First Attempt at a Control Room

Hello, Below is my first attempt at designing a control room for 5.1 surround sound. I would greatly appreciate any comments or suggestions you might have. My family is designing a cabin in the mountains (which we hope to start building in 1-2 years) and they are allowing me to put a multi-channel control room in the basement. So, I can do almost anything I want so long as it is not too large and not too expensive. I am a mathematician and just do recording as a hobby. So, this room is just for me (and my family) and it doesn't need to be world class anything. I already have two Genelec 8040A and a Genelec 7070A and plan to get three more 8040A (and five in-wall mounting kits, of course). I do not know what any of the other equipment will be. I'm limited to 8'-9' ceilings, so I was planning on covering the ceiling with R-19 insulation (paper up) covered in cloth to act as a mid-high frequency absorber. The side walls are the same as the ceiling. The back wall is my attempt at a low-frequency absorber (perforated plywood, 6" of air space and 6" thick R-19 insulation). The walls where the monitors are mounted will be 1/2" drywall and typical wood framing. The blue lines show the reflections from the front speakers off the back wall. Do you think DIY diffusers would be advisable on that portion of the wall? The floor will be ceramic tile, to match the rest of the basement. I greatly appreciate all your comments and suggestions. Thanks, Douglas

you could put diffusers on the back wall to break it up and/or some absorption to control the reflections. you also need to consider how the back speakers will reflect off the front walls as well... I'd not use paper backed insulation. the side walls can be slat resonators. the rear speaker soffits should be constructed in a similar fashion as the front ones - trapping behind, etc... if you can use 703 or equiv. for absorbers and back wall it will be more effective.