Customer Ratings & Reviews

Great for the Price

Thick 4700 strand. Not as thick as Knu but it is so much cheaper and it is well worth the money. Great product. Heat shrink is a little dinky and lugs have small holes so it wasn't easy to find grounds.

Good Quality

Helps upgrade your stock cables to run your system better

Does what it should!

I purchased this big3 because I needed to upgrade to 1/0 alt wiring for the 320amp DC alt coming in. Kit has everything you need besides a fuse and block, nice flexible high quality ofc wiring and sturdy terminals. Even on the stock alt just adding this wiring increased my output and really helped stabilize my voltage. Something that just about any audio system can benefit from.

Love it

I ran this kit in a 2009 Aveo5 lt and it was very easy to work with and had plenty of wire to use. It made a major difference in the electrical system. I am running 2 Dc audio 12 inch level 4's and a hifonics 2400.1 d class amp and a hifonics 640.4 and not headlight dimming since I put this in the car.

Awesome kit

This kit has the same amazing high strand silver tinned copper that NVX uses in their amp kits. It is super flexible and easy to work with. The ring terminals that are included i noticed are made of copper with some kind of chrome coating, and they are very good quality. You will need some sort of crimping tool though. The only thing I didnt like is they suggest that you put a fuze within 12 feet of your battery on the battery wire but there isnt one included with this kit but otherwise it is awesome.

Great !!!

Good quality I will recommend this nvx product to anybody for the 3 upgrade

Great kit

This big three kit is awsome. I like how only one end of each wire has a terminal crimed on and not on both ends. Having the extra terminals to crimp on your own allows for a custom cut and crimp. I install car audio as a hobby for many of my friends and family. As well as their friends and relatives. I have used many kits, or custom made my own. This kit is extremely convenient and easy to use. It allows for custom cut and no need to purchase anything extra. Everything you could possibly need for a big three upgrade is in this kit. The wires are extremely flexible and will turn into tight corners. I like to hide as much wire as possible as I like a clean look. These wires were more than what I hoped and was looking for. I will most definitely be looking for spools of this wire for future audio installs.

OK

its a nice true gauge ofc product that in my opinion is worth the price

Big 3 done

Great wires, easy to install and gauge to spec, fits 0 gauge fittings perfectly. I also bought the NVX battery terminal connectors. Very happy with the quality of their products. Ended up with about 4FT extra wire.

big 3 kit

this is a great kit. I bought off ebay a 8 ton crimper to crimp the lugs that needed to be crimped after you get them to length. This kit fit perfectly over my new mechman alternator lug. The big 3 kit now gives me all the power I need. The wires were plently long enuff and install was so easy. Buy it...it just works.

Good Wire, But That's It

Awesome, true to spec wire, fairly flexible being that it's such a big wire. The kit came with everything I needed to do the big 3. Now for the bad part. The upgrade did absolutely nothing for my charging system, the only thing I done was managed to blow money on something that I didn't need, made no difference. It's all a sales gimmick, the only way I think it will make a difference is if your running a really h/o alternator in which you would be required to run larger gauge wire or melt the smaller gauge factory wiring, catch stuff on fire etc, but for a stock alternator? Your just wasting your money. But I can't give this product a low star review, it's wiring. The wire is great, just the purpose of the wiring is a waste of time & money for stock alternators. Bad purchase for my app, or any similar app running stock alternators, don't recommend big 3's for it, just trust me and don't make the mistake I did..

NVX Big 3

Got this product very quickly, for what you pay for its very good 1/0 OFC wiring and came with all necessary things for installation. I would recommend this product if your on a budget looking to improve your electrical.

Great Quality Wires For A Great Price

These wires work good with allowing a lot of juice to flow I got these wires when I ordered a 300 amp alternator cuz I added aa lot to my car audio, I gt 2 12 inch kicker comp vrs in a ported box with a 1000 watt ma audio mono amp plus 2 15 inch kickersolo baric L7s in a ported box with a 5000 watt planet audio mono amp which i bought that amp from this site as well
Its all great

Money well spent

I ended up upgrading my cap from a cheap 4 Farad to the Stinger. Huge improvement. Surprisingly my negative review of the old cap is gone...

