I have a few computers connected to a mixer, which is connected to an amplifier, which powers two speakers. They are all on the same circuit. I have contractors over building a structure out back and they have their Skill Saw connected to an external outlet, which appears to be on the same circuit.
When they start their saw, I hear the cut through my amp. It starts as a buzz and then I head the distinct circular saw wzzzzeeeeeeer sound.
Is this normal, or is the fact that I am essentially hearing current draw in my amp a problem? If is it not normal, is this an amp problem, or a house circuit problem, or something else?
current draw
... you are hearing electrical noise that is produced by the electrical motor ... it is caused by arcing at the motor brushes ... if the motor is brushless, then the speed regulating switching circuit injects the noise into the power lines