How do you measure Vas by added mass method? - diyAudio
 How do you measure Vas by added mass method?
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 Multi-Way Conventional loudspeakers with crossovers

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 28th December 2002, 01:41 AM #1 diyAudio Member     Join Date: Jun 2002 Location: Melbourne, Australia 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. __________________ Best-ever T/S parameter spreadsheet. http://www.diyaudio.com/forums/multi...tml#post353269
 28th December 2002, 08:11 PM #2 diyAudio Member     Join Date: Apr 2002 Location: Llanddewi Brefi, NJ 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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