others I have used. Fine for about a 400 watt rms 4 ch amp set up. Larger go with 4ga to be safe.

By brian on November 15, 2015 Verified purchase

Digital Converter

I used this to convert wired to RCA. This device worked great. I eventually replaced the factory head unit with a Pioneer that had RCA outputs.

Good value

Good value. All the stuff you need for a couple of speakers and a sub to an amp. Easier than buying it individually.

By Jason on April 11, 2020 Verified purchase

Junk

Upon receiving product, I carefully read instructions. Installed unit as directed in instructions. Product did not work, so I cut the unit out and threw it in the trash.

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

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 kit!

Comes with everything you need to get going at a great price

By Tombo on April 28, 2020 Verified purchase

Bad quality

The wiring harness was bad out of the package. I could move the harness around to make it work, but I didn't want to install it. Had to run to a local big box store to buy another off brand one.

Amp installation kit

Belva did a great job with this 4 channel amp wiring kit. Had more than enough lengths on all wires. Terminals are solid. Will buy this kit for now on for my 4 channel amp installs.

Good product

I have not installed it yet. But it feels well, the quality of the materials is good, I will install it soon

Ex-Flock-4

Good unit, Good price. I have a 4 channel Amp, this is a 4 channel unit.
All 4 channels work. For $14.99 I did not expect it was going to do the dishes for me too.

Nice Kit

Worked great in my 1997 Tahoe. Had enough cable to put the amp under the passenger seat. If you're trying to put it in the cargo area, you'll need more cable.

By Anonymous on September 16, 2019 Verified purchase

Great product and cheaper than the other ones I have seen

This product is easy to install and is made simple due to the wires match the colors of the speed wire that I bought to get the correct sound out of my system would suggest this product for anyone that is looking to add an amp and sub to their factory stereo

By randy on October 18, 2017 Verified purchase

Nvx Line out converter

I had the Pac lp7 4 installed in my stock car stereo, wich worked great for connecting a Rockford mono amp for subwoofer and a 4 channel amp for speakers, only problem is I was having alternator noise even tho I installed everything correctly, I tried everything and nothing took the noise out, until I read some reviews here wich said this didn't had noise, so I installed this and to my surprise only one channel ( one pair of rca) worked. Instruction said if that happened, then use the ground supplied, but that didn't worked, I checked the rca with a multimeter and there was no voltage,, then I squeezed the cables and there was some voltage, but too low compared to the pac lp7, so this didn't worked out of the package, I put the pac lp7 4 back, at least I have sound with that one, problem is I can't ship it back, cause I'm at another country. I wasted 20 bucks with shipping for this Useless converter.

By Morris on March 18, 2016 Verified purchase

Great value!!!

its got that boom for ur truck. And just a little adjustment, can tone it down very easily. I very happy and I don't get any distortion at all. A+ in my book...

Works

Was easy to install and did the trick and good price

By Cheng on April 5, 2020 Verified purchase

Works that’s all I care about!

Works Like I wanted too so yea I recommend it

By Ismael on August 17, 2020 Verified purchase

Great value

Exactly what I need for my 4 channel amp will b installed this weekend.

By Noe on April 28, 2020 Verified purchase

Love it

Better than I expected.Plane to buy a two channel for my subs.

Nice

Outstanding item I used it before and that is why I order more.

Great product

It’s really remove car noise in the wire,good product

By Anonymous on May 6, 2019 Verified purchase

Great value

I would recommend this to anyone who's looking to do it yourself subwoofer

Met Expectations

This item came as described. It was easy to hook up and met all my expectations!

By Anonymous on August 26, 2019 Verified purchase

great product

NVX XFLOC4
works great, sounds great, easy to install and small enough to hide behind factory head unit

Very good value

Everything I needed was included in this kit to install my Amp.

Good sound but defective unit

Sound quality was good, no distortion, however I had a intermittent short to the left rear speaker. All connections good, so tried to adjust the RCA output pot screws and the LR fell out. (no i didn't over-turn).
Also, the trigger wiring did not work. The LED trigger indicator worked, but amp didnt power on. So I had to run a 12v wire from radio ignition wire to the amp remote. I think got a junk unit.
Called and spoke to Randy at SonicElectronix customer service, he's sending a replacement unit. Will give more feedback after second LOC installed.

By Dave on July 1, 2016 Verified purchase

Great LOC, great price

This turned out to be a great purchase. Sound quality is great and each line level is adjustable to help tune your system. I am impressed with the quality and will be purchasing more NVX products in the future.

By Steven on July 26, 2020 Verified purchase

The connection

Very well made nice package wow come with mostly everything you need great value for wires and amp

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

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

Good for small cheap builds

Not a top tier brand but gets the job done for my garage builds. I don't trust it for major builds but not bad of a product

By Jay on March 29, 2024 Verified purchase

Sonic Electronix delivery was super-fast. The Amp Wiring Kit looks absolutely amazing. Everything you need to install and hook up your sound system. Can't wait to get the install complete. Thanks SE!!!

By Bruce on June 23, 2025 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 little amp

Easy to hook up and use. Not many bells and whistles to worry about adjusting just a clean sounding power boost.

By Chris on June 1, 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

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

Everything I needed!!!

This kit had everything I needed to hook up for channel amp.

By Rob on April 26, 2025 Verified purchase

Nice kit

Nice kit for the money. Very easy material to work with and came with everything needed.

By Adrian on March 29, 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

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 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

Great product

Used for installation of kicker amp to head unit. Works great

By Scott on December 24, 2025 Verified purchase