Heading in the right direction, just need to take it a bit further...If they are out of phase, this might be a problem. I believe if they are exactly out of phase, they cancel eachother out, and you get no sound at all. I am assuming that both mics have the same source, ie, 1 person talking into 2 mics spaced a bit apart and then fed thru? I know that there is a switch on most consoles to fix the phase issue, not quite sure how it works, seeing as I am not primarily a sound guy.
Ok, well i'm defiantly more sound than lighting, and this is a really common problem. Feedback will never be the result of simply having two mics close to each other, to who ever said that. The only time that becomes an issues is when you have to many open mics in a condensed area.
I've run into the problem you speak of many times, having 30-40 mics in a 45ft by 26ft stage. yes the correct analysis was one of the first i believe, the phase is simply incorrect. if you have two identicals sounds (its a sin wave) and they are not correctly in phase they will completely cancel each other out. so if your board has a phase button, all digital boards do, and some higher end analog, but most don't. Simply press the phase switch on just one of the mics.
More basic, just move them farther apart, why do you have 2 mics that close together, if one just just a redundancy or backup, simply turn it off if not needed.
That help?
There is a third common reason for multiple mics and that is to provide dedicated feeds, as in a local reinforcement feed and a separate broadcast or recording feed. In that case both mics are live but feed two different, isolated systems.
Or the Grateful Dead's Wall of Sound that used the same speaker system for house and monitors along with dual closely spaced, polarity inverted mics summed together and signing into only one of them.Let's not get into specifically designed mic setups for cancellation as used say for the podium in the middle of a football field where background noise is a problem...
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