Gonna toss a related idea out there: Converting single-phase AC power to DC requires treating a lot of ripples. Maybe an audiophile should convert three-phase AC power to DC to ensure higher power quality?
This has nothing to do with 50/60 Hz ripples, the point of having a personal power transformer is to isolate from high-frequency noise.
A motor-generator is a better solution. Preferably with a big flywheel.
Funny you should mention this. I’m concerned about how clean the feed is to his power pole. A dedicated line is definately needed, shielded etc all the way back to its own power plant.