Microphone sensitivity conversion basics

FAQ #383 Updated August 13, 2007

Question:

For some reason the conversions are not making sense to me. You state that a typical value for a dynamic mic is -75dBV/microbar. How does this convert to 0.00018 Volts? Can someone please give an actual equation? Thanks.

Answer:

To go from dbV to volts:
1. Divide -75 by 20. Answer is -3.75
2. Take the antilog of -3.75. Answer is 0.000177.

To go from volts to dbV:
1. Take the log of 0.000177. Answer is -3.75.
2. Multiply -3.75 by 20. Answer is -75.

Equation:
dBV = 20 * log (volts)

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