The more I research acoustic treatments, the more confused I get. Would you care to comment on what I write below and perhaps try to answer some of the questions I ask along the way? It is a summation/generalization of what I've learned about the subject that may or may not be completely correct. Thanks for reading and assisting. Room Soundproofing I understand that the first step is to soundproof the room as much as possible, and that this is generally done using insulation, soundboard, and a "room-within-a-room" which I believe is two layers of drywall with space in between them. I'm really having trouble understanding how to build the "room-within-a-room". Can someone please explain exactly how this is built? Acoustic Treatments Once the room is adequately soundproofed, then it appears important to put absorptive materials on the front (screen) wall, as well as below ear level on all other walls. Reflective or diffusive materials should be placed above ear level on all walls (except the screen wall). Would someone please tell me what materials they used to accomplish this and is there a way to do it so that it looks "professional"? (i.e. I don't want egg crates exposed in a finished dedicated HT). I'm not averse to DIY sound panels to accomplish this but I am in need of more info on how it's done. Some of the sights I've been to are not instructional enough for this "wanna-be" carpenter. What did you do to treat your room, and how satisfied are you with the results? Thanks!