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In Reply to: RE: Acoustic wall panels and floor tiles posted by David Aiken on August 27, 2010 at 23:49:33
Hi,
One more question regarding the corners ?
Will creating plywood cabinet (say 6/7 ft high) in the corner ( triangular / square shaped ) will help ? I know it won't be effective as a dedicated bass trap but will it be atleast 75% effective ?
Also for home , would it be ok for panels to be reflective at higher frequencies. If lot of those are absorbed, the room would sound rather dull right ?
I am just looking at achieving good enough treatment using usuals material
Thanks,
Hifisound
Follow Ups:
> Will creating plywood cabinet (say 6/7 ft high) in the corner ( triangular
> / square shaped ) will help ? I know it won't be effective as a dedicated
> bass trap but will it be atleast 75% effective ?Not only will that not help, it will preclude putting bass traps where they are needed most.
--Ethan
Edits: 08/31/10
Re the plywood cabinet: what kind of construction, what materials, are you using any absorption material in it? A cabinet, ie a closed space for storage, won't do much at all.
It's impossible to answer you question of effectiveness relative to dedicated bass traps without measurements since not only the materials used but the construction also play a part in how effective a DIY trap is. As to the effectiveness of your "dedicated bass trap", the big question is which trap since different products can differ widely in effectiveness. No one can answer that kind of question without measuring your device and comparing that result to measurements of some particular dedicated bass trap and really those measurements should also be made in the same location.
Re highs and absorption: the ideal absorber would absorb equally at all frequencies. In practice that isn't possible but it is possible to make absorbers which work reasonably smoothly over a very wide frequency range. That's what you want for absorption. The wider the bandwidth of absorption and the more even the absorption over that bandwidth, the less the absorber alters the frequency spectrum of the reflected sound and the closer that spectrum is to the spectrum of the direct sound. If you do that, the room won't sound dull. The reason rooms often sound dull with DIY absorption is that people use thin layers and/or materials which only absorb in the high frequency range. That makes the sound dull because of the excessive absorption of high frequencies. Provided an absorber has a reasonably even absorption over a wide range, there should not be problems about dullness unless a very large proportion of all the room surfaces are covered with absorption devices.
I previously suggested Everest's "Master Handbook of Acoustics" as a source of info on DIY treatment. I think you need to do a fair bit of reading before you start doing anything, and if you can I'd also recommend spending a bit of time listening in a couple of rooms with acoustic treatment so that you can develop some sort of feel for what kind of results different treatment approaches give. If you don't know what kind of results you're trying to achieve you actually run the risk of getting a result that you won't like. If you don't know how to go about achieving the sort of result you want to achieve, then it's going to be hard to achieve that result.
David Aiken
just to give an example of what I was thinking about :
http://www.gaisbauer-furniture.at/Gaisbauer_Furniture_-_Biedermeier_Specialist/Gaisbauer_Furniture/-8441-3-6-en--/cms.html?height=560&width=620&id=6&nodeid=3&_language=en
I was thinking of using sound absorbing plywood to make this.
Anyways as you rightly said, I will go through the book first.
Also I will try using small rugs at various places on the floor to see how much reduction happens.
Thanks a lot for your help
Hifisound
I know of no plywood with sound absorbing properties above normal plywood and normal plywood does not absorb enough to be used as a treatment on its own.
A cabinet such as the one in your link will do little on its own. Any absorption will be minimal. The curved front surfaces will provide a little scattering of reflections from the corner but probably not enough to be particularly noticeable.
David Aiken
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