Reiterated, that is not how it actually works. I acknowledge, that You follow the common habitual standards in amateur audio. I do not criticise You personally. It is only so, that on a board that has the term "science" in its name, there should be room to point to a more systematic approach.
Answers to the questions stated in post
https://www.audiosciencereview.com/...rements-with-accelerometer.36254/post-1365890 would reveal very much more than:
- speculating about one reason of many for some singled-out effect observed by somebody else using unknown instruments with an object known only by its name with unknown origin without any comparison to another specimen of the same type ... c'mon!
Reiterated, a measurement needs an idea what the object of measurement is about. That's called a "model", some would say a "theory". I already gave You the example of measuring a distance. That needs an idea of space. Is space a continuum? No! Is space static? No! What about a ruler then?
More related to the topics discussed here: the Klippel is less about the funny machinery, it is about a model of the speaker and the room it sits in during the measurement. Without that model the data is useless rubbish. The Klippel
IS the mathematics derived from that model.
You kind of playing around with the accelerometer didn't relate the data to a model. Hence the data is useless. Even Your conclusion is kind of debatable at best. Why should less amplitude of panel activity as it was kind of detected by the accelerometer be of any relevant benefit? Btw, is the accelerometer, to put it easy, "linear"?!
Sorry for being that verbose, but I mean it and don't want to bother You.
What drives the panel movement?! See questions above. The answer will for sure impact Your view on the, if You will, problem and lead to more practical solutions, if You still mind it.
Only in German, sorry:
Über Lausprecherbau mit Waveguides, also mit Schallführungen für Hochtöner
www.waveguide-audio.de
That's systematic, isn't it? Result: once the box is stiffened by braces and damped with wool, the (in)famous constr/lay/ doesn't do much more ...