Pros:
- Nice size for 5 Farads
- I love the remote line to turn the cap on and off
- Solid metal box
Cons:
- Really cheap plastic feet to attach to car. For the price I would have expected something a little nicer and sturdier. I was also short two screws to attach the feet to the cap. Stinger support is great and sent out replacements.

All in all, I think it was well worth the extra cost.

Great Quality Wires For A Great Price

These wires work good with allowing a lot of juice to flow I got these wires when I ordered a 300 amp alternator cuz I added aa lot to my car audio, I gt 2 12 inch kicker comp vrs in a ported box with a 1000 watt ma audio mono amp plus 2 15 inch kickersolo baric L7s in a ported box with a 5000 watt planet audio mono amp which i bought that amp from this site as well
Its all great

good product

This item is good because you can get it all in one order. Its more expensive than ordering by the foot, the ordering terminals separate and all that. So it adds a bit of convenience. The cables are high quality. The terminal are also very good. Make sure you scrape, sand, or grind off the chrome finish . Its copper underneath.

Only thing that would make this kit better is if included a fuse holder and a fuse (like the competitor products) . The reason I chose this kit over the ones that include the fuse and holder, is this is OFC cabling. If your going to buy 0 gauge, no point buying crappy CCA.

Overall good value, would definitely buy it again in the future.

Sick

the best thing I have bought so far come with a hold down bracket and the wires to install it easy just recommended an isolator

Great Product

I am a bass freak when it comes music. And I used a battery capacitor for my 2 12"ice kicker compr with a 2000w amp and a 500w amp plus a epicenter and ect and my lights was deming. I seen this product and the watts for this battery was alot and my lights no longer dim and it beats hard without losing power at all!!!!! Recommend product for a great system.

small but powerful

I would definitely recommend it if you have a small beginner system in your car taxes power has always been the best even though it is a little pricey you don't get what you pay for

Great Product

Im running two Rockford Fosgate amps in my truck and don't have enough room for an extra battery so I figured i'd try a capacitor as my lights were dimming a bit at high volumes. The Stinger 5 farad cap not only fits in a small spaces, but performs very well. My lights don't dim at all now and I can listen to my jams at high volumes even at night. Great product and a great price! NOTE: I am running a Rockford Fosgate T500.1dbcp and a T600.4 and the result was great. Im not saying that this product works miracles, but seems to do well with my setup. I'm also using an optima deep cycle battery as the main battery in the truck.

good easy kit to use

Comes with everything you need to install. Very easy to do bend.

Awesome kit

The wire in this kit is top notch! The lugs and heat shrink made the install look professional. Wire also bends around corners very easily, I had read this in the reviews but I was surprised how easily it bends. Very happy with this kit. Five stars! Sonic was awesome as always

Great Quality Wires For A Great Price

These wires work good with allowing a lot of juice to flow I got these wires when I ordered a 300 amp alternator cuz I added aa lot to my car audio, I gt 2 12 inch kicker comp vrs in a ported box with a 1000 watt ma audio mono amp plus 2 15 inch kickersolo baric L7s in a ported box with a 5000 watt planet audio mono amp which i bought that amp from this site as well
Its all great

nice oackage

Wire look nice comes in a good looking package all together

good price

good price and works good had no problems with it since the install.

heavy duty

These are heavy wires the casing is packed I love them I want and need to get the amp wiring kit nvx and get rid of my old wires

Great service and best prices online

I just want to let everyone who is serious about their car audio this is the best place to shop. They go out of their way to get you what you want and they have awesome customer service and installers that actually know how to make you feel good about your purchase and appreciate your business. I've never one time bought something and had buyers regret. Five star service all the way!

NVX 0 gauge

This product was amazing. It was think wiring along with it being OFC. The only thin is you will need a soldering kit for the terminals because you would not be able to crimp them.

xs power xp750-ck

Great product, price, and service.
I recommend for anyone wanting car audio


Thank you

Fantastic value!

The quality of this cable is superb, it appears to be identical to the Kicker 1/0 hyperflex I ran front to back 5 years ago. It's REAL copper wire which is almost hard to believe considering the price of the kit vs how copper has skyrocketed in price over recent years. Of the 5 or 6 brands of 1/0 I have in my car and numerous others I've installed, NVX is now very near the top of my list.

