Fran,
My K2/100 S/N 04031 KSB2 board is stock except for the filter width
which is 2.5 kc.
I use the Elecraft (Heil) MD 2 microphone.
On the air reports I receive would indicate that my audio is excellent.
Adjusting the filters in my opinion is the most important part of
getting good audio response.
My 2 cents worth.
73, Bob VE3XM
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