TS measured at home, your best way and your incertitudes

[domtw]

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...

[dangus]

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.