The lugs included are also of very high quality. My only complaint is the holes were a few sizes too small for my application for everything but the alternator output post which was a tad too large. Nothing a vice and sharp drill bits couldn't fix though.

I spent hours shopping around for the best big 3 upgrade kit in terms of value, I firmly believe that this is it.

By Matt on May 1, 2015 Verified purchase

Best cap on the market, from the best supplier period!

Picked this up instead of a battery as I did not want a battery behind my seat in my Sonoma. I have done every electrical upgrade, Big3, Largest GM alternator on the planet, 0 gauge through out. No corners were cut there, and I still had my lights dim and my voltage drop! I knew I needed more power and this 5 farad monster gave me just what I needed. I will be running an xs power d3400 as my underhood battery. With the stinger spc505 on the xs power d3400 my voltage issues are a thing of the past. This hybrid cap is exactly what you need so stop wasting your time on lesser products, save you cash and make this bad boy a forever home in your mobile audio set up! Sonic Electronix is my #1 stop for everything thing car audio period and they are the best supplier in the world!!! Love my new product, and I love the peace of mind shopping with you guys, SE you rock!!!

By T&J on June 10, 2015 Verified purchase

AWESOME KIT!!

Quality is top notch, I was so impressed with this kit that I bought the 0 Gauge Amp kit...

By Shannon on July 1, 2015 Verified purchase

Very High Quality Big 3 Kit

I don't think I can put the quality of this kit into words. NVX has done it again. I have yet to be disappointed in a single product from them. The tinned copper cables have a very high strand count. The copper in these cables is every bit of 1/0 ga. I would say it's actually a little larger than true 1/0. The jacket on the NVX cables is beautiful. It is just the right thickness to offer great protection and remain highly flexible. The terminals provided with this kit are the biggest I have ever seen. They are very thick. You will either need one heck of a crimper or be prepared to solder as I did. The lugs and jacket hold up very nice to the heat from the torch while soldering. My electrical system in my NNBS GMC Sierra Crew Cab is performing extremely well after big 3 upgrade with this kit. I'm running 2 amplifiers and my voltmeter doesn't budge at full tilt. Only time it drops is due to the GM voltage regulator on the newer trucks that supposedly helps the mpg. I can even hold down all 4 window buttons with stereo and A/C on and the voltmeter stays on same reading. Awesome. I've used plenty of other brands of cable and none of them come close to NVX. You will not regret buying this kit.

By DAVID on June 6, 2015 Verified purchase

I used everything in the kit

Really great kit. The wires are very flexible. Also, the ring terminals are super heavy duty and perfect for soldering.

By Joshua on May 26, 2015 Verified purchase

worth it

After getting this battery installed my amp doesnt cut off any more and headlights barry (if at all) blink. Very good product.

Good Buy

Good product. Exactly how described and worked for what we needed it for.

By Cody on June 19, 2015 Verified purchase

Thick

Nice thick cables. Haven't installed it yet. Waiting until I drop my engine.

Great product

the Singer SPC 505 is a great buy for those on a budget and it works great!!

Great value

Sounds very clear great product I have ran pioneer n a few of my systems very happy with them

Great quality

Great product , super flexible and had more than enough material to correctly install.

Well made product and Design

I would recommend for anyone running 1 battery 1 amp 3000 Watts or less

By Jason on November 11, 2017 Verified purchase

Lmao @ everybody

Man. Get some xenon headlights already youll. God damn. And some leds in the rear while youre at it. Boom no more headlight dimming. What a bunch of clowns. I did buy one of these to boost my voltage up to 16. Seeing as how it has a dial to set it with. Now theres some power. 3000w rms @ 14.4 or 3500w at 16v. So basically smoothing out the power supply and getting an extra 500w rms to my sub. Good thing it can take 4k all day.

By charles on June 27, 2016 Verified purchase

Stinger SPC505

The ratings , and reviews say it's a very good Cap , I've had it for a week ..so far no complaints or issues ,( I have a 2100 watt system , High out put t alternator , big 3 wiring kit , and a 1800 amp Kinetik battery )

Nice big 3

Nice product but Sonic customer service is a bit to be desired. Everything I've tried to order has a problem so buy the big 3 straight from nvx and save yourself the headache not messing with these people.

