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ResoNix GUS Series
Shallow Subwoofers

Ultra low distortion. Zero compromises.
The best sound quality on the market.

Preorder now
ResoNix GUS Shallow Subwoofers lined up left to right in 15", 12", and 10" sizes respectively
Free US shipping over $99

Most orders ship within 24 hours

Made in the USA

Ensuring the best quality

Highest quality materials

Engineered for every vehicle

Easy installation

Soundproof your ride with ease

Learn, research, & buy

All things sound deadening explained and broken down.

Not only does ResoNix offer the very best automotive sound treatment and car audio products, but we also provide every bit of information that you need to know in order to understand how these products work, why they work, how to use them, purchasing suggestions, and comparisons to other offerings on the market. We make it our mission to stay true to arming everyone with every bit of knowledge reasonably possible so they can get the most out of their purchase and their installation efforts. 

View all resources

Purchasing help

Visit the ResoNix Sound Deadening Buyers Guide for expert advice on selecting the best sound deadening solutions for your specific needs.

Learn more

Learn

The ResoNix Sound Deadening Materials Guide educates you on everything you need to know about automotive sound treatment products.

Learn more

Research

Explore the ResoNix Independent Testing Data page to view detailed data that highlights why our CLD products perform the best.

Learn more
rear of Porsche 911 GT3. Dark but dramatic lighting and highlights

Get personalized recommendations

Not sure where to start?

Nick Apicella of ResoNix Sound Solutions standing in front of a table with ResoNix sound deadening materials on it

From DIY to NASA

Who we are

Hi, I'm Nick, founder of ResoNix Sound Solutions. If you're after top-tier sound deadening and premium car audio gear, you've come to the right place. Whether you're a DIY'er or a major player in industries like NASA, we've got you covered. We're here to bring your audio aspirations to life.

- Nick Apicella

About us

Trusted by car enthusiasts worldwide

Discover the hype.

ResoNix Guardian installed onto the outer door skin to absorb outside road and tire noise as well as improve midbass speaker performance and output
...the owner has poured his expertise & love of the industry into everything he does & sells.

He designed his own line of sound deadening materials that have been independently tested to be best in class. The tuning ability here is simply remarkable. There’s only a handful of elite tuners across the country and Nick is a master of the craft. Best of all though is his customer service. There’s not much he won’t do to satisfy, educate and assist his customers. For all these reasons and more, I’m proud to be a ResoNix customer and highly recommend them for all of your audio needs.

Mike B | New York
Custom fabricated A-Pillar and Dash Pod by Nick Apicella of ResoNix and Matt Kim of Audio In Reach in a GMC Sierra featuring the Accuton Automotive C030AM Tweeter and C100AM midrange
Nick and ResoNix have been my #1 trusted resource for all things car audio.

Nick has taken dozens upon dozens of hours working with me on system design, tuning, troubleshooting and everything in between.  I used several competing sound deadening products before discovering Resonix and it was a massive positive change once I outfitted my vehicle with the Resonix suite of products.  The audible and measured results speak for themselves. It is clear Nick puts in hundreds of hours into honing his craft, products, and his business.

Luke O | Maine
Waveform Tuning's Mazda CX50
Man of his word

Nick (ResoNix) is a man of his word. He knows the automotive audio business. He knows his product, even better than most of his direct competition. For years, I've always known him to keep his word and he stands behind the Resonix product. I've had 7 or 8 interactions with him as a customer and I see no reason to not have more in the future.

Miguel Rios | Waveform Tuning
BMW M5 Interior
Unmatched support and quality

Finding businesses that care about customer needs is rare today. ResoNix stands out. Nick spent an hour discussing the best sound dampening options for my needs, even continuing our call while walking up a ski slope after hours. The support and product quality at ResoNix are unmatched. Their detailed installation guides make anyone proficient in vehicle sound dampening. Highly recommend ResoNix for exceptional products and support.

Scott H | Florida
Chevy Silverado door that has ResoNix CLD Squares automotive sound deadening material applied to it.
Noiseless inside while driving

My name is Rick from Maryland. I've purchased several sound deadening products from ResoNix Sound Solutions. I've loved using their CLD Squares, Rectangles, CCF sheets, Fiber Mat, and Butyl Rope. They are easy to cut and install. The result is a 2019 Chevrolet Silverado that's noiseless inside while driving. Passengers are amazed at the quiet. The stereo sound quality improvements are very obvious. I'm thoroughly pleased with all ResoNix products.

Rick B | Maryland
Caleb's Honda trunk with Focal Utopia subwoofers, Helix DSP Pro Mk3, and ResoNix Planet Waves Solderless RCA Cables
ResoNix made it easy and effective.

ResoNix has truly been a godsend in the ENTIRE process from purchase to even after the installation. Nicks service is next to none, worth every penny. I bought the medium soundproofing kit for my 2023 Honda civic, and I ended up having just enough to cover everything with some leftover fiber mat and CCF, it made a noticeable difference, specifically with how well the bass and subs sound. Everything was very easy to use and consumer friendly. Nick has helped me on any question I’ve had, better than any other, thanks again Nick!

Caleb R | Virginia

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Your questions answered.

Every vehicle and goal set is different. Start with our sound deadening buyer’s guide to understand what each material does and where to use it. If you want a tailored plan, book our sound system design and installation consultation.


To help offset the cost, up to 40% of the consultation fee can be credited toward ResoNix product purchases made within 30 days.

Most people ask this because they are not sure what physically fits. Fitment varies by vehicle, trim, and where you plan to install it. Check available depth carefully and avoid interfering with moving parts, window tracks, airbags, and service access. As a general rule, choose the thickest that comfortably fits the space. See the product page for details.

We are building an ongoing fitment sheet from customer confirmations. If you can share what fit in your vehicle, please let us know to help others.

If an item is on backorder, the estimated restock date appears on its product page and is updated as we get new information.

Domestic orders that include a backordered item will ship in two parts: in‑stock items ship immediately, and the backordered items ship as soon as they arrive. For international orders, we currently ship when all items are in stock.

You will receive an order confirmation by email, then a tracking email once your order ships. If you need an update or anything looks off contact us with your order number.

We recommend high‑quality, proven DSPs matched to your system design and goals. If you want a custom recommendation, book our sound system design and installation consultation.

To help offset the cost, up to 40% of the consultation fee can be credited toward ResoNix product purchases made within 30 days.

Yes. Start with the sound deadening buyer’s guide for material selection and placement, and the sound deadening reference information & guide for deeper technical detail and best practices.

Please open every box and wrapper fully, since small items are sometimes packed inside larger kits for protection. If something still appears missing, reach out with your order number and what you are not seeing.
We will make it right. Contact us.

Yes, we ship worldwide. Available carrier options and rates are shown at checkout based on destination and weight. Transit times depend on the service you choose and customs processing. Express options are typically faster, while economy services take longer.

Full details are here: Returns and refunds policy.

If you need to cancel an order before it ships, contact us as soon as possible. If a return is needed, follow the instructions on that page so we can process it quickly.

Get in touch!

Need further guidance or have questions? See below for more ways to get in contact and view resources.