Audimute Panel's

[KINGS TREASURE]

Hello all. I just came from this website. http://www.audimutesoundproofing.com

They have these nice looking panel's made from cotton. They make sure to let you know they use no fiberglass. Question which is better for acoustic panel's fiberglass or cotton. Also can I use these panel's for bass traps The price's look good.

 

[no. 5]

Question which is better for acoustic panel's fiberglass or cotton.

Better? Whichever does the job is the right one.

The numbers on the website look weird to me: an SAC of over 100% at a few frequencies? I know a measured SAC of over 1.0 is possible, but it makes it hard to compare.

 

[Savant]

no. 5,

The higher the absorption coefficient, the better the absorber, all other things being equal - mounting, test method, etc.

And absorption coefficients measured using the reverb chamber method (like most are) are not percentages. Therefore, there is nothing impossible about coefficients over 1.0. (Just in case there was any confusion about that.)

 

[no. 5]

no. 5,

The higher the absorption coefficient, the better the absorber, all other things being equal - mounting, test method, etc.

And absorption coefficients measured using the reverb chamber method (like most are) are not percentages. Therefore, there is nothing impossible about coefficients over 1.0. (Just in case there was any confusion about that.)

Maybe not confusion exactly, but the information on the audimute sound proofing website did elicit a furrowed brow based on some other information I had read, but thanks for the clarification.

 

[Savant]

no. 5,

No worries. Much like anything, there is conflicting/confusing information on the Internet about this. It is unfortunate. There are even some (otherwise) trusted acoustics texts that don't explain the concepts clearly. Sources like Riverbank Acoustical Labs and Leo Beranek (et al) are the ones to trust in this regard. And they make a clear distinction between chamber absorption coefficients (not %s) and others (some of which are %s). Back when I was in their employ, I wrote this FAQ for Auralex, which might help explain things more.