Down4Sound 320 mil Sound Deadener - RillaMat - 38 sqft

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d4s-320mil-38 sqft
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  • Down4Sound 320 mil Sound Deadener - RillaMat - 38 sqft
  • Down4Sound 320 mil Sound Deadener - RillaMat - 38 sqft
MSRP: $299.99
Now: $195.49
Was: $229.99
— You save $104.50


Down 4 Sound 320 Mill Sound Deadener 38 sqft Acoustic Foam 3 in 1

  • each sheet is 11 x 22
  • 22 Sheets
  • RillaMat 5XL the THICKEST Basshead Deadener in the World.

Made from the highest quality components, Butyl Rubber, aluminum and Foam

Before applying deadener, ensure the area is fully clean; we suggest using 80% rubbing alcohol. Once thoroughly cleaned and dry, apply sheet, and roll.

If applying in cold weather under 60 degrees, use a heat gun to apply or warm the area.

Watch out for airbag sensors and fastening holes for interior panels.


Warning this product may cut you, use safety gloves.

We are not responsible for any damages or cuts or applying errors.


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Warranty Information

Warranty Information

Your new Down4Sound product is covered by 1 limited warranty if purchased from Down4Sound or an authorized Down4Sound dealer. This warranty does not cover improper installation, accidental damage, misuse, abuse, improper wiring, operation of unit outside of listed specifications, or any product that has been modified or repaired by anyone other than Down4Sound. Your warranty covers defects in materials and/or workmanship ONLY and is not an insurance policy. The warranty only covers the original owner of the amplifier.

All warranty returns must be accompanied by the original sales invoice or receipt. You must contact us to request an RMA number prior to sending any returns via the RMA request form on our website. You are responsible for the cost of shipping your product back to us for warranty examination. If your product is covered under warranty, shipping back to you will be at no charge to you – if your product is replaced/repaired outside of warranty you must pay for return shipping and repair bill prior returning of the product or if no defect is found you are required to pay for return shipping only.

At the sole discretion of Down4Sound your product will be either repaired or replaced when it is being covered under warranty. In the event of shipping damage due to improper packaging on products being returned to Down4Sound the customer is liable for the cost of all damages, necessary repairs, or replacement. Be sure to properly pack your return!

*  Extended additional warranty purchased on amplifiers take in affect from the date of purchase and must also be stated on orginal sales invoice or receipt. 



Refund/Return Policy:


Down4Sound - Hours of Operation

Monday 6am - 9pm PDT
Tuesday 6am - 9pm PDT
Wednesday 6am - 9pm PDT
Thursday 6am - 9pm PDT
Friday 6am - 9pm PDT
Saturday 8am - 4pm PDT
Sunday Closed
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4 Reviews

  • 5
    D4S Deadener

    Posted by Minnesota Jim on Jun 16, 2022

    This 320 is no joke. I put down one layer on my floor and roof and my Kia is a different animal. The best part is even though it’s hella thick, it’s still pretty easy to work with. Absolutely worth the money.

  • 5
    320 mil mat

    Posted by James on Dec 20, 2021

    Very great mat I used on back window of Tahoe and made the back window rattling go away pretty good I have a lot more deadner to put on but just from the back window I can tell a night and day difference

  • 5
    Rilla deadening

    Posted by Diamond on Nov 25, 2021

    I love it so far so good.

  • 5
    Sound deadner

    Posted by osvaldo corona on May 28, 2021

    Product is great nice and think way better than what I used 15 years ago.

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