Neurop
Building a room as we speak. Couple of thoughts. Get the room dimensions as ideal as practical. Your challenge will always be bass management and keeping your noise away from the rest of the home. High ceiling is preferred. Generally speaking, steel joists are preferred over wood. 24” OC better than 16”.
For not much additional cost, frame room with 8, 10, or even 12” studs and plan to incorporate, integrate, bass traps into the walls, ceiling, floor etc to keep your room open as real estate is expensive. You will thank yourself later on. Bass management is one of most expensive elements to do correctly. Everyone’s advice is spot on from mass loaded vinyl, to double 5/8 gypsum, double walls if possible. Also, your weak link will be your windows. Tuff WAF, but best not to have any, especially at the listening level. Windows with STF’s above 50 will cost you. Door(s), 2 solid core doors separated by an air lock. Affordable. Try and float the floor with a sound absorbing mat, 2 layers of 3/4 ply and some green glue or similar in between if not on concrete. Don’t allow wall and floors to touch. Seperate by 1/8 to 1/4” and fill in with acoustical calk. Plug ALL penetrations (no jokes please), especially outlets with putty pads or similar. More details on line. Best.
