Absolutely, he is a pioneering legend to say the very least. I have read that 500ms for music listening space and 300ms for dedicated home theater. I built a dedicated home theater room about 10 years ago totally treated, 300ms decay time for the most part. The room sounded great with movie, horrible with music. It is very easy to go too far with absorption and take the life out of the room. I am aiming for a 500ms decay rate across the board as best I can at lower frequencies. I'm going to try the "live end", "dead end" approach. Using almost full diffusion on the front wall with the exception of the full height corner passive bass traps. Diffusion clouds on the ceiling. I am on the fence about using abbfusors style QRD's or standard QRD's on the ceiling ? I need to take some energy off the ceiling for sure and back scatter it downward, I think the abbfusors would be ideal for this.