Since a time I bought an article in pdf format
written by Paul White about the JBL 3 series.
By my own will, I bought them; and I could prove by myself his words:
-the upper mids sounds a touch "forward" for me-.
I listened them and effectively: the upper mids are not only
a touch; are too forward for me too.
Exactly around the band of the 6KHz the phoneme "s" sounds "sparkly"
I must to give down till the middle that band in the equalizer.
Maybe only for making mixes goes +/- well, but if you try
to listen music; simply they're not the better ones.
Thanks to Paul White for writing a good approximative description
of those studio monitors.