Copied from a parallel thread:
So I'd recommend to give the skin effect/phase distortions a try when it comes to measurings. Not in the form of phase measurings, but rather in the form of complex waveforms -- such as a cymbal crash or an excerpt of it, resp. --, if possible analogue or in high-resolution digital (96 or 192 kHz sampling rate) for better signal-shape discrimination/identification due to the avoiding of transient corruption by the antialiasing filter.
The next step would be to rate the level of difference using studio listening tests. I will be the first to admit it would be best if a better qualified person than me did this testing
PS Can anyone lend me a recording studio and some sensitive monitoring equipment for a few weeks? :-)