92 Bedrock SMxx operating manual © Bedrock Audio BV, 2019
A2.2. Typical pressure field to free field corrections for the BAMT1-MP309
The correction factors below are added to the measured values to arrive at the expected
free field sound pressure level measurement when using the B&K4226 multi-frequency
calibrator.
Frequency BAMT1-MP309
31.5 Hz 0.3
63 Hz -0.1
125 Hz -0.1
250 Hz -0.1
500 Hz -0.1
1 kHz -0.06
2 kHz -0
4 kHz 0.5
8 kHz 1.8
16 kHz 4.8
A2.3. Reflections from the instrument body when using the BAMT1-MP309
If the microphone is fitted directly on top of the SMxx, without any length of XLR cable
inbetween, then reflections from the instrument body will affect measurements. The table
below gives the effect of those reflections per octave band. To avoid these reflections, use a
cable with a minimum length of 1 meter.
Frequency BAMT1-MP309
31.5 Hz -0.02
63 Hz 0.00
125 Hz 0.00
250 Hz 0.02
500 Hz 0.03
1 kHz -0.01
2 kHz 0.02
4 kHz 0.01
8 kHz 0.04
16 kHz -0.01
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