Why does PA with microphone plugged in make high-pitched feedback?
Loudspeakers bring amplified noise, going to the microphones
that are amplified to bring more noise from the loudspeakers, going
to the microphones that are amplified to bring more noise from the
loudspeakers, going to the microphones that are amplified to bring
more noise from the loudspeakers, going to the microphones that are
amplified to bring more noise from the loudspeakers...