Tim, you are correct. When two actors go in for the Kiss or are very close together, you have to either mute one of them or phase reverse one of them. By doing one of the two you will maintain the normal sound of the mics. That is how I solve that problem. As for RF Noise, my Shure systems can use any of 1,000 channels so I can always, so far, find something open that is clear and clean.