OmG amazing!!!

This is oxygen free 100% pure virgin copper (OFC) that has been dipped in silver. I was using a diffrent cables that was OFC but it was also (CCA) Aluminum wire dipped in copper.

The difference in volts that I gained was 40% higher! So it is most certainly more efficient. Thank you NVX & thank you sonic electronix!!!!

Great product

I most definitely recommend this battery if u got system in the back of your car this help your system feed more power !!!!!

By Dee on February 18, 2018 Verified purchase

Spc505

Awesome capacitor works great love the voltage adjustment makes refining things easy very small in size big in capacity true 5 farad only the best from stinger.

By Ian on September 27, 2021 Verified purchase

Best quality wire

This wire IMHO is better than knu and sky high and cheaper. Very flexible and slightly bigger spec.

You can not go wrong, and this kit gives you 14 feet total as opposed to every other company giving 12 feet.

Awesome kit

Would deff. Recommend this product. Got more than enough wire to do the big three update. Still have low voltage at idle but its mainly due to H/O alt.

By Keng on April 4, 2018 Verified purchase

NVX Big 3 Kit 100% OFC copper Hyper flex

PROS

Product is amazing Thick and very flexible great product easy to work with and comes with everything for a clean install

CONS

DOSE NOT COME WITH A FUSE HOLDER AND ANL FUSE SO GET YOURSELF A 300 AMP ANL FUSE AND FUSE HOLDER

Extremely high quality cable!

100% OFC cable was very flexible and easy to work with, and included good quality ring terminals allowing easy soldering.

By Andrew on March 4, 2016 Verified purchase

Great buy

Product came fast and was top notch.. I'll def recommend this to anyone looking to optimize there electrical system

Big wires

When it comes to do the big 3 this its the best kit you would find for the buck. I did a lot shoping around to find the best quality and price and it leads me to this nvx... Once I got it deliver and I check it out it totally impressed me on quality and flexibility... This its a top quality wiring brand at least I think so, for what I experience.. I like it so much that I also order a power and ground wires from nvx for my entire system ( jlhd 1200, jl 400/4, rf cap.hd10fard)
As far as imprubment it did, louder and clearer bass, louder mids and highs, the only think it didn't help much on dimming lights, it help some but I can still notece some dimming when playing it super loud... But as fur as big 3 upgrades this its the kit to get....

Awesome kit, would recommend to anyone wanting to do the Big 3!

First thing, I was recommended to buy this product, and I truly thank the person who recommended it! I was debating whether or not to get the OFC or CCA, and OFC was definitely worth the extra buck! The kit was easy to install, and with only a few tools from home. Couldn't have asked for anthing better!

By xGETxPOWNEDx on June 20, 2017 Verified purchase

The best!!!

This big 3 kit is hands down the best NVX wiring is the best I have worked with!! Very flexible and easy to work with!! All the connectors were easy to use and get more power and it eliminated the headlight dimming I was having!! Great product with an awesome price tag NVX is a great brand with awesome quality!!

By daniel on February 24, 2017 Verified purchase

Great product. Love the brand nvx

Big three was a great upgrade. Worked perfect plenty of cable and ends. One of the best big 3 upgrade

By Clayton on January 14, 2016 Verified purchase

Awesome Product!

This is a well put together kit that comes with everything you need for the Big 3 upgrade. High quality materials make for a clean install. I would highly recommend this kit to anyone looking to complete this upgrade.

By Anonymous on November 29, 2018 Verified purchase

Excellent quality

Product did what it was intentionally designed for and help out my electrical system a lot!

By Anonymous on November 3, 2018 Verified purchase

Big 3 Kit Is Awesome.!

Love this product, great wire, they send more then enough wire for the job.. No short cut’s anywhere.. highly recommend this to anyone installing a system no mater what size. Completely stop my voltage drops and light dimming. Thanks NVX.
Will be buying another one for future projects.

Awesome package deal!!!

This kit is amazing, it gives u everything u need all in 1 package so u can save money buying it all separate. If I'd had to buy all the pieces individually I'd have easily spent double!!!! Not to mention the quality of NVX wire it easily competes with fosgate, kicker, and Jl audio wire, it's just as good and the same amount of strands plus it's silver tinned to stop corrosion and for half the price!!! U can trust this company on any of their products and won't be disappointed!!!

