Am Freitag, den 18.08.2017, 11:43 +0200 schrieb Ralf Mardorf:
"Audio feedback (also known as acoustic feedback,
simply as feedback,
or the Larsen effect) [snip] The principles of audio feedback were
first discovered by Danish scientist Søren Absalon Larsen, hence the
name "Larsen Effect"." -
https://en.wikipedia.org/wiki/Audio_feedback
Ah, okay! Thanks!
Greets!
Mitsch