Any design we did for an install that involved audio only, or lighting and audio we specified that all the audio circuits were on the same ground, isolated from all other grounds in the building. They had to be dedicated circuits ( nothing other than audio gear on them ) The audio system also had to be on its own electrical phase.
Any lighting or equipment that operated with motors or compressors like Air conditioning, refrigerators, motors, pumps etc., had to be on separate circuits with different grounds and electrical phase.