I agree with the impedance tests. I cannot get a reconciliation between the 403 loudspeaker tests and systems that I have used for over a decade. The Smith&Larson Speaker Tester Pro is a solid accepted standard by those that know it and use it. I gave up trying to get the same driver tested on both systems to get the same Thiele Small parameter numbers. A few 10ths of the measurement difference is normal. But Inductance is way out, and Q is also way off. Maybe there is a cure for this. The OEM testing market for loudspeakers needs something that is accurate and solidly dependable. I used to recommend Smith&Larson to OEM manufacturers, but they stopped production almost 10 years ago.
I am very heartened by your software upgrades. This is not a little improvement. It is a huge improvement of a very worthy piece of test equipment.
Mark