Inner Leaf Ceiling Angle......or not???

Hey All, Got the floor floated last night. Progress on the studio is going great. We have the outter leaf built: 1/2" rock 5/8" rock Frame with 3" Rockwool 8" Air Gap Floated loor Built. i am building inner leaf frame on Monday. I have been planning to angle ceiling from 9' at mix position to 11' at rear of room. I was wondering.... Can I leave the ceiling at 11' across, then come back and angle a fake (703/fabric) ceiling. This would give me that 24" - 2" for bass trapping across the ceiling in the angle. i think i know the answer, thats why my plans call for angling the real ceiling so I have no paralle walls (ceiling/Floor) I have added a diagram for clarification. The blue line would be the change i want to do, the Red/Maginta line is what the plan calls for now. Thanks for all the help, jai www.themixstudio.com

Part of this would depend on whether your outer ceiling is already a mass-air-mass barrier, so that you have isolation under control. If that is the case, then your inner sloped ceiling can be whatever you decide. Making traps part of the sound isolation will weaken the sound isolation at the working frequencies of the traps ( it's gotta go SOMEWHERE) Putting 703 at an angle does NOT change the effect of parallel walls except at higher frequencies, so you would still have some of the problems of standing waves. What you CAN do, is build a SOLID sloped ceiling but leave a couple feet open at the front of the room (where the bass pressure will be highest) and fill the entire ceiling cavity with spun fiberglas, then close off that two foot wide strip (across the entire front of the ceiling) with thick 703 (at least two inches) - don't restrict the spun glass from contact with the inner ceiling wallboard, you want it damped. Once this is finished, you want to check with a mirror against the ceiling to be sure there isn't a spot where you can see either speaker in the mirror from the mix positions - hanging a 703 "cloud" over the mix area will fix that too. Same check with walls, absorb any spot where you can see a speaker reflected, then stop and listen. Any more treatment only if it's too live, or uneven reverb response (ringing at specific frequencies, etc) Hope that helped... Steve

Good to hear you're underway! How deep are the ceiling joists you're planning to use? Is there any way you can drywall or deck the top of them instead of the bottom? I forget how much headroom you say you have up there, but you'd need enough to get plywood sheets up there (unless you cut them apart for handling, which aside from needing more caulk may not be a bad idea). If the ceiling is going to slope up by 2', you may not have much trouble getting sheets up on the low end, and just sliding them up to the top. If you can do it this way, you would have the sealed room, but the joist space inside with which to hang bass trapping. And the whole thing would be sloped, both the decking above and the absorption below. It'd be a bigger pain to build, but if you can do it, it'd accomplish what you're trying to do pretty cleanly. Kase www.minemusic.net

Cool. I thought that ya'll would say that. i have the plans calling for a slope, but was trying to add a bit more trapping. I already have a 36" deep, 11' high x 18' wide trap in the back of the room covered with a custom defussor. (Pix Soon) Plus the trapping in the front of the room behind the sofits. Sooooooo..... I guess i'll stick with the plan. That seems smart. :D Work is moving very fast. In Three days we have ripped out everything except restroom, Built the outter leaf (1/2" rock, 5/8" rock, MDF, stud, Rockwool 3") all built on 2x4 frame, Floated the floor in Control A, Tracking A, and Iso A. We have gotten so much done so fast that we have run about out of plan. I am working as fast as I can to get the HVAC and Electrical plan together for Monday. I hope to get pix back today so I will post the progress as soon as I get them. Thanks for all the help, jai www.themixstudio.com