Customer Ratings & Reviews

Great deal

Got this product free with the purchase of a pair of speakers it helps out a lot looks more professional and sounds cleaner definitely give it a try for your next project.

Don't go without it

This really helps with overall sound quality, especially mid-bass in my experience. NVX offers excellent quality at better prices are than other popular sound deadening brands.

By Anonymous on September 9, 2019 Verified purchase

Very Thick Dynamat

This product is very thick compared to cheap versions. Priced excellent. If you want to reduce any vibration or road sound, choose this!

By Adrian on June 21, 2020 Verified purchase

Very pleased

I am glad I went with this brand. Easy application and works great in keeping my Corolla quiet and audio clean.

NVX SDBSK2 Premium Stealth Black

Thick and heavy. I was suprised with the actual quality. For the price they’re great quality

Good product

Sticky and did hook well to the cars body . Got it for free with my speakers purchase. Sonic electronix for life

Impressed! But Not At First Listen! Loud doesn't equal qualtiy!

NVX is a relative new comer. I did a lot of research prior to selecting these speakers. I also purchased the NVX N series 6x9. The rears are 55wt each rms with a frequency range of 70hz. The fronts 6.5 are 50wt each rms with a frequency range of 58hz. An important factor with a 4ohm speaker with a sensitivity level of 89db. I wanted this change because I thought the lower frequency range speakers I had in this Cobalt were a little to base heavy which overwhelmed the front at 48hz. Acoustically for this type vehicle was a little much imo. The speakers kicked pretty hard even at 2db on the low. I attributed this to the car being a compact, and not as heavy as road car like the Impala, or Malibu. This car has HU with a parametric EQ, and an Alpine 445U power pack with 45wt per channel. With this I can deliver 95% power to the fronts, and 90% to the rear. The sensitivity levels on both the front and rear are in equilibrium at 89db, This balances the fade.
The sets that were removed in the rear were 87db with the fronts rated at 92db. At first I thought I wasn't going to like the speakers, and perhaps I had made a mistake with the change, but I was tired the first evening, and the change I thought was pretty dramatic that speakers were to bright, and maybe to quiet to what I had become accustomed to, but not the second. These speakers are not to bright, and aren't as quiet as I first thought. The reverberations in the car were gone, the boomy sounds had dissipated, and what I was left with were very crisps clean sounds without doing to much to the EQ, A little adjustment here, and there, and I could hear the faintest of sounds. Again I would like to point out that this HU has a parametric EQ which allows for adjustments from -2 narrow to +2 wide ranges for the low, mid, and high. I was happy to discover that I could adjust the low to a -1 narrow imo sounds cleaner. It didn't work with the prior speakers, and produce a good clean sound. We don't like our hears to hurt, and to enjoy music in a normal listening range the Loud button on high did the trick, it added the depth I wanted to hear. There is no subwoofer which I prefer. Playing music loud with all the thumping for me can be annoying, and to loud will cause the ear drum to distort if not the speakers Good quality speakers produce the sounds of every instrument cleanly and naturally at low volumes. These do just this. Powering up with just a small in dash amp brings out the full potential of these speakers. Trust me when you take them out of the box you will discover the quality that went in to making these speakers, in this catergory second to none. NVX has a full line of speakers and equipment for the more enthusiast, I am a avid music listener. Good music deserves decent equipment to be able to appreciate it. Hope this review helps. I even went as far as talking to Brian at NVX, and found him to be very nice and more than willing to give me his time with all my questions prior to making the purchase. I hope NVX much success. I personally am very satisfied.

NVX SDBSK2 Premium Stealth Black

For the price, I wish it came with a bit more of the material compared to other packages, but it definitely does what it's supposed to and will make a noticeable difference if you knock on the door/panel where it was placed vs where it wasn't.

By Anonymous on June 12, 2018 Verified purchase

NVX SDBSK2 Premium Stealth Black

Easy to use and reduced vibration, allowing clear sound coming from my door speakers.

Great value

I installed these on each rear door of my 2005 Silverado. Could really hear a difference in sound quality.

Needs an amplifer

These are nice speakers with good sound quality , but when I installed them in the back doors of my Astro Van to replace the factory originals they seem to lack the punch of the old speakers. Since they are designed to handle 100 watts rms they may not be effecient enough with just the output of the standard GM radio. I may have been better off using a speaker rated at a lower max watt rating.

