Nice Site to calculate Absorbers - Home Theater Forum and Systems - HomeTheaterShack.com

Old 04-25-07, 10:33 AM
gto
Inactive

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Nice Site to calculate Absorbers

http://www.mhsoft.nl/Helmholtzabsorber.asp

br Gerd

Old 04-25-07, 11:18 AM
HTS Senior Moderator

Bryan Pape

Join Date: Sep 2006
Location: Wildwood, MO (St. Loui
Posts: 5,209
Re: Nice Site to calculate Absorbers

Just be careful. The formulas for the Helmholz absorbers are incorrect on that page - as they are on many web sites. There was an error in a book that's been propogated. The rest of the calculators work OK.

Bryan

I am serious... and don't call me Shirley.

Bryan Pape
GIK Acoustics
bpape is offline
Old 04-25-07, 11:50 AM
gto
Inactive

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Re: Nice Site to calculate Absorbers

Its allways risky with Helmholz Resonators. We had a lot of disskusiones and research and some works to, and we descoverd, that this formula is close.
This Formula should work
f = 172,71 * Wurzel(A/(V * (l + (0,732 * d))))

mit
f = Frequenz [Hz]
V = Volumen des Resonators [in liter]
l = Länge des Kanals in [in cm]
A = Fläche des Kanals ( = pi * r*r)
d = DURCHMESSER der Fläche des Kanals [in cm]
pi = 3.1416

Thanks to Joachim from kea audio for this
Gerd

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