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'[Pic]:RE: Has this been done before? Speaker testi'
2001\09\26@213020 by Kasm Consulting

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Jan,

No offense taken at all.
I'am aware of the Qc,Qt,Fs figures.
The optimum way to get these figures for a given
speaker pair (For Matching) would be to take an
actual impedance reading over a range of freqs and then
calculate from the graph produced. There is quite a bit
of variance amoung speakers, even if the same model.

Steve.

{Original Message removed}

2001\09\27@012231 by Kevin J. Maciunas

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On 26 Sep 2001 21:28:33 -0400, Kasm Consulting wrote:
> Jan,
>
> No offense taken at all.
> I'am aware of the Qc,Qt,Fs figures.
> The optimum way to get these figures for a given
> speaker pair (For Matching) would be to take an
> actual impedance reading over a range of freqs and then
> calculate from the graph produced. There is quite a bit
> of variance amoung speakers, even if the same model.
>

Not that this particularly my field (he hides behind his CS academia!)
but the way a colleague and I have done this in the past is to use an
impulse noise spike (a maximum length sequence) and then capture this
(with a calibrated mic) and do the FFT...

We have an old bit of kit called the "IMP" which plugs into a PC
parallel port which does all the noise/capture and then you can do your
own thing and get all the Q's and impedance curves and response curves
too...

Just my $0.02
/Kevin
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Kevin J. Maciunas           Net: spam_OUTkevinTakeThisOuTspamcs.adelaide.edu.au
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University of Adelaide      Fax: +61 8 8303 4366
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SOUTH AUSTRALIA

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