I've hear another option is one of the battery back up systems like from golezero etc. as long as the requtifier is noise free it should be a stable power source. Add solar charging to it and your off grid for your audio system. Some youtubers say its an upgrade over standard AC from the power co.
To Battery Or Not To Battery (12 Volt)
https://www.youtube.com/watch?v=4sEvxjdLW-o
Jay's Audio Lab interviews Danny from GR Research about Danny's 12 volt battery power setup. I am not going to pay for a $17,000.00 Stromtank, but the discussed battery arrangement looks more doable though I would prefer it in kit form which Danny just might want to do though the liability costs might be prohibitive.