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Old 14th March 2003, 03:31 PM   #1
joz is offline joz
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Default Vas used as a model closure

Whats the results if we build a cabin with exactly the same volume as the Vas of a driver? In a closed cabin. In an ported cabin?
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Old 14th March 2003, 04:53 PM   #2
ksl is offline ksl  Estonia
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i made a ported box for PYRAMID WC1220
it's Vas is 160 litres and i took 150 litres for enclosure volume and the result is good for this speaker with a Q=1,6

normalized graph my project pics
blue color
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Old 14th March 2003, 05:01 PM   #3
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Default you end up with a *Pi* alignment

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Old 15th March 2003, 09:17 AM   #4
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VAS represents the spring action of the spider + surround of a LS unit. VAS is an equivalent volume of air of a box that causes the same spring action as the Cms of the unit does.

So when placing a speaker in a closed box with the same volume as the VAS of the unit the total equivalent Cms halves and Q_box and F_box become sqrt(2) times that of the bare unit (Qts and Fs). Thatís all. The related formulas are:

Q_box = Qts * sqrt (1 + ( VAS/V_box ) )

F_box = Fs * sqrt (1 + ( VAS/V_box ) )


F_box = Fs * Q_box/Qts
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