In my thread "Ignore the speakers behind the screen" you can see the arrays completely upstage of the people on lavs. Although we didn't use them that way, we had good GBF from the lavs even with the speakers upstage. The speakers upstage are aimed at the audience not the stage. Adding a monitor that is aimed at the mic is not going to help the GBF situation. My answer to people who want a monitor on lavs is NO.
Mac
The following was sent to me in a PM:
As I read his statement he has the speakers on the back wall of the stage?
How your speakers are setup is not the question.
I disagree. Since Sean's speakers
are on the back wall, I think the fact that the lavs on my show worked fine through the speakers on the back wall illustrates that it is entirely possible to make this work.
The type of speaker, how it is aimed, how it is optimized, and the type of microphone are all going to have an impact on the results, but even in this less than ideal situation it should be possible to get acceptable results.
Mac