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30th October 2008, 04:37 PM
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#1 |
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Did it Himself
diyAudio Member
Join Date: Nov 2003
Location: Gloucestershire, England, UK
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Efficiency method to find VAS
I have been looking at the website for CS Audio's Woofer Tester 2 and they mention measuring VAS by either delta-mass, test box or efficiency method.
Now what could this efficiency method be? Had a go on Google but nothing turned up.
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www.readresearch.co.uk my website for UK diy audio people - designs, PCBs, kits and more |
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30th October 2008, 06:26 PM
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#2 |
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diyAudio Member
Join Date: Jun 2002
Location: USA, MN
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You can also do it with either a vented box or a vented-sealed combination.
I've never heard of an "efficiency method".
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Our species needs, and deserves, a citizenry with minds wide awake and a basic understanding of how the world works. --Carl Sagan Science is a way of thinking much more than it is a body of knowledge. --Carl Sagan |
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30th October 2008, 06:29 PM
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#3 |
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diyAudio Member
Join Date: Sep 2006
Location: New England
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Vance Dickason's Loudspeaker Cookbook has an equation for efficiency that includes a "K" constant (varies with Vas units you want to end up with), Fs cubed, Vas and Qes.
The WT manual simply says you can calculate it by re-arranging the eff. formula to solve for Vas - assuming you know the efficiency, Fs, Qes and K factor. If you run their basic Fx test you will get Fs and Qes. All you need then is to meas. the efficiency or use spec. sheet data and the box vol. you will use. |
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30th October 2008, 07:29 PM
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#4 |
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Did it Himself
diyAudio Member
Join Date: Nov 2003
Location: Gloucestershire, England, UK
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Thanks. Sounds a bit rubbish, getting a consistent and accurate efficiency measurement isn't going to be that straightforward. I'll stick to using test boxes then.
__________________
www.readresearch.co.uk my website for UK diy audio people - designs, PCBs, kits and more |
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31st October 2008, 12:12 AM
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#5 | |
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diyAudio Member
Join Date: Jun 2002
Location: USA, MN
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Quote:
Might be interesting to do an uncertainty analysis on that method  What value and loading/boundary conditions you use to "measure" your efficiency would have a fair effect on Vas. +/- 3dB will double or halve Vas - I would stick to the test boxes or added mass method....
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Our species needs, and deserves, a citizenry with minds wide awake and a basic understanding of how the world works. --Carl Sagan Science is a way of thinking much more than it is a body of knowledge. --Carl Sagan |
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