Not necessarily doubting you, but where did you get this info? I've received termlab software updates, but never anything to do with calibration. Their pressure sensors have a K factor, that has to be put into the software, but that's it. It doesn't have any moving parts, like a mic, so it shouldn't change.

Its really irrelevant, for pressure sensor based measurement anyway, as long as the same calibration is used for each competitor...loudest will still be loudest. I've heard that some shops / promoters will play with the K factor, to make them seem louder, but loudest will still be loudest.

For mic based systems, though, all bets are off. In my experience, they lack repeatability above about 140 db.

Toby