Basic Shape and dimension design of studio in SF CA

Hi this is jordan from San Francisco CA. Thanks to you all for putting together and contributing this awesome forum. I've already found a ton of great information here and I know that my studio and thus my mixes will sound way better because of it. I'm currently about to embark on building a mix room for mixing and mastering bass heavy electronic music, doing post production work and other general mixing of other pre-recorded sessions. Basically our studio will be a mix room only without a tracking area. We're trying to create as sonically balanced a room as possible (obviously), but we especially want even bass response. any advice would be greatly appreciated. Here is a google sketch up of the basic shape design of the room. The side walls are each pitched out 6 degrees creating a combined 12 degrees off parallel with each other. The back walls are pitched out 15 degrees The Tentative mix position is marked by the the triangle in the middle for the floor. I chose this because it is 38% of the rooms distance from the back wall behind the speakers. The speaker placement is not defined or set as the placement that we will exist. The points defining the placement of the speakers are as follows: - I made a equilateral triangle based on being 38% of the way from the front wall. That way I no matter where on the line i place the speakers they remain at a 60 degree angle and equidistant from the mix position. My plan Is to turn the whole back wall in to a sort of tuned multi frequency bass trap. The Idea is to analyze the room and find the main offending fq's. then using the 1/4 trap design, make a wall that has different thicknesses of semi rigid foam isolation, carefully placed at depths equal to 1/4th the wave lengths of the the offending fq's. The more of a problem the FQ is the more insulation I would use at that depth. I'm hoping that this will allow me suck up any bass build up, but do it methodically as to create a balanced bass response. I was thinking I would base the amount of foam I use at a a specific depth based on the amount of bass buildup i get at the corresponding FQ and the rated attenuation of the material I use. I will probably slightly under attenuate at each depth because all the FQ will experience some attenuation at every piece of foam it passes. What do you guys think? Is this a misguided approach ? Besides the the things that i don't know that I don't know, here are some of the things I'm not so sure about are: -How will this affect my position at 38% from the front wall? -How would I use this to deal with dips in the rooms FQ response resulting from standing waves. -Would I treat it just like bass build up and make a 1/4 trap in my wall based on the amount of cancellation I get. Unfortunately we're working with a small amount of space, and will be producing a lot of low-end. Do you think this will work? Or is it totally the wrong way of going about it? If so whats the right way? any advice is much appreciated. The other part of our design so far is the roof. if you look at the google sketch up the two different design ideas for the roof are behind the studio. Unfortunately there is a 12"x19" concrete beam running length wise directly in the center of our room. Its unfortunate but unavoidable. the two sides of the beam would be treated Identically but i left one side open so people could see the basics of what were working with. the two different basic Ideas are either build in a 12 degree pitch from front to back with the low point in the front of the room, or to create a saw tooth type of ceiling. I'm not sure what one will work better but I'm leaning toward the saw tooth because i think it will be easier to build and doesn't eat into the amount of air space in the room as much. thanks for reading my ramblings, I'm a pretty new to all of this. Any advice would be greatly appreciated ! thanks Jordan Machardy

Hi, Could you produce some pictures of the floor layout of the existing location? I'm not in love with the back wall breaking in the center, essentially making a potential buildup area, flat would be better with modified treatments that project into the room would be more to my liking.

also, not all frequency issues can be resolved on the back wall... do you have the raw floor plan plus as Brien noted some photos?

Hi Guys, thanks for the reply. Basically what were working with is a 12' 6" x 16' rectangle thats 9' 2" tall of raw space in a basement of a large building. the good news is that we can really build the room what ever shape we want. the bad news is that it has to fit in to those dimensions. Also theres a big nasty concrete beam (12" wide 19" deep) that runs the length of the 16' dimension of the roof. I don't have any pictures off hand but I'll try to get some out soon. I definitely agree that we'll have to do more treating of the room than just the front wall ( the one you'd be looking at if your mixing. I never know what wall to call what). The Idea was to make bass traps on the front wall and a bunch of defusers on the back wall. Than also treat the side walls with some panels to cut down the early reflections, and also here and there based on what our room analysis tells us we need. Thanks again for the replies !!! I'll get some pictures out soon. Jordan Machardy