@jules
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Thank you for your response.
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I learned about Symmetrical Impedance from the DPA website below.
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So, generally, the Output Impedance provided refers to the impedance between Pin 2 and ground, and when a microphone is described as 'balanced,' it means that the impedance between Pin 3 and ground is identical to that of Pin 2 and ground, correct?
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Thanks to you, I am getting closer to understanding the correct definitions.