Interesting discussion.
One thing that hasn't been touched on is that the further the mike is from the actor's mouth, the harder it is for them to hear themselves. Sound has a way of vanishing into the ether on stage, and it is absolutely startling to rehearse a show in the studio for weeks and then suddenly feel like you're singing into a pillow when you get onstage. There's no "ring" in there, and if you've ever wondered why experienced actors suddenly start blowing their voices when they start previews, that's your answer. It's incredibly diorienting when you can hear the orchestra loud and clear, but not your own dynamics in relation to them, and certainly not anyone else on the stage you're supposed to be singing/ harmonizing with.
This can all be fixed somewhat by putting vocals into the onstage monitors--it's not quite the same as really hearing yourself live, but it helps tremendously, especially in heavily amplified shows or if you're singing upstage of center (where you can't hear the sound bounce back from the house)
As has been pointed out earlier, the headset/boom mikes give you a much better shot at wining the vocals-in-monitors war, because they're so close to your mouth that there's less of a chance you'll end up with reamplification and/ or feedback.
As a Broadway actor concerned about vocal health and strain, I would rather wear headset mikes on both sides of my face than a hairline mike. Unfortunately, most producers care more about the look and less about the safety. I think it should be a big issue at Equity, along the lines of the raked-stage war, but it will only happen if more actors fill out accident reports for vocal strain and fatigue.
PS...many of us do know how to project, but that never enters the conversation, and in today's screaming-pop-music high-belting world, it would probably just be more dangerous.
Updated On: 4/24/12 at 01:44 PM