Helmholtz Calculator

longsoughtfor

longsoughtfor

Searching for the sound
Is the standard helmholtz formula as given in the spreadheets on John Sayers site (Knightfly's corrected version) valid down to very shallow "depth from wall" numbers?

I am asking because I have an untreated ceiling that I don't want to add too much material to (thus lowering the height) but thought I might get away with a couple of H-absorbers on either end. From the spreadsheet, I can get down to 250HZ with a 1" depth (8in wide 3/4" slats, spaced at 1/10").

Somehow that seems non-intuitive. Anyone here with experience using absorbers this shallow?

Thanks
Kevin.
 
Thanks Rick - I may try that newsgroup at some point... looks a bit like swimming with sharks though ;)

Cheers
Kevin.
 
looks a bit like swimming with sharks though
Click to expand...

You can say that again. I BARELY made it out of the pool alive:D In fact, that site is what finally brought me to my senses regarding acoustics. Playing with gunpowder is safer:p

fitZ
 
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