Actually, I WOULD NOT recommend you using 3 layers of sheetrock INSIDE the actual listening room, as the other gentleman suggested!!! you do't want the walls that unforgiving and stiff ideally! if you do put 3 layers, or the likes, you should do it on the OUTSIDE of the room, allowing for the room to have some give (instead of soundig hard and unyielding!), and let bass be naturally absorbed better, and simultaneously keeping sound out/in, etc.!!!
Anyway, i'm sure there's some good ideas that were mentioned here. And, as a custom home theater/room designer/acoustical engineer myself by trade, may I suggest you either get a professional to do the actual design work of the room (too easy to make big mistakes if your serious about your endevor, and a novice at the same time!?), or do lot's and lot's of home work!!!
Still it's hard to attack all the variables, if you don't have experience in to what does what, when you do this and that! Some things help, others make worse!...and so on.
There's no substitute for experience in this case (as many), and you'd do well to get some assistance from someone with the right expertise (my advice anyway)!
Actually, if you did want to get into it the correct way yourself, and wanted to do your own design work on this project, you should try to attend "Russ Hershelman's" work shop in San Francisco next month!!! I think there's still seats available, but the price is $750 (well worth it for what you're going to get, and what your investing in!!!). If you don't know who Russ Hershelman is, he's non other than the top Custom theater/room designer/engineer/ in the world!!!! He designs and egineers for all the biggest clients, and works with the biggest custom theater installers in the biz! Anything to do with designing sound rooms, and he's probably the man to listen to!!! He also runs articles in 3 top magazines (Home Theater, Stereophile's Guide to HT, and AV Interiors I belive (?). He's on going articles in most I think, and his knowledge in these area's is second to none!!(although I like to think I'm close to his league!!!...?). Anyway, best wishes on your endevor! Audioalexander....
Anyway, i'm sure there's some good ideas that were mentioned here. And, as a custom home theater/room designer/acoustical engineer myself by trade, may I suggest you either get a professional to do the actual design work of the room (too easy to make big mistakes if your serious about your endevor, and a novice at the same time!?), or do lot's and lot's of home work!!!
Still it's hard to attack all the variables, if you don't have experience in to what does what, when you do this and that! Some things help, others make worse!...and so on.
There's no substitute for experience in this case (as many), and you'd do well to get some assistance from someone with the right expertise (my advice anyway)!
Actually, if you did want to get into it the correct way yourself, and wanted to do your own design work on this project, you should try to attend "Russ Hershelman's" work shop in San Francisco next month!!! I think there's still seats available, but the price is $750 (well worth it for what you're going to get, and what your investing in!!!). If you don't know who Russ Hershelman is, he's non other than the top Custom theater/room designer/engineer/ in the world!!!! He designs and egineers for all the biggest clients, and works with the biggest custom theater installers in the biz! Anything to do with designing sound rooms, and he's probably the man to listen to!!! He also runs articles in 3 top magazines (Home Theater, Stereophile's Guide to HT, and AV Interiors I belive (?). He's on going articles in most I think, and his knowledge in these area's is second to none!!(although I like to think I'm close to his league!!!...?). Anyway, best wishes on your endevor! Audioalexander....