Customer Ratings & Reviews

WOW!!!

Just installed these and holy cow... what a difference. Had jl c5-650 and these rockford fosgate speakers blow them out of the water. Even better they were half the price of jl you cant go wrong! Buy them!!!

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.

Best Speakers Ever

Holy cow beautifull and loud highs. Lows, mids all in perfect harmony and surprisingly you can FEEL a decent amount of bass coming from this mid woofer. Very impressive, crank it up and is still crystal clear. Only downside i can see from these is finding a spot for the massive crossover that comes with them. If your looking for some bass great mid bass/mids and highs that are SUPER loud but not harsh sounding these are where its at right here you will not be disappointed. BUY THESE!!!

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

clear from min to max

installed on a jetta mk4. Needed spacers but beyond that the install was easy. I mounted the crossovers in the trunk because they are kind of big but i knew that going in and they do there job well. clear highs and lows from min to max. If you want it loud then this is for you.

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

Amazing speakers

I immediately installed them and hooked them up to my P400-4 amp in my truck and they sound astonishing. Crystal clear at any volume. Highly recommended if you've got the room for them. Since they're 6 3/4" speakers they may not fit into 6 1/2" openings, but with them being components and the tweeters and crossovers have to be mounted separately that should be something expected when ordering.

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

Loud and Clear

I have these on a Hifonics 1000.4 amplifier. They are getting 125watts RMS each and sound amazing. Have gotten many compliments on them. People say they can hear me coming around of the block. The woofer is like a mini subwoofer. It flexes my door a little bit too. And of course its the classic Rockford quality you expect. Am very happy with them and would recommend them to anyone. Would be nice if the crossover was a bit smaller though. They don't distort. Not even at the highest volume on my deck. Get em. You won't regret it. Rockford Fosgate is the best.

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.

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

Very very good

This get loud easy, clear as a bell too! Im running these active and not using the passive crossovers.. Only drawback i noticed is the favor the 1khz range a bit too much. You can fix this by giving the tweeters more power and or eq-ing that range down a bit. but then they get a bit too bright. Having a midbass driver to pair with these would help a lot as these are not meant for midbass frequencies. Overall I'm very very happy with them. Would recommend.

By eric on January 10, 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

Amazing

These are top notch speaker. I have them amplified at 100 rms each. Good mid bass. Tweeter clarity is great

By Tyler on August 19, 2022 Verified purchase

Great Speakers!

I have stated on many other reviews how much I am a Rockford Fosgate fan and this component set makes it even easier for me to continue to make that claim. They sound great and don't give any issue despite the power I am putting on them (a RF Power T400X2ad, with 200w rms per channel),...and I crank my system for astraight hour, each way, to work!

By Trent on August 10, 2023 Verified purchase

Great Value

Amazing sound and great power handling. Everything works and functions as it should. Running 100watts RMS each with great clarity and response.

By Christopher on March 19, 2023 Verified purchase

Awesome customer service

Sonic electronix is the only online store i use.
they ship fast, keep me informed and always have what i need.
this component is awesome looks good and sounds better

By Jose on January 27, 2024 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

Amazing upgrade from coax speakers

I bought this to replace 3.5 in pioneer and 6.5 in Polk Audio coaxial speakers I have installed in my dash and front doors. Even using an amp the coax speakers just didn't sound good. I installed the Rockford Fosgate speakers in the front doors and replace the 3.5 in speakers in the dash with the tweeters. I used speaker baffles when installing the 6.75 in my door.
I can't emphasize enough how big of a difference this component set has made. Even though I have a subwoofer in the trunk, everything sounded thin when I had the coax speakers installed. Immediately after installing this component set my sound is no longer thin. The front soundstage is amazing. Honestly just buy these, especially if you can get them open box like I did. You will not be disappointed. Just make sure you power them with an amplifier with enough voltage and not just head unit power. I can imagine these wouldn't sound to that good underpowered. I'm pushing 100 watt RMS to each component pair and it's perfect.

By Paul on February 6, 2026 Verified purchase