How does excessive sibilance measure?

I am super sensitive to excessive sibilance as I am sure most of us are, but I know very little about whether this can be formally measured on test equipment like one sees in Stereophile's reviews. I do know, however, that it is about much more that simple frequency boosts in the sibilant range. Are there any techies out there than can shed light on this?
The most common cause of sibilance is that it's embedded in the recording due to vocalist technique, non-optimal microphone choice or positioning. Sibilant sounds are a normal part of speech and are characterized by louder than average sound centered around 8kHz.

For music playback a key element for not making sibilance any worse than what's already on the record is to use equipment that can properly handle transients at various SPLs. That's a non-trivial task. Speakers that have off axis peaks in the sibilant range should also be avoided.
Read somewhere that sibilance is in the 5 to 7 kHz region. That's the same area where metal midrange/midwoofer breakup occurs. Easily compensated with a (LRC) parallel notch filter after the low pass. With the value of the inductor being low (.08 to .12), timing/phase issues minimal. But that's only one of many possible causes. Heard it happen with just the wrong choice of speaker wire for a particular setup.
Here is a good article on why.


Music source? TT? CDP? ?