This is from the measurements thread.
Im curious to what others use inside their speaker boxes (if their speakers have boxes).
Im curious to what others use inside their speaker boxes (if their speakers have boxes).
I use this
Parts-Express.com:Sonic Barrier 1-1/4" 3-Layer Damping Material w/PSA 18 x 24" | acoustic damping foam black hole sonic barrier acoustic foam damping foam damping sonic impact sonic110408 cabinet_damping
or I use carpet pad because I have some left over.
Im considering adding this Elemental Designs to the walls then placing the foam over it.
Parts-Express.com:Sonic Barrier 1-1/4" 3-Layer Damping Material w/PSA 18 x 24" | acoustic damping foam black hole sonic barrier acoustic foam damping foam damping sonic impact sonic110408 cabinet_damping
or I use carpet pad because I have some left over.
Im considering adding this Elemental Designs to the walls then placing the foam over it.
Hi Doug, as for a source in the US. Here is a link to what I think is the same product on pyrotek's us site: Pyrotek - Soundproofing Solutions as I mentioned I thought it was called something else now, and I think that is sorberflex.
You could ask them if it is the same thing as the soundsorber barrier. It certainly looks very similar.
Tony.
edit: I've added the before/after nearfield graph (blue with soundsober plus a small amount of fill, black bare box) and the images of the product and its use in the speakers to add the context 🙂
edit2: oh and it looks like it isn't an Aussie product at all, I think it is a US product, with a local manufacturing plant here in Sydney (which is where I got mine from).
You could ask them if it is the same thing as the soundsorber barrier. It certainly looks very similar.
Tony.
edit: I've added the before/after nearfield graph (blue with soundsober plus a small amount of fill, black bare box) and the images of the product and its use in the speakers to add the context 🙂
edit2: oh and it looks like it isn't an Aussie product at all, I think it is a US product, with a local manufacturing plant here in Sydney (which is where I got mine from).
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Oh and for the record, I tried stripping off the aluminium fabric to see what effect it had, and it was a lot less effective!!
Tony.
Tony.
Hi Brett
Here are a couple of other options
http://www.pyrotek.info/documents/datasheets/1017_Sorberflex_ALR_English_A4.pdf
E-A-R Specialty Composites -- noise, vibration, shock, damping, cushioning, sound, control
Google aircraft bulk head sound isolation
Cheers
Thanks for that Mal, I'll have a longer read later. Is this stuff expensive and available to non industrial customers?
I'm also going to try some Malthoid dampcourse inside the speakers as it's cheap and easily available. It's very similar to 30lb roofing felt in the US.
A friend gave me an old polyester fiber comforter, so that's what's going inside my cabinets. Otherwise I would've gotten some woolen or cotton blankets from a thrift store, or put some fiberglass insulation inside an old pillowcase.
Hi Brett, Just found the receipt. I purchased it in Nov 2005 so pricing could be way off. It was 1 sheet which I think was 1.3M X 1M and it cost $138 AU.
The description on the receipt is Sound Barrier 32 AL 4.5KG
I think that is the 25mm stuff as that seems to be the thickness of the outer layer of foam, the 32 I think is the nominal overall thickness counting the barrier layer and second thin foam layer. They have a dandenong warehouse, and a manufacturing plant in Girraween Sydney. I believe that the pyrotek product that 56oval linked to is the same thing, as I think it may have been renamed.
Pyrotek - Improving Performance
The product datasheet is here Soundsorber Barrier technical data I think that it is now known under the name
I bought directly from the factory at Giraween, The sales guy was helpful and there was no problem with me buying just a single sheet. Soundgaurd appears to be the name of the Australian division of the bigger american parent pyrotek.
I don't think the product you linked to is the same thing. It doesn't look like it has the barrier layer (could be just the absorbtion bit) Mine didn't have a self adhesive on it either. The graph also looks quite different, though it is not using the same coeficients so it is hard to compare.
Tony.
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I thought I should do a new graph, showing the same driver in the same cavity measured with and without the soundsorber. This isn't quite as smooth as the previous graph, probably largely due to the fact that I did the nearfield measurement at "normal listening levels" with the mic amps gain turned down to avoid clipping, also the speaker was sitting in place close to things that could interfere rather than on the speaker testing platform away from everything.
However as the original graph was comparing possibly different drivers (I have four) in probably different cabinets (which have been modified since), probably 5 years apart using different software to take the measurements I decided I should do it again 😉
Anyway here are the nearfield measurements I just took. Note that these are completely raw unsmoothed measurements. I took the measurement in holm impulse but imported into speaker workshop to do the graph as I had more control over how it was presented. As you can probably imagine even just the sound of the MLS pulse sounds quite different when doing the measurements.
edit: note also that there is a small amount of polyester fill in the remaining space inside the speaker cavity as well.
Tony.
However as the original graph was comparing possibly different drivers (I have four) in probably different cabinets (which have been modified since), probably 5 years apart using different software to take the measurements I decided I should do it again 😉
Anyway here are the nearfield measurements I just took. Note that these are completely raw unsmoothed measurements. I took the measurement in holm impulse but imported into speaker workshop to do the graph as I had more control over how it was presented. As you can probably imagine even just the sound of the MLS pulse sounds quite different when doing the measurements.
edit: note also that there is a small amount of polyester fill in the remaining space inside the speaker cavity as well.
Tony.
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I have been using a product called Damplifier for a couple of years. It made a world of difference in road noise when applied in my car, and it also makes a noticeable difference when applied to the inside of loudspeaker enclosures (even with the 1" MDF for my sub, knocking on it with the material applied sounded noticeably more dead). Yes, I know it is a lowly "car audio" product, but it is actually worthwhile stuff IMO. It seems to be less expensive than some of the more esoteric "hi-fi" stuff as well. The material is butyl-rubber based so it is not messy at all, and does not smell. It has been tested up to like 400°F and it doesn't fall off.
Other than that, I usually apply a layer of 1/8" closed cell neoprene foam on top of the Damplifier, and some 1.5" open-celled "egg crate" acoustic foam. Acousta-Stuf is added as needed.
Other than that, I usually apply a layer of 1/8" closed cell neoprene foam on top of the Damplifier, and some 1.5" open-celled "egg crate" acoustic foam. Acousta-Stuf is added as needed.
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