ResoNix Sound Solutions

Premium Automotive Sound Treatment Solutions


ResoNix Guardian – Adhesive-Backed Hydrophobic Melamine & MLV Composite


Available on backorder

Quantity Discount Price
2 - 3 5% $280.25
4 - 5 10% $265.50
6 - 9 15% $250.75
10 20% $236.00
ResoNix Guardian - Adhesive-Backed Hydrophobic Melamine & MLV Composite $295.00

Currently Being Produced. ETA: Early March 2023

Pre-Order Pricing In Effect Until Our Initial Batch Arrives. 

ResoNix Guardian is a multi-layered product that is comprised of a Hydrophobic Acoustical Polyester Cloth Facing, a 1″ thick Hydrophobic Melamine foam layer, a 1/8″ thick 1lb Mass Loaded Vinyl Layer, another 1/4″ thick Hydrophobic Melamine foam layer, and a peel-and-stick acrylic-based adhesive backing. ResoNix Guardian has three main purposes. To absorb sound, block sound, and insulate from heat. The most common use for this product will be inside of doors in car audio applications for rear wave absorption and diffusion of door-mounted midbass drivers, on the underside of vehicle roofs to block broadband noise, absorb wind noise, and insulate from heat, as well as improve bass response in car audio systems. This would also be the easiest and quickest way to treat a camper van for external noise and heat. 

Each and every layer of ResoNix Guardian serves its own individual purpose, while also working together towards the common goals of better performance out of your sound system, lowered noise floor inside of the cabin, and less heat transfer to the inside of the vehicle. 


Hydrophobic Melamine foam 

The two layers of Hydrophobic Melamine foam are arguably the most important. Not only is it an excellent acoustic absorber, but is an aerospace-grade thermal insulator. This product is quite literally used on the tips of Space-X rockets for thermal insulation. Anyways, for car audio applications, Guardian will be used inside of door cavities, stuck to the outer door skin, (AFTER a CLD is applied, preferably ResoNix CLD Squares). In this scenario, the Hydrophobic Melamine is being used to absorb acoustic energy from the rear wave of the door-mounted midbass driver. This will reduce the amount of energy that reaches the outer door skin, which creates the most resonance in the door of a vehicle. This will also in turn reduce the amount of acoustic energy that can be reflected back and transferred into the inner door skin which will cause further resonance but also rattles.

Being used in a headliner/roof will offer some other benefits. With our ResoNix Fiber Mat, you only get acoustic absorption and thermal insulation. With ResoNix Guardian you also get the added benefit of being able to finally install a noise barrier (more on this below) into your roof while still having the benefits of a great acoustic absorber and thermal insulator. As of writing this (January 26th, 2023), we haven’t been able to compare ResoNix Guardian to ResoNix FIber Mat 25 & 45 in a roof installation. The Hydrophobic Melamine will also come in handy for those building out vans for camping and travel purposes. Not only will it drastically lower the noise floor in the vehicle, but it will also help keep heat out in the hot summer months, and help trap heat in during the winter, making your home on wheels more comfortable and efficient. 

Now, melamine being an open-cell foam would normally be problematic for automotive installations. But for ResoNix Guardian, a proprietary process is used to treat our Melamine to make it fully hydrophobic, inside and out. This isn’t some cheap spray you can buy at Home Depot that will wear off in 4 months. We can guarantee that this product will never absorb water for the life of your vehicle. Due to this, it can be used without worry in door cavities, on the underside of hoods, and even on underbody pans and other places on the outside of the vehicle. No matter what you throw at it, ResoNix Guardian can handle it.


Mass Loaded Vinyl

ResoNix Guardian features a single layer of 1/8″ Mass Loaded Vinyl that has a weight of 1lb. per square foot. This Mass Loaded Vinyl floats between the two layers of Hydrophobic Melamine. Mass Loaded Vinyl is the noise barrier portion of ResoNix Guardian. This will serve two purposes. First, to block outside noise from entering the vehicle, and second, from blocking and reducing the amount of acoustic energy reaching the panel that it is installed onto. For example, let’s say we have ResoNix Guardian installed onto an outer door skin behind a midbass speaker. The rear wave from this midbass speaker would originally fire right into the outer door skin causing a great deal of resonance. Now, with ResoNix Guardian in place, most of that acoustic energy that makes it through the Hydrophobic Melamine layer will be blocked by and reflect off of the limp, non-resonant layer of Mass Loaded Vinyl, therefore lowering the amount of energy that is transferred to the highly-resonant outer door skin. This logic can be applied anywhere else in a car audio installation. Subwoofer enclosures, midbass enclosures, etc. 

