Usually, the most important T/S parameters are mostly easy to measure except Vas.
Re, Fs, Qes, Qms and Qts are easy to measure.
Usually you measure Vas with delta-compliance because it’s more accurate.
Other method we hear a lot about is delta-mass.
In this URL, they talk about an easier method. I’d like to know if this method is good or not.
Better than delta-compliance? Better than delta-mass?
Measuring Vas (equivalent air compliance)
To measure Vas, use a good solid enclosure of known volume that’s about a cube of the nominal speaker size. Determine the total volume, including the speaker cut-out and that trapped by the cone with the speaker mounted on the outside of the box for easy access. Measure the resonant frequency in this situation as well as the free air space resonant frequency.
Vas = Vb((Fb/Fs)^2 – 1)
Vb is the volume trapped by the speaker and box
Fb is the resonance frequency of speaker and box