You say that if driver types have similar impulse response (...), combined with having identical FR "there is no possible origin of different sound (...) they will sound the same". Is there a particular reason you completely discard any distortion metrics? On this exemple we have here, at 40 Hz and 94 dB SPL (reasonable level) we have THD+N 100 times more than what any electronics here would be considered a headless panther and in the red part of the chart. If you look at the many IEMs reviewd here, the bump in distortion can litterally be just anywhere. For example the 2K last multi BA reviewed here as big bumps at 400Hz and 2K. On top of that, it's only
Total harmonic distortion, we don't have any measurments of the distortion profile what are the actual harmonic content. We don't have intermodulation distortion neither or the exact relation between group delay and actual phase response. To put forward such a strong statement, is to dismiss all that as inaudible. Why then should we even care about the performance of dacs and amps we purchase, why then all the measurements here of electronics would even be relevant?
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