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In Reply to: RE: Before giving up on the big room ... posted by Mick Wolfe on August 18, 2015 at 13:47:56
"his small room isn't that small. It could be very good as well with the help of acoustic treatments."
FWIW, I did a room calculation using
http://www.bobgolds.com/Mode/RoomModes.htm
I got this. I don't have a clue as to what it is saying though.
Computed Information:
Room Dimensions: Length=13.67 ft, Width=11.42 ft, Height=8.17 ft
Room Ratio: 1 : 1.39 : 1.67
R. Walker BBC 1996:
- 1.1w / h < l / h < ((4.5w / h) - 4): Pass
- l < 3h & w < 3h: Pass
- no integer multiple within 5%: Pass
Nearest Known Ratio:
- "21) Origin unknown: meant for small room" 1 : 1.5 : 1.6
RT60 (IEC/AEC N 12-A standard): 217 ms
- ±50ms from 200Hz to 3.5kHz = 167 to 267ms
- ±100ms above 3.5kHz = 117 to 317ms
- <+300ms at 63hz = 517ms
- 300RT60 (ITU/EBU Control Room Recommended): 178 ms
- ±50ms from 200Hz to 4kHz = 128 to 228ms
- <+300ms at 63hz = 478ms
- 200Absorbtion to achieve ITU RT60: 350 sabins
Volume: 1275 ft^3
Surface Area Total: 720 ft^2
Surface Area Floor: 156 ft^2
Surface Area Ceiling+Floor: 312 ft^2
Surface Area Front Wall: 93 ft^2
Surface Area Front and Rear Wall: 186 ft^2
Surface Area Left Wall: 111 ft^2
Surface Area Left and Right Wall: 222 ft^2
Surface Area 4 Walls: 408 ft^2
Surface Area 4 Walls + floor: 564 ft^2
(sabins - front wall - carpet) / Left+Right+Rear wall: 32 %
(sabins - front wall) / Left+Right+Rear wall: 81 %
Schroeder Fc: 132hz
Frequency Regions:
- No modal boost: 1hz to 41hz
- Room Modes dominate: 41hz to 132hz
- Diffraction and Diffusion dominate: 132hz to 528hz
- Specular reflections and ray accoustics prevail: 528hz to 20000hz
Count (41.3-236hz) : Axials=12, Tangentials=47, Obliques=60
Count (41.3-100hz) : Axials=5, Tangentials=4, Obliques=1
Critical Distance (direct = reverberant field): 120ft
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You paid HOW MUCH for that electrical receptacle?!!! Are YOU nuts?
Follow Ups:
This calculator can give an idea but may not represent the reality of the room. It may be more meaningful to do a comparison between rooms to get a better idea. Audible frequencies are divided in to four groups in how they behave in rooms. The RT60 and reflection/ray region is easier to acoustically treat. The modal region is difficult. If you go back to the web page, the column on the left displays the groupings of the modes. The closer together they are the more the more the that frequency will dominate. Enter a room 10x10x10, so its easier to understand. The page will group them together for you. Axial, tangential and oblique are modes that involve two, four and six walls respectively in descending order of strength.
This is reflected in the graph of Bonello's idea of good acoustics:
Thanks for the link and your explanations. I discovered Dennis' videos on Youtube a couple days ago. I hadn't got to this one yet. But he does seem to make it simple in hios presentations.
I realize that the calculators offer theory and that reality often differs, at least slightly. The one part that I took away from the calculator was that the Bonello curve(?) for my room was not that far askew from the ideal...at least to the untrained eye.
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You paid HOW MUCH for that electrical receptacle?!!! Are YOU nuts?
Yeah, that's getting too close to rocket science for me. My hair was starting to hurt. I think you'll find more simple approaches/explanations from GIK or ATS Acoustics. I tuned an 10 x 11 room using very basic acoustic approaches and a lot of trail and error over two years. Basically a combination of absorbing panels and diffraction devices. I knew I wasn't going to get the spacious feel of a larger room, but I have nailed the tone and presence factor. Your room has approx. 44% more volume to work with. Like I tell my friend who has a more spacious room, I think the music sounds every bit as lifelike here( my room)...... it's just the artist plays in a better venue at your place. Of course, the right speaker is an essential part of the small room formula as well. But that's a whole topic in itself.
"Yeah, that's getting too close to rocket science for me. My hair was starting to hurt. "
Yeah. I know what you mean. The biggest help on that site was seeing a graph with the perfect arc. The arc of my room is very much like it but not as smooth. I take it that the room is at least semi close to being good.
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You paid HOW MUCH for that electrical receptacle?!!! Are YOU nuts?
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