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DEI door sound damping kit for all generations

DEI door sound damping kit for all generations

Regular price $24.99 USD
Regular price Sale price $24.99 USD
Sale Sold out





Emissions: Emissions do not apply.

There are no shipping restrictions on this item.

Warranty: lifetime

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Miata doors aren't big relative to most car doors, but they're still big expanses of mostly flat sheet metal, which makes them very prone to resonance and rattling - knock on the outside metal and take note of how loud and rattly it is. This kit, like our sound damping kit, uses pre-cut pieces of DEI's Boom Mat sound damping material to absorb those vibrations and quiet down your interior. They also make a big difference to how good your music sounds (since your speakers won't rattle the doors anymore), and give a solid "thunk" when you close the door, as opposed to the normal rattle. Easy install, just remove the door panel and the plastic sheet behind it (watch that black goo, it gets on everything), firmly press the pieces into place, re-assemble, and enjoy your quieter car. Includes enough pieces for both doors (one kit = one car). 

This kit is designed for the NA and NB, but will work for the NC and ND as well with a little trimming (it's not too bad to cut with a razor blade or good scissors). 

Boom Mat is a premium quality sound damping material that keeps interior panels from vibrating and generating noise by trapping that noise between an asphalt-free butyl lower layer and a 40 mil (.004" / .1mm) thick aluminum top skin (.080" / 2mm thick in total). Since Boom Mat doesn't need to cover the entire area to do its job, you spend less money and add less weight to get the job done. 

While this kit doesn't make a huge difference to the decibel measurement, it's in the right range, and keeps the metal panels from acting as transducers. Which makes the car much more livable an improves the sound of the stereo.

Customer Reviews

Based on 12 reviews
Bill H.
Impressive improvement for a low price.

I'm impressed at what a difference this has made. Installation was relatively easy. It's made the whole driving experience feel more solid. No more rattling in the doors, and my speakers sound better.

Patrick B.
Cuts door noise by a lot

Easy to install, reduced NVH from the doors by a noticeable amount. It is admittedly a pain to get enough pressure on the tape through either the woofer hole or the regulator cavity, but once it's on, what a difference it makes.

What vibrations and sounds ???

Man installing this kit to my door not only made it sound stiffer and stronger but the noises from when someone would close my door would grind my gears but after installing it man did I see some changes in noise and for the door sounding less fragile. Installation was simple nothing out the ordinary, however I did lose 1 clip for my door. Be careful when you take them off other than that it was well put together.


Sound damping .. wait sound ? I didn’t hear anything once I had installed this kit very simple and easy to install instructions are as easy as 1,2,3. The noises coming from my door or sounding too fragile almost sounds like I bought a whole new door definitely would recommend.

Love it!

I would especially recommend the door sound deadening kit as the NA miata has very tinny, drumlike door acoustics. After installing the kit, the doors sound much nicer on closing, and rattle significantly less with music and regular driving. $25 dollars is a great price for the amount of change you get inside the cabin. It's hard to stress how much better closing the door sounds now, similar to the solid sound of an Audi. I combined this with both the chassis damping kit along with the carpet insulation kit, and the car is a lot more comfortable to drive long trips in. If you only run a soft top, I would just recommend the door kit, since you don't really get the benefits of the chassis noise reduction as the top itself lets in so much noise.