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.
Wonderful set up. Suggest you taken down the inexpensive foam which only dulls the sound and try even dispersion like the below link. You want sound evenly distributed not killed off. You've already got a rug to help dull reflections. My sound is live but even.
don_chisholm on 