Room acoustics basics

I used the book Master Handbook of Acoustics. Loads of great information.

agree with @willy-t  on Jim Smith's "Get Better Sound".  Much of his very understandable non-STEMmy book focuses on room acoustics and how the room is the #1 component in your system.  Worth the purchase--helped me a great deal.

Check out some Ethan Winer YouTube videos.