A & B Components 

Generally speaking, the sensitivity of the microphone will increase when we raise the impedance at 2.2K of RL, the results as the graph 1 & 2. The sensitivity
also rises if we give higher voltage to the microphone, graph 3 &
4. RL = 2.2K / 3.0K RL = 2.2K / 1.0K
Voltage = 2V / 4.5V Voltage = 2V / 1.2V Equipment : B&K 2012 + B&K 4227 Microphone : 6.0mm x 2.7mm 42+/3 dB
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