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Old 19th April 2010, 04:08 AM   #1
domtw is offline domtw  France
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Default TS measured at home, your best way and your incertitudes

Hello,
I have done some TS measurement with a few different tools: WT3 and Limp mostly.
The results I obtained showed some disparities and I am not sure what is best to believe...
I would like to know, from your experience, what is your method of TS measurements, what are your tricks...
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Old 22nd April 2010, 05:23 AM   #2
dangus is offline dangus  Canada
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Try measuring some known impedances, like an inductor, resistor, and capacitor. If those can't be read accurately, then you have little hope of measuring a woofer properly.

I've used the signal generator + DMM method plus added mass. And, the IMP/M which was a heck of a lot quicker, although it takes more pieces and wires and time to set up. (Laptop, IMP/M box, power amplifier...) (The mass was a piece of solder, measured accurately in a chemistry lab.)

I suggest building an interface box with a built-in gainclone power amp (or two), buffer amplifiers, reference resistor, and switching as required to allow doing various tests using Speaker Workshop (or other software). Including a USB sound device, like a Behringer UCA202 (with better power supply filtering, preferably), would make it very convenient.

I don't know for sure how accurate my measurements were, but they were usually reasonably close to the numbers in the specifications. Except maybe with some Radio Shack mini-woofers.

Last edited by dangus; 22nd April 2010 at 05:28 AM.
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