The "music library" is a smallish third-floor room in an old 1920s house. Approx. 15'6" x 10'6" with a sloping ceiling. Recent updates (2020) include a dedicated 20A circuit directly from the panel to the room/gear and newer Shunyata power conditioner (Denali 2000/T) for amplifier.
Nice space. I'd strongly recommend removing the acoustic foam though. It sounds bad. I've been there and someone pointed out the bad news. I did some tests and yes, it distorted the sound. Use GIA panels instead. Or DIY usingĀ Owens Corning 703 (2 inch) - GIK Acoustics