xlx -
I paid a bit more attention to my units this AM, and I think that a lot of what you're hearing above, the differences, via these videos, is due to recording artifact.
To me, indeed, as I've said before, there's just a slight bit of difference, and it does favor the 9500i, in terms of tonal depth/quality. However, this difference is truly "slight," and I do think that the difference in volume adjustment between the units (I have the mirror louder than the detector), as well as the placement, contributes.
I wish I could better help, but this is a very difficult question!
