If you want to get something legit of this nature, keep the AC power entirely away from the audio room. The wires in the walls can give off AC hum. Run DC over

If you want to get something legit of this nature, keep the AC power entirely away from the audio room. The wires in the walls can give off AC hum. Run DC over shielded twisted pair cables. At this level you'll also be doing something about noise from aircraft, wind, trucks, birds, and everything else.