Why does the speaker squeak when the teacher's loudspeaker is turned on?
If this is not what I said it is estimated the headset plug line and microphone connection problems, or not full of power. Not really, I suggest contacting the manufacturer to consult!
Some amplifiers are wheeled switches, and the squeaks that appear when they are open are in fact the impact of the current
I know the winning amplifiers are now basically push-button switches, which are not generated by the switch.
