Inner Room design questions

A Healthy New Year to everyone. I am ready to build the inner room-within-a-room and have a couple of design questions. More construction details can be had from my post in the Studio Construction section here Current Situation It is a one room space to be used as a mixing/overdub space. Mostly acoustic, worldbeat and voice. No Led Zepplin drum recording. The exterior dimensions are 29 ft x 20 ft with an open cathedral ceiling having a 14 ft height at the ridge beam. The interior ceiling slopes down at a 60 degree angle to 9 ft high walls. 1. What final interior dimensions/room ratios should I go for? Rod's book lists 6 common ratios used in studios. I want to have as large a space as possible yet stay close to "good" ratios. 2. Half of the space has only one window and this end is where I plan on locating my mixing area. I plan on using 703 type absorption on the walls and corners at this end of the room (and throughout the room as needed). Should I angle my interior walls in up to the window frame (see pix) at this end or just leave them straight and apply trapping. If I angle it to the window the wall splay will be about 11 degrees. I was listening to an AES talk from this past October in San Francisco and the "pundit's" comments were to leave the walls alone and just apply appropriate absorption. Is this enough to make a difference? Or should I just leave it alone and use the trapping/absorption?

Aloha Jeff, And a Happy New Year to you and yours! :D In Rod's book he notes that the orders listed are (top to bottom) the first to third best ratios in both cases. If I understand this correctly, it appears that Louden's third choice will give you the biggest room and still fit your room best (given 9' @ the wall/ceiling junction). It also allows you a decent sized live room. You could then treat your celiings with several cloud absorbers/hangers. (John has mentioned elsewhere that a 12 degree slope will help reduce "ping") L.W. Sepmeyer Height Width Length 1.00 1.14 1.39 9’ x 10'26” x 12’5” 1.00 1.28 1.54 9' x 10'8" x 13' 9" 1.00 1.60 2.33 9' x 14'4" x 20'10" M.M. Louden Height Width Length 1.00 1.40 1.90 9’ x 12’6” x 17’1” 1.00 1.30 1.90 9’ x 11’7” x 17’1” 1.00 1.50 2.10 9’ x 13’5” x 18’9” Perhaps something like this, then? Aloha 8)

Aloha Kendale. Appreciate your comments. I am going for one large Control Room that can also be utilized for overdubs/vocals/small acoustic ensembles. My walls are 9 ft but it is an open cathedral ceiling room with an interior roof pitch of 7/12. The height of my inner ceiling will be about 13 ft so I am guessing an average of "11 ft" to use in calculating the ratios given in Rod's book L.W. Sepmeyer's third ratio comes closest: 1.00 1.60 2.33 11 x 17', 7" x 25', 8" My mix position will be about 38% of the room length-wise and plan on using clouds, 703 based absorbers and diffusion. If I were to plan for a control room and liver room your drawing makes good use of the space.

also consider that if you're doing vox and acoustic recording your control room equipment and activity can create noise, so having a smaller CR and a live room - both acoustically good - might be better than a single large CR. it will depend on your work flow, equipment, and music you record.