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Old 28th December 2002, 01:41 AM   #1
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Join Date: Jun 2002
Location: Melbourne, Australia
Default How do you measure Vas by added mass method?

I have searched everywhere for this info. Plenty of people mention it but I can't find the actual step by step procedure. Any help or links would be appreciate.
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Old 28th December 2002, 08:11 PM   #2
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Join Date: Apr 2002
Location: Llanddewi Brefi, NJ
Default you use the added mass to calculate compliance

1) find f(s)
2) apply a blob of modeling clay, with mass M' ( 5g for an 8" woofer) , and find the new f(s), or fs'
3) M (grams) = M' / (((fs/fs')^2)-1)
4) Cms =1/(((2 pi fs)^2)*( M))
5) Vas = Cms* d * (c^2) *A^2

where Cms is expressed in cm/dyne
d = density of air in gm/cm^3
c = speed of sound cm/sec
A = area of cone in cm^2
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