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

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.

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

Rockford Fosgate R14X2

I needed a set of 4" speakers for my Kia Sportage as the old ones finally gave out on the surrounds. I was looking for an efficient 2-way speaker and the Rockford's provided that in spades. They have good response across the spectrum and are easy to eq-out. While 4" speakers don't excel at bass these are definitely adequate. The polypropylene woofer with it's rubber surround will give years of service in a car door, the tweeter has a good clear sound, their power handling and efficiency are up there. They really fit the bill for my needs. I would heartily recommend Rockford Fosgate R14's for those tight automotive spaces. They are a winner.

Amazing Sound From A 4" Speaker!

I bought these for a VW Vanagon because I needed a good quality, flat fronted speaker. I didn't think that a speaker that small could fill a space that big, but these are doing the job. Installation was a straight across changeout. I couldn't be happier. I strongly recommend them.

Classic Sounds Forever!

Ordering (very professional),Shipping, Delivery,Quality...EXCELLENT! If it's not broke, how can you fix it any better? Thanks for a GREAT shopping experience!

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.

Great Speskers

Great speakers for the price. Sounds great at a reasonable price

Excellent Product and great value

I highly recommend these speakers. They were a major upgrade to the base level speakers that I removed from my 2017 BMW X1. The sound is much richer and complete now. These speakers are made of high-quality materials.

By Philip on April 28, 2020 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

Great Buy

Shocked at the price!! These little Fosgate deliver crisp and clear sound!! It definitely would but again.

By Kevin on May 6, 2020 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

good speaker

good quality speaker for the cost easy directions for install

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

Rockford Fosgate R14X2

This product does what I ask it to do. Play my music, does it well. I got them to replace the factory speakers.

Work great!

If you have a stereo that pumps out less than 50-60 max per channel, which is pretty much all of them, then buy these speakers. You don't need or want a higher wattage speaker with a stock deck, only when amplified or stock power is over the rated watts for the speaker. These speakers sound beautiful and clear on my brand new Pioneer x7800(50w max x 4, 7 rms)at volume level 52 and even to Max at 61 for some songs. Good response as well. Not sure if a con or not for the speakers, but mounting holes were closer together then on my vehicle which had same size class speaker(4") by an eighth inch.

Great quality

I purchased these speakers as replacements for my 2000 BMW Z3. Process was simple, the price is great, and the quality is amazing.

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

SATISFIED INDEED

I BOUGHT THE FOSGATES FOR MY 323I BMW AND I LOVE THEM. EASY TO PLACE ORDER, DELIVERED ON TIME AND PROPERLY PACKED COULDNT ASK FOR ANYTHING BETTER! ...;0

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

Love These

Great speakers. They are crystal clear even when cranked.

By Benjamin on December 28, 2025 Verified purchase