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Old 5th September 2008, 11:47 PM   #11
claudio is offline claudio  Italy
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When using the added mass method to measure the VAS, I prefer to place the driver horizontal.

About the voltage to feed the DUT, assuming you are using a sinewave signal,
0.5 Vrms are considered small signal.
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Old 6th September 2008, 12:15 PM   #12
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Originally posted by mashaffer
Should I be using more signal?


i would say it depends on how we want to use the
specific driver.

If it is used as a horn driver in a home installation driven
at moderate levels, the small signal parameters are
more important.

For low efficiency application in normal boxes or open
baffles the large signal parameters are important IMO.

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Oliver, RFZ believer (?)
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Old 6th September 2008, 01:58 PM   #13
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If you want to measure small signal parameters (e.g. T/S parameters) then the smallest signal that gives you consistent and repeatable measurements is the signal to use. That usually means less than - typically much less than - 0.5W. That the parameters may have been measured at 50mW does not affect that fact that they will give you good modeling results even at 1W, but perhaps not at 10W. That specific upper limit depends on the driver.

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Old 6th September 2008, 07:17 PM   #14
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Here's a post I put up on our forum some time ago on properly measuring T/S parameters and all the efforts we went through to do it.


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Old 6th September 2008, 07:30 PM   #15
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Lots of good info in that post. I do have one question though. If the driver is facing upwards, yes on the updard stroke it will be working against the weight of the cone and gravity, but this will be cancelled out exactly by it being assisted by gravity and the weight of the cone on the downward stroke, will it not?
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