ResoNix Sound Solutions

Premium Automotive Sound Treatment Solutions

ResoNix Mega CLD Squares: Heavy Duty Sound Deadening Material – 20 Pieces (20 Square Feet)

What do you do when you already have the best performing and best overall value CLD on the market? Offer that same product for 20+ years without any performance increases like everyone else? Everyone else, maybe. Here at ResoNix, absolutely not. We get crazy and make a product that has even better overall performance and an even better overall price-to-performance value than even our original ResoNix CLD Squares.

If you are looking for the very best CLD Sound Deadening Material, then good news. You found it.

A free ResoNix Roller is included with the purchase of ALL of our Constrained Layer Damping products.

Previously known as “Super Max Mega Pro CLD Squares”

Made In America.

Currently On Backorder. ETA: June 1st, 2024


Available on backorder

Quantity Discount Type Discount Price Per Item
2 Percentage 5 $223.25
3-5 Percentage 10 $211.50
5-10 Percentage 15 $199.75

ResoNix Mega CLD Squares Constrained Layer Damper Sound Deadening Material

Currently On Backorder. ETA: June 1st, 2024

The ResoNix Mega CLD Squares’ name isn’t the only silly thing about them; the performance is as well. What do you do when you already have the best Constrained Layer Damper sound-deadening material on the market? You get silly with it.​

ResoNix Mega CLD Squares are a constrained layer damper sound deadening product comprised of butyl rubber and aluminum. It is adhered to panels of the car to lower structure-borne vibration and resonance for a lower noise floor and a better foundation to build a sound system off of. What makes it different from our standard ResoNix CLD Squares is the thickness of the aluminum constraining layer. On the original ResoNix CLD Squares it is 4-mil thick. On our Max CLD Squares sound deadener, we tripled it and stepped it up to 12-mil thick. A stronger and stiffer constraining layer means better damping performance. The SAE J1637 test results show the differences between the original ResoNix CLD Squares, and the Mega CLD Squares. The Mega CLD Squares sound deadening material has a higher Composite Loss Factor than the original CLD Squares, but it also has a MUCH wider bell curve on the Composite Loss Factor Scale. This means much higher performance at higher temperatures, which is always the struggle in the automotive environment. 


Our ResoNix CLD Squares Mega CLD Squares sound deadening material can be used to treat resonance and vibration in many different applications. It is most commonly used on the following…

Door Skins – Door Panels – Trunk Lids – Hatches – Rear Decks – Rear Deck Cover Panels – Roof Skins – Wheel Wells – Wheel Liners – and More!


Guaranteed Best Performance In The Constrained Layer Damper Automotive Sound Deadener Category!

Made in the USA – Category Leading Adhesion – Will Last Longer Than Your Vehicle – Category Leading Thermal Rating – Results Blow The Competitors Out Of The Water 🙂

What makes our products better than the rest? Click here for a detailed run down on why ResoNix is the best option.


Physical Specifications

  • 12” x 12”
  • 20 Pieces – 20 Square Feet Total
  • 120 mil thick butyl layer
  • 12-mil thick aluminum layer
  • 0.64 Composite Loss Factor @ 200Hz
  • 1.1 pound per square foot
  • For enthusiasts, by enthusiasts

USA Manufactured


Guaranteed The Highest Performance Out Of Any CLD-Style Automotive Sound Deadening Product On The Market And We Have The Data To Back It.

Click Here to see the Independent Test Results, and Click Here to read more about the SAE J1637 testing. See the Technical Spec Sheets below.


Recommended Amount Of ResoNix CLD Squares Sound Deadener

We get emails regarding this often. The problem is, every application and situation is different. Every panel is different, every car is different, and everyone’s end goals are different. With our Sound Deadening Reference Information & Guide section, as well as our ResoNix Sound Deadning Buyers Guide, we try to give you as much information as possible in order to help you make the most informed decision possible. But to make it very quick and simple, in our shop, we almost never do less than 60% coverage on panels that require treatment. This includes door skins and panels, rear decks, roofs, quarter panels, trunks, interior plastic trim, and more. In cases where we are just trying to achieve the best end result possible, we aim for nearly 100% coverage. We figure if we are doing it, we may as well do it once and do it right. 

ResoNix Mega CLD Squares Sound Deadening Tech Specs & Information Download



Note: Previously Known As "Super Max Mega Pro CLD Squares"

An excerpt from our sound deadening Reference Information & Guide page. 

A Constrained Layer Damper works by using a viscoelastic layer (the butyl) and a constraining layer (the aluminum) to convert mechanical energy (the vibration of a panel) into heat via the viscoelastic properties of butyl while the constraining layer helps the panel keep its shape and resist deformation.  The primary way that CLD achieves this is through shear forces in the butyl layer caused by being constrained between the panel and the constraining layer while the panel is vibrating (bending). When the panel flexes and deforms, the viscoelastic layer naturally resists and wants to “snap” back into place. See Figure 1. (Click to expand)

Figure 1.

ResoNix CLD Squares should be used where you want to cut down on any structure-borne vibration and resonance. Long, flat, and thin panels, like outer door skins, door panels, quarter panels, and roof skins are the biggest offenders. Reducing structure-borne vibration helps lower the overall noise floor of the vehicle while also lowering the resonance caused by sound systems to an acceptable level.  This can result in a faster decay of bass and midbass frequencies.  Slow decay in these frequencies can cause “muddy” sounding bass response or can make it seem like repeated fast bass notes are blending together.  See figure 2. (Click to expand)

Figure 2.

ResoNix CLD Squares are the best choice for all applications where you want to attack structure-borne vibration to reduce undesirable resonance and vibrations. We chose a butyl compound specifically designed for vibration damping and paired it to an aluminum layer thickness that is as stiff as possible, without risking weakening the adhesive bond on contoured panels.

Our detailed how-to guides on how to get the most out of our products can be found in our Reference Information & Guide section. In the meantime, please properly clean the surface of all dirt, grease, and oils before application, and use a roller to properly adhere the CLD Squares to your panel. No heat is necessary.


Customer Installations Of ResoNix CLD Squares Sound Deadener

Standardized Objective Testing For Sound Deadener Products - SEA J1637

ResoNix Super Max Mega Pro CLD Squares Interpolated Composite Loss Factor Data 200hz
ResoNix Super Max Mega Pro CLD Squares Composite Loss Factor vs. Temperature
ResoNix Super Max Mega Pro CLD Squares Spec Sheet

USA Manufactured

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