2 Corrections On My Review

First I got the size speaker that was installed wrong, but I doubt that this makes any difference, the 6" will sound just as good. But I got the frequencies crossed. The front on the 6.5" are 70hz. The 6x9's at the N series are 53hz at 55 watts per speaker rms. The opposite would not make sense. I would also like to add that you can play the speakers loud, but at a moderate level these are loud to me. These are easy to power up. With that small amp the Alpine 445U at 45 watts per channel the volume control at 7 is pretty loud. The more I listen the better these sound. I have an HD component, and live near a large city, and the stations are strong, and clear, put in a CD and you get all you want from a set of full range speakers. If this is what you're in the market for you'll be happy with your purchase. I'm glad Sonic is offering NVX, and the reviews that were given by them are very accurate.

I personally like a parametric EQ because it allows for some additional adjustments for overall sound quality imo as the Q Factor that allows you to tweak a little more.. I've recently discovered that Sonic is selling Equalizers for those who have more elaborate systems. Anyone wanting to fine tune those for those sounds we all seem to be searching for this may be the ticket. The prices are very reasonable. If I would go to a subwoofer I would have to get a bigger amp, and an EQ would definitely be something I would want.

NVX SDBSK2 Premium Stealth Black

Great product, Sonic Electronix is great. I've ordered a few things from time to time and have had no problems. I get the item quickly. I ordered this and was so pleased. I ordered another set. Works great.

By Joshua on May 25, 2020 Verified purchase

Amazing speakers for the price

I would defiantly recommend this product, good speakers for the price

Great Sound !!

I had some time to listen to my favorite jazz fusion on my Great speakers. Surprise at what I was missing. Well Done on the production ! Thanks Donald

Good deal

Bought a pair of kickers and they came for free, doubted them at first but it really does help in muffling the rattles from the speakers.

NVX VSP60

These have a very clear sound with good mid bass response. Definitely a great door or rear deck speaker.

Awsome Sound

These speakers create a tremendous sound for the dollar. It is hard to believe the big base sound coming from these small speakers.

By Jack on April 4, 2016 Verified purchase

Sound deadening

Makes the speakers sound great and looks good to plus doesn’t blind you.

By Christian on April 22, 2020 Verified purchase

NVX SDBSK2 Premium Stealth Black

Perfect fit an very fast shipping.Good list to choose from to fit my car.

GOOD QUALITY AND EASIER ON THE HANDS!!!!

I got this small pack to finish my daughter's 2020 Camry after I had already used the foil-backed version. It went on just as easily and stopped the license plate and gas gap door rattle. A big plus for me was it didn't cut my hands shreds as the foil did.

By Gerald on July 13, 2021 Verified purchase

Good quality sound deadener.

Not enough to cover an entire door but enough to add enough mass to make a difference. Peel and stick.

By Joseph on February 2, 2020 Verified purchase

Nvx sound mat

Added 6.5 jbl gto coaxial to my front doors very easy to use clean surface and stick very easy to cut any time you door speakers add nvx mat you definitely notice the difference in the sound of your speakers it's a must best money I spent if your upgrading your speakers might as well do it right

By Big pat on June 13, 2021 Verified purchase

Does the Job

Good price, fast shipping, works good. Greatly improved bass while also making the vehicle quieter.

By NICK on December 3, 2022 Verified purchase

Best stuff on the market

For the price this is the best stuff by far out there A+++++

By serento on July 6, 2025 Verified purchase

Free Free Free

Who does that anymore? Free product great service free shipping that’s why sonic’s electronics is growing and other companies are not.

By KELLY on February 27, 2025 Verified purchase

Works great! Flexible and thick!

Works great seals up all the gaps!

By erik on December 21, 2024 Verified purchase

Nice product

Love that I got it for discount with speaker purchase. Works like a champ!

By Craig on October 18, 2025 Verified purchase

Makes sense Works perfect

I put a square behind ea. door speaker and a square on the inside of each pod and it made a solid difference, especially for the pods. The music sounds better, no hint of an echo or slight vibration that I'd get before insulating with NVX SD. Pods/speaker boxes should really come insulated from the factory. Install some squares behind your speakers and you'll hear the difference.

By Ron on June 12, 2026 Verified purchase