Heh, nice one Astral Plane!
Very much along the lines of what I was going to sugest as a last result -I ask the lead singer if hearing him is important. Divide and Conquer!
I find that the vocalists complain if the stage levels are to high and the backline, drums and cymbals mask the vocal monitors. Turn the backline down and the vocalists are happier, but the guitarists then complain they can't hear the cabs six feet behind them, even though you're only just hearing the vocals over them 100 ft away! Ususal problem here is their cab is sat on the floor and most of their sound passes straight past their legs. Bung it in the monitors if they can handle it, at least then it's pointed towards their ears.
This is where good communication and diplomacy are essential. Guitarists can be very sensitive (even precious) about their "sound", which includes the volume it is produced at, even to the detriment of the entire band's sound. Live performance and sound reinforcement is always a compromise to a degree, and working with them to find a best balance is the best course of action, although you are bound to meet individuals with whom there is no helping. This is when getting the vocalist on your side is one of few options left to you.
Remember that as a rule of thumb, you need to be able to reinforce to a level about 10dB above the stage sound to be able to retain some control over the overall instrument levels. Is this is not possible due to PA headroom, to not being able to give the vocalist enough gain before feedback, or because the resultant level is too loud for the venue/event/audience, then you will have a sound that is compromise by this stage level.
I have had one gig this month where I was asked repeatedly to turn down the guitarist, he was so loud on stage that I was not amplifying his cab at all. We had set levels in soundcheck and then he had turned up at showtime. There was nothing I could do bar send messages to stage to ask him to turn down at source.
Then saturday's gig was the opposite -bassist and guitarist in a theatre show who were only too happy to set their levels to whatever was needed, because some of the singers were wearing hairline lavaliers and it was difficult to amplify their solo spots. Very professional guys, and even the drummer was obliging behind his acrylic screen.
It's an age-old endemic problem, and I don't think it will ever go away.
Nathan.
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