Now, if I could get you to update your profile with a general location, that would be one less minor headache for me - thanks...As far as doors are concerned, no door that's affordable by normal people will keep up with a decent wall construction. That's why most of the designs you see here have at least two doors between areas of concern. You can get single doors that will give STC of up to about 58, they're made by Overly, and they are "Overly" expensive. Say right around $5,000 per door, give or take a few $...
The best way to handle this is to put in an airlock with two doors, each as well sealed as possible. Somewhere I have info on reasonable door seals (well, almost reasonable, around $2-300 per door, you supply the door)
http://www.acousticalsolutions.com/prod ... l_kits.asp
Found it -
You want solid core exterior doors, they're 1-3/4" thick instead of 1-3/8" thick, and not hollow. The simplest way is to get prehung doors, but if there are any hollow extrusions in the framing they must be filled with caulk or isolation goes bye bye. Probably the surest way to do this is to talk to Acoustical Solutions and find out what kind of doors they recommend for their seal kits, that way you're both on the "same page" -
Remember, door knobs transmit sound. Find a way to leave them out of your design; one way is to put closers on doors, then put a "barn door handle" on one side only, so you don't penetrate the door with either screws or a (gasp) hole.
If you can pour your studio slab as a separate unit, DO IT!!! Flanking noise is the hardest to track down and kill of anything. You can put even 3-4 layers of 30# building felt between the two areas, anything that will break the hard contact. Make sure no concrete bridges this gap. Later you can fill the crack with silicone caulk. You want NOTHING bridging the two areas that is solid, like a continuous board, etc -
Later... Steve