Been lurking around the forum for some time now, and I have to say thanks for all the info that has helped me and some other dudes I know in building our studios..
I have a few questions concerning treatment for our control room..
Some room info..
Our studio is locating in the second floor on an office/store building in N. Miami Beach, FL. The units around us are just offices, and a cafeteria right down stairs. The unit itself is a store front with big glass windows and glass front door. The way the room will be set up is the vocal booth/live room with be all the way at the front with double wall construction for noise isolation if needed (local traffic very minor, barely non, just visitors to the area and a few homes around us like a block away or so)
The studio it self will have the vocal booth at the front of the unit, the windows will be completely covered by the walls that are/have been built and the control room will follow after.
The control room dimensions are 13' 4" LENGTH, 11' 2" WIDTH, 10' HEIGHT..
The actual construction is based on some of the posts/tips seen here.
-2x4 wall studs filled with a mix of rockwool and rigid, dense pink insulation (R-30)
-2x6 ceiling studs with rockwool and pink insulation
-2 layers of drywall, 3/4 & 5/8's all around the room including ceiling
-Backer rod and mud used to seal all the edges around the room
-Flooring will be all wood floor on concrete (floor is not floated, isolation in the unit is good, we are on the 2nd floor in the building, offices on either side of our unit that close earlier than when we open, as well as unit construction is all cement brick construction which before construction we tested playing music and we were running at really low levels before construction.)
A/C unit is behind the building in the 1st floor so no rumble from a/c unit
Very to little local traffic, specially at night.
No noisy neighbors at night.
Now the sizes of the rooms came from a previous owner that was building there previously, and the framing was already up, so we thought that the room sizes were perfect, so we built from that keeping the 10' high ceilings and the actual control room dimensions.
Based on some info regarding the modes and the size of the room, this is what I found using Bob Golds Room mode calculator..
Room Dimensions: Length=13.33 ft, Width=11.17 ft, Height=10 ft
Room Ratio: 1 : 1.11 : 1.33
R. Walker BBC 1996:
- 1.1w / h < l / h < ((4.5w / h) - 4): Fail
- l < 3h & w < 3h: Pass
- no integer multiple within 5%: Pass
Nearest Known Ratio:
- "2) L. W. Sepmeyer: 1965" 1 : 1.14 : 1.39
RT60 (IEC/AEC N 12-A standard): 214 ms
- ±50ms from 200Hz to 3.5kHz = 164 to 264ms
- ±100ms above 3.5kHz = 114 to 314ms
- <+300ms at 63hz = 514ms
- 300<RT60<600ms
RT60 (ITU/EBU Control Room Recommended): 187 ms
- ±50ms from 200Hz to 4kHz = 137 to 237ms
- <+300ms at 63hz = 487ms
- 200<RT60<400ms
Absorbtion to achieve ITU RT60: 389 sabins
Volume: 1488 ft^3
Surface Area Total: 784 ft^2
Surface Area Floor: 148 ft^2
Surface Area Ceiling+Floor: 296 ft^2
Surface Area Front Wall: 111 ft^2
Surface Area Front and Rear Wall: 222 ft^2
Surface Area Left Wall: 133 ft^2
Surface Area Left and Right Wall: 266 ft^2
Surface Area 4 Walls: 488 ft^2
Surface Area 4 Walls + floor: 636 ft^2
(sabins - front wall - carpet) / Left+Right+Rear wall: 34 %
(sabins - front wall) / Left+Right+Rear wall: 73 %
Schroeder Fc: 126hz
Frequency Regions:
- No modal boost: 1hz to 42hz
- Room Modes dominate: 42hz to 126hz
- Diffraction and Diffusion dominate: 126hz to 504hz
- Specular reflections and ray accoustics prevail: 504hz to 20000hz
Count (42.3-224hz) : Axials=12, Tangentials=47, Obliques=60
Count (42.3-100hz) : Axials=4, Tangentials=4, Obliques=1
Critical Distance (direct = reverberant field): 12.80ft
I'm
after reading this cause this is confusing to me.. I know that in the control room, first reflections needed to be treated first as side walls and cloud around and above mixing position, but the confusion comes for the front and rear walls of the control room.Our window is not exactly in the middle of the room per say, based that it was placed in the middle of the booth/live room (its smaller in width) so the front corners aren't the same size.
What advise do you guys give for such a room like this. I have attached a simple (really simple) floor plan design of the control room showing the location of the window between both rooms as well as the door and what our first reflection treatment will look like..
Also what other types of treatment such as bass traps in the corners or diffusion is needed in this type of room. I know diffusion is based on room size, so is recommended for this type of room and what do you guys recommend for the corners around the window and bass traps for the back room..
I've attached the drawings, sketchup file and a few pictures of the location at the moment..
Thanks guys for all your tips and advice, I appreciate them..
