Rharv is correct. Inches can matter a great deal. You can get phasing problems on the higher frequencies with mic placement differences that seem very small. Also, there is proximity effect to consider on some mics, depending on the pattern it uses (not that this is bad; it can be very good on some instruments, but very boomy or muddy on others). And remember, your mic technique involves three dimensions, not just two; sometimes placing mics higher above the instrument works better.


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