Shure

Gain Changes Based on Mic Placement, Number of Open Mics

MIC PLACEMENT FORMULA

 

                 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

 

NUMBER OF OPEN MICS FORMULA

 

                 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
 

 Revision: 2/5/2007