By James on October 5, 2017 Verified purchase

Works great on tundras

I was asking a lot from my stock alternator and batter playing 2100 watts rms. I read about doing the big 3 ad was hoping it would help. My idling current was 13.6 volts from the factory. After the big 3 I was seeing consistent 14-14.2 idling voltage on my digital distribution block. Highly recommend the big 3 upgrade to squeeze all you can from the factory set up.

Nvx 1/0 power wires were great quality, very flexible. I liked them so much I upgradedy 4ga supply wire for my amps to 1/0. Great products at decent prices

By Travis on November 25, 2016 Verified purchase

Must have

This is a necessary upgrade for anyone interested in real power. I love the quality of the insulation and the flexibility to run anywhere. Had all the goodies included. Could have an anl fuse block for extra protection, but no biggie.

By Brian on August 2, 2020 Verified purchase

Night and day difference

Extra battery? Cap? NO!! BIG 3 all the way!! This is the best upgrade for a serious system. Quality product.

By cj on January 21, 2020 Verified purchase

Great Kit

I really like the NVX wire. Its flexible but not because it is lacking wire. I find that most flexible wire is lacking just that. Wire!!! You want the most amount of wire strands in order to carry the current. The jacket feels very well made and I like all the terminals and heat shrink you get along with the kit. Its overall a great value. Very happy with this purchase.

By Anonymous on September 8, 2018 Verified purchase

NVX XBG3PK Big 3 Kit with True 0 Gauge 100% Oxygen-Free Copper

I would most def recommend this big 3 upgrade for the simple fact its a great price great company behind it and it works. Great quality of the wires very thick and true to size. I had enough wire in this package to actually make a big 4, by grounding my alternator. my only complaint is that the shrink wrap is not the best but I can live with it. .

By Anonymous on June 26, 2018 Verified purchase

NVX XBG3PK Big 3 Kit with True 0 Gauge 100% Oxygen-Free Copper

Awesome product will no buy for every car i got.. love the performance from this kit.

Perfect purchase!

Cheaper than any other brand I could find, cheaper than some CCA 0 Gauge kits I've seen out there as well. would recommend

By briz on April 19, 2018 Verified purchase

Great Value!

Good wire with great hardware! Definitely will be buying this kit again with my next build!

Works Great

Installed this on my 2017 Honda Accord. Voltage never drops below 13 volts with 3500 watts rms.

Great service and quality products !!!!!!!

Quality of product is as it was discribed. Also shipping was fast!!

Happy customer

This Big 3 setup kit is better than what I was hoping for. Its really is TRUE 100% OFC 1/0 AWG, that is very strong and flexible. I installed this on my 95 GMC Suburban K2500 and took me no more than 25 minutes (ripout and installation) to complete. Even had about 3 feet left over from the power wire and close to 2 feet left from the ground wire.

Tim

Its the Big3 at its best, high flex 100% OFC true spec. If you need power then you need this upgrade.

great product

has the quality and good pricing, upgrade from stock charging system.

By Gregory on February 17, 2020 Verified purchase

Great Wire

I originally ordered the mechman big 3 upgrade to match the mechman high output alternator that I installed. But the mechman wires were crap! The 0 guage was so loose in the housing that you could pull strands out from the ends. Complete garbage. I ordered the nvx to replace and the quality was so much better.

By Craig on February 16, 2020 Verified purchase

True 1/0 Gauge

I was happy to see that this product out shined the other options in the same category by having true 1/0 Gauge OFC Copper. Plenty of length for the runs, and made a run from opposite ends of the vehicle bay in my car from alternator to battery. Won't be a problem of too little wire for 99.9% of cars.

High Quality parts

The Quality of these wires was very high and had everything needed to install this straight into my car. Unfortunately, on my car the alternator is on the opposite end of the engine bay from my battery, so only one groud wire was long enough, but it was easily fixed by buying a second five-foot ground cable. Overall, a great product

By Anonymous on August 31, 2019 Verified purchase

Great Price and High Quality Kit

This kit was a great value and well worth the price. The wires are true 0 gauge as indicated in the description and I would definitely buy this product again. It came will way more than enough wires and parts for the big 3 upgrade!

