If you read my post, you would have noticed that I was referring to the output impedance of the mic preamp. I didn't mention its input impedance because it is irrelevant in the discussion.In audio, voltage matching is the main method of working. This means Rin >> Rout (rule of thumb factor 10). Most preamps work with input impedances of greater than or equal to 1 KOhm.
And that's exactly what I discussed.The main problem is the interaction of the complex load with the individual factors.
With all respect due to Ing. Wuttke, I didn't learn anyhing from his document. It is a vulgarization, destined to technically untrained public. It's electronics #101.This is discussed in detail in the books on communications engineering. If I find Ing. Wuttke's contribution in the conference documents, I will post the lecture.
It doesn't mean it is not true, just that it doesn't go deep into understanding complex situations.