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Shows the tune of the selected mode, just like a guitar tuner. The hand indicates the 'exact' tune in cent (100 cent are 1 half tone).

The so called "Bolt-area" indicates a accumulation of good room ratios. If the red cross lies within this area you have a good chance of more evenly distributed modes.

sources:

- Bolt R.H.: "Spatial Resonance and Standing Wave Patterns in Small Models of Various Shapes", JASA 10 (1939)
- Bolt R.H.: "Frequency Distribution of Eigentones in a Three-Dimensional Continuum", JASA 10 (1939)
- Bolt R.H.: "Normal Modes of Vibration in Room Acoustics: Angular Distribution Theory", JASA 11 (1939)
- Bolt R.H.: "Angular Distribution of Normal Modes", JASA 11 (1939)

Shows the number of modes per third up to your chosen limit-frequency, beginning with the lowest mode. According to the "Bonello-criteria" this function should be strictly increasing to reach a good distribution of modes.

sources:

- Bonello, Oscar J.: "A New Criterion for the Distribution of Normal Room Modes" - AES-Journal(USA) 29 (1981)\n\n\
- Bonello, Oscar J.: "Acoustical evaluation and control of normal room modes" - JASA 66 (1979)

Displays the room in 3D. Select a mode above to see its pressure zones.

Volume:

Surface:

RT60: sec

Schroederfrequency:

Critical distance:

Sabine | Eyring | |
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Equivalent absorption area needed: | ||

Average absorption coefficient needed: |

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You can

- start the calculation anyway
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- room dimension
- reverberation time
- lower/upper limit frequency for calculation