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Old 2nd August 2008, 04:38 PM   #1
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Default Curious about Felt as a Speaker Gasket

You may or may not know that it is possible to get peel-and-stick thin felt sheets from fabric stores for about $1.00 a sheet. The sheets I have are 12" x 9".

This would be similar to the thin felt you would find on the bottom of a table lamp.

Since it is 12" and I just happen to have 12" speakers, I'm wondering that people would think of using the felt as a gasket between the wood and the speaker frame.

Would the felt give a sufficient seal?

Also, and far more likely to work, you can buy 2 Mil sheets of dense closed cell craft foam at most hobby and craft stores. Where I live it is not available in peel-n-stick, but it would be in larger cities. Also, not only is it available in 9"x12" but is is available in 12" x 18" sheets, and I think thicknesses up to 5 mils (though that seems to thick).

This stuff is at or near $1 per sheet. If you are using small speakers you could get several gaskets from on sheet.

So, first the FELT, what do you think, would it work?

Next, has anyone every used the foam sheets for such an application?

Joann Fabric - Felt 9"x12" (peel'n'stick0 ($1.59)

Create for Less - foam sheet 9"x12" (peel'n'stick) ($0.84)

Create for Less - foam sheet 9"x12" (not peel'n'stick) ($0.69)

Create for Less- foam sheet 12"x18" (not peel'n'stick0 ($0.89)

This is not soft squishy cushion foam. This is a dense pliable closed cell foam 2 mils thick.

Just curious.

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Old 2nd August 2008, 05:02 PM   #2
Mooly is offline Mooly  United Kingdom
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I suspect not (the felt), the seal has to be airtight and airtight under sudden pressure changes. Even if it were 90% good it's not good enough in a sealed enclosure. The characteristics of the speaker would be altered to say nothing of the cone hitting the end stops due to no "air" loading. That is something I have seen (heard) on a speaker that had the tweeter replaced and the tech didn't fit a gasket at all. How about a bead of silicone rubber on the cabinet, let dry before fitting speaker. If you are determined you can squeeze that stuff onto a lightly greased table in a bead and leave to dry. Then you have a length of the stuff to use as you wish.
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Old 2nd August 2008, 05:31 PM   #3
el`Ol is offline el`Ol  Germany
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You will hardly find anything else in German drivers from the fifties and sixties.
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Old 2nd August 2008, 08:56 PM   #4
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I'm currently rebuilding some existing speakers, in the previous build I just fastened the bare metal of the speaker frame to the wood then laid a bead of silicone caulking around the inside between the speaker frame and the wood. So it was sealed air tight. But when the time came, I was still able to get the speaker out by simply breaking the bead.

This time I'm going to use the 2 mil foam material. I think that is going to work fine.

But, I still wondered about the felt, it is thin and reasonably dense, so when compressed under the rim of the speaker frame, I'm thinking it would be air tight. But, I'm not sure.

The advantage is that the felt available to me has the peel-n-stick backing on it, and that make things easier to work with.

Still, I cut the gasket today out of the foam, they look pretty good.

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Old 3rd August 2008, 06:30 AM   #5
Mooly is offline Mooly  United Kingdom
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Am sure you have been up to a "ported" design when it's playing and felt the air moving in the port. Imagine trying to block that pressure totally. It's more than you might think, and it will find any weak points in the seal if there are any.
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