By Uriah on May 14, 2017 Verified purchase

better than perfect.

This big 3 kit is amazing. Just like the 0 gauge kits. The wore is amazing and very easy to use.

Good value but not fully ready to install.

Good price for the material but it doesn’t come fit for my car and it doesn’t come fully ready to install which sucks because now I have to buy the tools just to prepare the wires so that I can install them. If I knew this beforehand I would have never bought it.

Great upgrade

If ur looking to upgrade ur electrical system this is the kit u need

By eusebio on August 15, 2020 Verified purchase

JUST GET IT!

True 0 gauge copper!! What more can you want!! You need this now and you won't be disappointed! Really great colors too!

By Andy on February 24, 2018 Verified purchase

Great product

Wires size is true to its size, works great no issues.

By Noah on May 2, 2020 Verified purchase

NVX XBG3PK Big 3 Kit with True 0 Gauge 100% Oxygen-Free Copper

come with every thing you need to do the big 3 upgrade and with quality wire

Awesome product

Came with more than I thought, had the wire, splitters, and fuse block I expected, but also came with different fuses for different amps. Definitely will buy again

Worth every penny!

I was really pleased with this kit. Not only does it provide you with plenty of wire to work with, but to get all the extras in the kit for this price is hard to beat. It would be almost impossible to build your own kit with comparable products for the same price!

Good product!

Great buy for this item. Helped with my system and I'll be buying another set soon for another car!

By Meach on April 18, 2017 Verified purchase

It's wire

Sonicelectronix offered me $5 off my next purchase if I reviewed my last purchase.. so here it is.
It's okay wire. Definitely not the best 0 gauge I've ever had, but certainly better than that copper clad aluminum garbage.

By Willis on April 26, 2022 Verified purchase

Excellent quality

The kit came with all the needed hardware. Needed to grind down the connectors to fit my battery terminals. Other than that more than enough wire.

Good

This did help out with my issue, and it's a good buy, because all I had to do was connect it since the ring terminals are already on the wire ready to go. My battery post just uses a allen set screw for the bare wire end.

By Curt on April 5, 2016 Verified purchase

great purchase

The product is fantastic. The power wires and fuses made a ln amazing difference to my sound system the battery could have been a little stronger but that was my fault. The only thing I had trouble with was on the battery itself its terminals were too small to use the o ring crimps provided on the power and ground cords. They would stop right through the terminal or not have a good connection so I modifyed it.

NICE VERY NINE

Very good stiffing capacitor. Has that little extra power needed for good base. Easy to install

By Carlos on April 8, 2022 Verified purchase

Awesome setup

Put this in my bayliner 175 as a backup battery and for my stereo system, do to limited room I could not put in a full size battery, this works great and has everything you need to install it except a switch or isolator.

Great

No problems, Works as described. Good company fast shipping.
Would recommend

Great product

I really recommend this full box!!
It really help the sounds system in my 05 crown victoria police package

By Arnulfo on April 3, 2017 Verified purchase

Amazing Battery!

This battery will definitely do the job in keeping the amp fed while stopping my lights from dimming. In fact my Sundown Audio subs sound louder and clearer. It's almost too much to handle! Everything comes int he kit you need to wire it into the car itself. If your having power issues, definitely get this battery instead of a cap! Cap will just be a waste of money compared to what this battery will do for your system.

Not too big Not too small Just right

Okay so after doing all kinds of research on my capacitor I found the consensus to be that batteries for car audio are far better equipped to keep my alternator and battery stress levels in check. So I built my box and mounted my amps then came the battery. Well for where I wanted to put the battery the wiring was about 5 feet short. So I had to get the battery closer to the amps. So the plan became put the battery in between the amps mounted on the back of the box.

Okay so important fact about the product here. The bracket that came with this kit was a life saver. I was able to mount the battery sideways to squeeze it in between the amps. Perfect fit.

The bracket looks great and is a perfect fit for the battery. It has the company logo on it and it looks and feels nice.

The wiring kit was also great. The ground and power wires were more than enough length again unless I wanted to mount the battery way back from the amps. If you are mounting the battery 4 or 5 feet from the amp you may want to get a section of wiring to run back to the amps. And of course you will need another ground for the battery which you may be able to get from the existing ground wire.

