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Shure Tech Tip: Gain Changes Based on Mic Placement & Number of Open Mics
Below is a mic placement formula from Shure Applications Engineering:
Distance Old
20 X log ( ———— )
Distance New
Example: How much will the gain of the sound system increase if mic is moved from 12 inches from talker to 3 inches from talker?
12/3 = 4
log 4 = 0.6
0.6 x 20 = 12 dB of gain increase
Below is a number of open mics formula from Shure Applications Engineering:
NumberOpenMicsOld
10 X log ( ————————- )
NumberOpenMicsNew
Example: How much will the gain of the sound system decrease if the number of open mics goes from 4 to 9?
4/9 = 0.44
log 0.44 = – 0.35
-0.35 x 10 = -3.5 dB of gain change