For uses elsewhere, such as roofs or belly pans, the Mass Loaded Vinyl will act as any noise barrier does, and help block any noise trying to make its way into the cabin. Finally, the automotive market has a way to install a noise barrier into roofs and other unconventional areas due to the nature of ResoNix Guardian being able to handle any and all automotive environments and being installed using an extremely resilient yet easy to use peel-and-stick acrylic-based adhesive. 


Non-Woven Polyester Acoustic Fabric Facing

A mouthful, I know. But what this is, while the first time we have seen it used in aftermarket automotive sound treatment products, is pretty self-explanatory. This top layer of ResoNix Guardian is a polyester fabric that is oil and water resistant, and helps achieve two different goals. First, it provides protection and some strength for the Hydrophobic Melamine foam to help protect it from rips and tears, but it also helps tune the acoustic absorption properties of ResoNix Guardian by providing a specific acoustic resistance which helps us target even better low-frequency acoustic absorption which is perfect for when using it in midbass and subwoofer applications, as well as road/engine noise absorption. This fabric facing, just like the Hydrophobic Melamine, is also extremely heat resistant and can be used just about anywhere in or on a vehicle. 


Acrylic-Based Peel-And-Stick Adhesive

As with the rest of our products, the adhesive we have chosen for ResoNix Guardian is the best for the application. It is able to work and adhere to Hydrophobic Melamine while also being able to stick to pretty much any clean surface and can handle an extremely wide range of temperatures. This allows for an easy installation of ResoNix Guardian without having to worry about long term reliability.


What Does This Combination Of Materials Leave Us With?

Since the materials that ResoNix Guardian is comprised of are fully hydrophobic, each panel can be cut into custom shapes and sizes to fit your individual application needs. The peel-and-stick adhesive makes for an extremely easy installation and finally allows for the installation of a noise barrier inside of door cavities and roofs without needing to figure out a complex mechanical mounting solution, or sacrificing full coverage which finally allows you to have an effective noise barrier, acoustic absorber, and thermal insulator installed anywhere in your vehicle, inside and out. This truly is our most versatile product to date. If you have any questions on where and how this will benefit your installation, feel free to give us a call or send us an email anytime.



. 12″ x 12″ – 1.375″ thick

. 6 Pieces (6 square feet) per box (Same coverage as a Blackhole Tile Full Box)

. Acrylic Based Peel & Stick Automotive Grade Adhesive Backed

. USA Manufactured

. Acoustic Specifications Posted Below



Hydrophobic Melamine Features

. Lightweight, flexible, water resistant, and self-extinguishing

. Class A fire rated

. Aerospace grade acoustical and thermal insulation (r-value per inch: 4.16)

. Thermal range: -300°F to 350°F (intermittent to 400°F+)

. Used in aircraft, aerospace, marine, and architectural applications

. Made in Germany and treated/assembled in the USA


Mass Loaded Vinyl Features

. 1/8″ Thick Mass Loaded Vinyl

. STC Rating: 26

. Made In The USA 



Non-Woven Acoustic Fleece Facing Features

. Black Polyester Non-Woven Fiber

. Oil & Water Resistant

. High Heat Resistance – Commonly Used In Engine Compartments

. Passes MVSS302 Spec For Flame Resistance

Hydrophobic Melamine Data Sheet

ResoNix Sound Solutions Guardian - Hydrophobic Melamine Website Data Sheet

Mass Loaded Vinyl Data Sheet

ResoNix Sound Solutions Guardian - Mass Loaded Vinyl Website Data Sheet

Acoustical Non-Woven Fleece Facing Data Sheet

Peel & Stick Adhesive Backing Data Sheet

USA Manufactured

ResoNix is an automotive sound treatment company that offers top quality products which provide superior performance in their respective categories. No gimmicks, no baseless claims, no nonsense. Constrained layer dampers, decouplers, and noise barriers are part of our soon to be released line-up with a focus on data-backed, solutions-based products developed by enthusiasts, for enthusiasts.


24B Holt Drive,
Stony Point, NY 10980

(845) 553-9500



ResoNix is an automotive sound treatment company that offers top quality products which provide superior performance in their respective categories. No gimmicks, no baseless claims, no nonsense. Constrained layer dampers, decouplers, and noise barriers are part of our soon to be released line-up with a focus on data-backed, solutions-based products developed by enthusiasts, for enthusiasts.

24B Holt Drive
Stony Point, NY 10980

(845) 553-9500