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Nice Site to calculate Absorbers

2K views 2 replies 1 participant last post by  gto 
G
#1 ·
#2 ·
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
 
G
#3 ·
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.
http://mb.abovenet.de/allabout-hifi/index.php/topic,112.0.html
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:clap:
Gerd
 
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