I have to say that I was wrong when saying in my previous topic that the BobGolds online calculator is not helpful.
However, I would be grateful if somebody could explain me how to interpret the results.
I am mainly interested in reverberation time due to RT60:
RT60 (IEC/AEC N 12-A standard): 264 ms
- ±50ms from 200Hz to 3.5kHz = 214 to 314ms
- ±100ms above 3.5kHz = 164 to 364ms
- <+300ms at 63hz = 564ms
RT60 (ITU/EBU Control Room Recommended): 233 ms
- ±50ms from 200Hz to 4kHz = 183 to 283ms
- <+300ms at 63hz = 533ms
Absorbtion to achieve ITU RT60: 608 sabins
Volume: 81 m^3
RT60 = 0.1611 V/Sa , where V - room volume, Sa - amount of sabins or room surface area x absorption coeff. If V=81, Sa=608; RT must be 0.0214 or 21ms. Comparing to 264 and 233, difference is too significant. What's that? Is there a mistake?
Why there are two different RT60s? What means t1<RT60<t2?
And also about the last 11 lines (apart from the last one):
(sabins - front wall - carpet) / Left+Right+Rear wall: 34 %
(sabins - front wall) / Left+Right+Rear wall: 85 %
What is this percentage about? Amount of sabins to be placed on walls or on floor and ceiling?
Schroeder frequency: 100hz
- No modal boost: 1hz to 27hz
- Room Modes dominate: 27hz to 100hz
- Diffraction and Diffusion dominate: 100hz to 400hz
- Specular reflections and ray accoustics prevail: 400hz to 20000hz
What can be deduced from that?
Count (27.8-179hz) : Axials=13, Tangentials=54, Obliques=72
Count (27.8-100hz) : Axials=6, Tangentials=9, Obliques=2
Does it tell anything important? To my mind, the amount of different types of modes is not so vital..