I finished my purpose-built two channel room a year ago. You are at the perfect stage to optimize dimensions with shelving and storage.
1. I suggest looking up dimensions obtained by a big simulation, done properly, by the School of Acoustics at Salford University in the UK. Results and a paper in the professional literature are offered for download.
2. Stereophile had a feature article on a case study of a music room, early in 2019. Lot of good ideas there.
3. My own experience with Quietrock 545 and elastomeric glues and caulking from Chemlink was very good. Q 545 is not cheap, but it's solid solid solid - more than an inch thick, two formulations of gypsum plus a layer of sheet steel. As for Chemlink, we used at least 10 cases of the stuff.
My results were excellent. The quality of silence in the room is remarkable - in fact, most visitors remark on it right away. When I want an intimate sound, I sit in the usual listening position. Big bass, in a corner.
Good luck!
1. I suggest looking up dimensions obtained by a big simulation, done properly, by the School of Acoustics at Salford University in the UK. Results and a paper in the professional literature are offered for download.
2. Stereophile had a feature article on a case study of a music room, early in 2019. Lot of good ideas there.
3. My own experience with Quietrock 545 and elastomeric glues and caulking from Chemlink was very good. Q 545 is not cheap, but it's solid solid solid - more than an inch thick, two formulations of gypsum plus a layer of sheet steel. As for Chemlink, we used at least 10 cases of the stuff.
My results were excellent. The quality of silence in the room is remarkable - in fact, most visitors remark on it right away. When I want an intimate sound, I sit in the usual listening position. Big bass, in a corner.
Good luck!