5.2 MICROPHONE CALIBRATION
Over time, the sensitivity of your microphones will decrease as the materials age and are exposed
to the elements. Calibrating your microphones allows you to measure and track their sensitivity
over time.
It should be noted that most sound level calibrators only output 1 frequency (1kHz) and there is
anecdotal evidence that higher frequencies are affected more as microphones age, so while this is
not a complete test it does give a useful indication of overall microphone health.
To calibrate your microphone, you will need:
Any standard IEC942 Class 1 sound level calibrator with a 94dB output
at 1kHz.
A 1” microphone adapter. Please contact sales@frontierlabs.com.au to
order one of these.
To measure the sensitivity of your microphone:
1. Insert the 1” microphone adapter into the calibrator.
2. Remove the foam windshield from the microphone by cutting the zip tie around the base.
3. Plug your microphone into the BAR-LT and insert the end into the microphone adapter.
4. Turn the BAR-LT on and navigate to Menu Utilities Mic Calibration.
5. The Mic Calibration screen shows the sensitivity of the microphone, the serial number,
microphone type and date of manufacture of microphones connected to channel A and B.
6. Turn the calibrator on and set it to 94dB output. The sensitivity of the microphone should
be around -28dB ± 2dB when a 1kHz source is used.
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