Just a quick follow-up. Played last night, couldn't put the speakers behind us because of an overhang at the front of the stage, but used the advice given here on ringing out the system. Big difference! PFL'd my mics for good gain staging, kept my main master faders lower, left my channel strip EQ's flat, and had tons of headroom - and no feedback!
Used a single CM12V for a monitor, and my bass player complained that her vocals were
too loud in the monitor! Woo-hoo! Never had that problem before.
It was nice playing four sets without worrying about feedback, and the sound was great. Thanks again to all who helped.
Regards,
Bob