Audio electronics do not run on 110 volts AC. They run on DC from 5 volts on up. The job of any well designed power supply is to filter out all AC and regulate the supplied DC voltage accurately. If any "noise" (which is AC) gets through sell it and get a piece with a decent power supply.
Having said that there are instances were filtering can make a difference. As an example, the high voltage power supplies that charge the diaphragm of electrostatic loudspeakers is very simple. There is no current involved. It uses a step up transformer to get to 250 volts AC then a voltage amplifier of serial diodes and caps to get to 6000 volts. Any noise online might be amplified in the process and affect the diaphragm's performance.