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wrote:
What's wrong with mono PA? I don't like it. Is that OK ?

Well it's been a while since I was a live sound guy, but for
physical reasons you generally can't get true stereo coverage in most
venues, as far as trying to make your lineup on stage match across a
stereo soundfield through a PA system. You just have too narrow an
area you can effectively cover with a stereo image in most venues.
There is pricey high end stuff installed in some concert halls that you
aren't supposed to know is a PA, and sometimes there is synthesized
stereo processing used sometimes which claims to compensate for the
physical limitations of a room (I haven't used that system), but that
kind of thing is the exception rather than the rule and you aren't
likely going to encounter that gigging around coffee houses and bars.

Probably what is most useful in stereo is reverb/echo, perhaps
some synth sounds or the odd guitar effects that pan across maybe, or
maybe being able to pan the sound away from a hot mic used by an MC
that walks out into the audience maybe. Still generally I think most
live sound is done with everything panned dead center, if not plain old
mono. And
a bad balance will be as sucky in stereo as it is in mono, and even
harder to get right.

Will Miho
NY Music and TV Audio Guy
Staff Audio / Fox News / M-AES
"The large print giveth and the small print taketh away..." Tom Waits