Help with audioTester 3.0, determining Vas

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Hi

I' m measuring my first speakers, I'm using the very nice AT 3.0 tool
The first measurement seems correct
But the second measurement indicates that the Vas is 0.05 . I am using the added mass method.
I tried two speakers, with different added masses but no luck. The firs speaker that was 4" measured 0.00 Vas (5g and then less)

The first measurement (no added mass)
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The Second measurement (10g added)
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The Setup
An externally hosted image should be here but it was not working when we last tested it.



Any thoughts on this?
A
 
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