Off the topic, or is it? Over the years, I’ve been around quite some crazy expensive, dedicated listening rooms in different countries. Best three I would choose as my favourite ones were all treated, not with special acoustical panels, absorbers and other usual high-end audio paraphernalia, they were sourounded by a careful selection of books and vinyls. Yes, I know, shockingly intriguing for some… As a pattern recognition signature, most uber expensive high-end rooms are either absorb or reflect sound too much…
So this might be a good start for some to broaden not only personal book library, improved acoustics, but also the soul searching. And for the prices some companies are charging for “professional” room treatment services, this is an actual bargain…
https://juniperbooks.com/store/100-everymans-literary-classics/