@chakster
https://youtube.com/watch?v=f5tS2ikuuro&feature=share
(glass) is pure evil for room acoustic and must be covered if possible by absorbers or diffusers.You missing the whole point. Acoustic reflection process is pure physics and implementation of it into the listening room setup, where the goal is full Spectrum music SQ (some time customised depends on genre or personal preference), is balanced process and not always dogmatic but compromised. Some flows of sound Spectrum you want to be reflected other not, that why all those room acoustic analysis services are silly. If you just try to break your sound flow with diffusers and rugged walls to as smallest particles you can, you wrong cause you will get nothing but dull woolly sound. Check it out how glass or sleek surface could be implemented-
https://youtube.com/watch?v=f5tS2ikuuro&feature=share