This is a tool to help calculate the maximum distance that a microphone can be placed from a talker.
These estimates are NOT SUBSTITUTES for thorough meter checks and listening tests of completed installations!

Step 1 Choose your method of measurement
Step 2 Enter the level of the talker at 1 meter (average talker = 66, weak talker = 60, strong talker = 72)
dB SPL
Step 3 Enter the measured ambient noise of the room
dBa SPL
Step 4 Enter the amount of noise cancellation you will use
dB
Maximum distance that the talker can be from the microphone =
 
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