I am sorry my response was to delo433. But to answer your question about your cedar lined closet. The real issue is do you own or rent?
There are a few questions I have before I launch into anything.
1. How much do you want to spend to sound proof it? $100, $200, $300, $500?
2. Do the walls of this closet have studs or just cedar nailed to plywood?
3. What is the make up of the closets structure?
If it has stud walls rip out the cedar and replace all walls with two layers of sheetrock and insulation R-19 between. Silicone the whole first layer and mudd the second. Then Auralex foam the interior. First buy 1/8 hard board and cut it to fit the inside of the whole booth. Now use short drywall screws, not many and fasten the hardboard over the finished sheetrock. Now glue the foam to the hardboard. The reason for the hardboard is to remove the foam at a later date if need be for selling the place or new renters. This way you save the foam and the sheetrock by simply pulling out 6 -8 screws in each side of the booth. Ever try to remove foam from sheetrock? Not fun and the sheetrock gets totalled!
Also: Buy a door with a Jamb for $39 and face the back with 1/2 MDF with the door removed. Glue it on with liquid nails. Then face that with foam from the inside of the booth. Put the door on and re-set the door stops back with enough gap for a frost king door jamb set for a tight seal.
Build your jacks and inputs into the wall when you re-do it.
If you want to simply line that wall with sheetrock, glue it on instead and then brace it with 1x1 patterns after another 1/2 layer of MDF so it will not vibrate at vocal frequencies. Fit the foam into the 1X1 patterns.
MDF is higher density than sheetrock and less messy. But if you want to save $$$ sheetrock is the way to go. But spend more on the moister resistant stuff. As far as ventilation you need a plenum design modded to your door that will make your booth the same temp as the room.
Justin from
www.dawbox.com builds door modded plenums for around $250 that will enable you to get air into your booth at the lowest possible noise.
PS. Nothing can replace good mastering and the art and killer gear to do it. I have been trying to master my own stuff for years and it is never right. So get the killer takes at home, in the studio, on the good gear. But when it comes time to print the "Real Copies" get it mastered before you do.
I may be hitting you up for some finishing touches "Massive!"