In phase
- Two periodic Wavesreaching peaks and going through zero at the same instant are said to be “in phase”.

If I use 2 mic's on guitar. One SM57 up close and a LDC about 3 feet away. Should I.
A) Put on a set out head phones and listen to where the signal gets louder or weaker (but moving the mic around)
B) Just start using the phase reverse button and always use one mic out of phase