Speaker Box Insulation

Speaker Box Insulation Material

Do you want your speakers to BOOM so loudly that you can feel it in your chest? Then you will want some insulation in your speaker box. If you want to get the best sound possible from your speakers, the most important things to look at are the type of speaker box, the size of the speaker box, and whether or not it has absorption inside it.

In this article, we will discuss speaker boxes and how to use insulation to improve their sound.

What are Speaker Boxes?

A speaker box is an enclosure that holds and protects your speaker driver, while also enhancing the sound. When you play loud music, especially music with heavy bass, the drivers vibrate and move around, so a decent-quality speaker box is essential to keeping your gear safe. Without a speaker box, even a high-quality speaker driver will not sound very good. Your speaker box affects the overall sound quality and even the volume of your speaker system.

Here are the two main types of speaker boxes.

      • Sealed: A completely airtight enclosure that builds pressure as the speaker produces sound. It requires more power to run and does not emit as loud of a sound, but sealed speaker boxes produce a more precise sound.
      • Ported: Has a hole in the enclosure that prevents the speaker box from pressurizing. Ported speaker boxes are more energy-efficient and louder, but not as accurate.

How Does Insulation Help in a Speaker Box?

Adding insulation or absorptive materials to your speaker box will increase the performance of your speaker. The insulation in the speaker box basically tricks the driver into thinking that it is in a larger speaker box, therefore giving your speaker more volume and depth. You‘ll want to fill the box, but don’t want the absorptive material to actually touch any part of the speaker. Each situation is different, so you’ll need to tinker a bit with the amount of material used to get the best results.

Another advantage of adding insulation to a speaker box is sound absorption. The insulated speaker box will dampen distortion created by backwaves. When a speaker has no absorptive materials behind the driver, sound will travel behind the speaker cone and reflect off the interior of the speaker box. This reflected sound will make its way back to the speaker cone and cause the sound coming out of the front of the speaker to be distorted. Lining the interior of your speaker enclosure with insulation will prevent the sound from reflecting and cut down the backwave energy. We recommend combining the acoustic material with a sound deadening material like Damplifier Pro and our Speaker Tweakers installed behind the speaker to get the best sound quality.

Is a Bigger Sounding Speaker a Better Sounding Speaker?

When it comes to speaker enclosures and subwoofers, you don’t necessarily need to “go big or go home”, but a bigger speaker box will give your speaker a louder sound and a low frequency bass. However, a smaller speaker that is insulated properly will also pack a lot of punch and give you smart things to say to your friends.

Our Recommendations

Wondering what sound absorbing material to use in your speaker box? We’ve got you covered!

Here are a couple of our top options:


EcoVerb is a cotton fiber acoustic panel that can be used for many different sound-related projects. EcoVerb is Class A fire rated and will help soften the back of your speaker box and improve the overall performance of your speaker. It can easily be cut to size and glued onto the interior of your speaker box using a spray adhesive


CelluZorbe is our most budget-friendly acoustic panel that is Class A fire rated just like EcoVerb. CelluZorbe is made of recycled cellulose and only comes in one color, but it will be hidden inside your speaker anyway. Install it with spray adhesive just like you would the EcoVerb.

If you have any more questions about speaker box insulation or soundproof boxes like a quiet bitcoin mining box, feel free to contact us, and one of our experts will be happy to help!

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