The quality of the wires all around was very good. The thin copper wires are tightly bound and there are a lot of them. Be careful when you cut the wire because tiny strands go everywhere and aren't fun vacuuming out of the carpet.

Fuse holders were very nice and look great. No complaints or concerns there. They are big but that's no big deal for me. If you have space constraints under the hood you may want to check out the dimensions.

The battery seems nice but how do you really know. I can tell you that I don't have dimming lights at high volume. The terminals on top are very small. So much so I was initially worried about the problem. But after mounting all the wires and seeing how well they made contact it was good enough for me. If you want to see every piece of metal on the end of the wire touching the battery terminal you will want to look at the terminal extension / adapters. I personally think they make plenty of contact but you may not feel the same. For the power restrictions this unit has I don't see how it could matter much.

So overall this is a great kit. The price was more than I wanted to spend but I think the value is good.

Buy It... Don't B.S.

This came with a package deal. I have the Hifonics Brutus 2000 watts (she's a beast for her wattage) and she will pull power but this battery I have not missed a beat. No blinking, no missing lows, no uneven songs when played at Max volume and amp all the way up. Glad I got it.. better then a cap...

By Juan on August 3, 2017 Verified purchase

Awesome bundle!

This is a very economical way to add a second battery for a 1000 watt sub amp. Please note that the 4 gauge is not OFC but CCA so it's not a good option for 1500 real watts or more. For the price and quality it can't be beat.

Improvement

Noticeable difference in entire car lighting, and response. Very easy to install. Im not gonna lie I dont like the fuse holders. I recommend NVX 150amp fuse holders.

By Eloy on June 6, 2017 Verified purchase

Xs Power xp750-ck

Great product fast shipping actually ordered a second one about a week later.

Xp750 kit

This little battery dude the job for my system. I have a ampere 2000.1 and two sundown 15's. This set up slaps pretty hard and with a big 3 upgrade my voltage is 14v all day in my Tahoe with a stock alternator. Now a days little doesn't mean anything.

great deal

I would recommend this to anyone needing an extra battery kit the mounting bracket fit perfect in the place where my stock cd changer should have been , I'm not so much of a fan of the cca wire but that's just me i think the other parts more than make up for that . i have been running this for a year or so with no real problems

btw i have agm under the hood powering a fosgate p1000 bd and t 400 on mids and highs just under 2000 rms

Xs battery

Great seller n fast shipping will buy again n again.

Decent Little Battery

This battery is perfect for smaller setups. The blue cable matched my Hifonics amp well too.

By Scott on May 19, 2017 Verified purchase

Good value

Much needed for a small system power upgrades. Great packaging & everything you'd need for a secondary battery expect a RELAY

By Chad on September 15, 2017 Verified purchase

Great set of wires.

These are top notch cables. Oxygen-free is the top of the line for car audio applications. They have an amazing selection of top of the line wires.

By Christopher on March 12, 2026 Verified purchase

Great wiring set

This wiring set does an excellent job of powering amps that are located at the very back of the car. Large gauge wireds and looks to be well made.

By David on August 28, 2025 Verified purchase

Great quality

This big 3 kit was perfect for my truck as I had plenty of wire length to upgrade my power and grounds plus some left over for my stereo install! I appreciate the 100% oxygen free copper wiring and the 0 gauge was easy enough to bend around as needed. I also liked the clips included for the big gauge wiring.

By Shawn on March 9, 2025 Verified purchase

amazing for your amps.

I have a continuous voltage @my amp for my subs.
This capacitor has really energized my sound quality!!!!!!

By Craig on January 30, 2025 Verified purchase

Excellent quality on this Big 3 kit, nvx a good brand ????

By Gerardo on August 8, 2024 Verified purchase

Nvx big 3 upgrade

Installed the big 3 upgrade on a 2012 f150 and it made a major difference in voltage wires are long enough to cut to length you need and have some left over I personally put a 250 amp circuit breaker in between my battery and alternator wire just for piece of mind you don’t have to do this I just chose to do it on my truck. But I definitely recommend the big 3 upgrade from NVX especially if your running high output amps and and other accessories it’s a must have

By Wesley on June 27, 2024 Verified purchase