. If for some reason you do decide to use both at the same time, you will probably want to
throw one out of
phase to prevent a canceling
effect or comb filtering.
Three things...first, there's no reason to use both at the same time. It will cause you nothing but trouble, for all the reasons mentioned. It's a backup, or, depending on design choices, sometimes one will be aimed down, one up, to account for dramatic height differences between speakers.
Second, to
border on being pedantic, you're flipping it out of
POLARITY, not out of
phase. The one has nothing to do with the other.
Polarity is an either/or thing that can be flipped and is electronic in nature and independent of time;
phase is a continuous shifting scale related to time, measured in degrees. When a perfect
sine wave is 180 (or some multiple) degrees out of
phase, it will produce the same
effect as being of reversed
polarity, but they are NOT the same thing, and this is NOT the case for complex non-sine signals.
Third, flipping
polarity will in most cases not do a thing to help you here. If your source were in a fixed position, DELAY would help, to time (
phase) align the two mics), but since your source moves in relation to both mics, delay won't help you here.
Just use one mic at a time