Possible phase problem?

Hi SH  I think that using the third mic may not be such a good idea at all. It is not so much a matter of phase but timing. If you allow for the speed of sound to be approx 1 ms per foot you are going to have all this extra ambience that is 75 milliseconds behind the mikes that are up close. If you could record it onto a third track, and have control later and maybe advance the ambient track by 75 milliseconds then maybe, but as you cannot then no. Can you control the amount of the third mike that is mixed in with the two inputs? If you can then monitor the audio in headphones and see, but I am guessing you wont like what you hear. Why would you want to include a whole lot of ambient sound anyway. It is only going to reduce clarity of the front mikes. Forget the audience or ambience just get the action up front. Even the front mikes will be a bit ambient anyway as the mikes on stands are going to add some of that.

I am hoping that whoever is mixing is going to balance the sound of the front mikes with the headset mikes or that is what should be happening anyway. But of course the front mikes on the stands are not going to be as loud as the headset mikes. Unless they are back well behind the speakers and the mikes on the stands are reasonably directional. Another option is to set up two completely separate mikes on the stage and feed them into your camera and put them in a position to catch all the dialgoue.