Could also be an Impedance matching problem....?
Although it does not define the Mic input Impedance in the manual, I believe the KN7000 expects a High Impedance Microphone for optimum performance. If you use a Low Impedance mic, the output will be much lower.

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Willum
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Willum

After silence, that which comes nearest to expressing the inexpressible is Music.
Aldous Huxley
( especially when the music is played on a KN7000....)