Above software along with the sound card of my laptop PC + a digital tester, allowed me to make several useful test in order to determine T-S parameters. The accuraccy of the signal will depend of course of the quality of the sound card used.
I think its worth a try.
If you want to make a good measure, for first you need to "use" the loudspeaker, personally I use a small (6 V ac out) transformer connected to the speaker for 8/10 hours, you' ll have a better realistic measure.
I hope this will help.