Room Frequency Calculator

Shows the number of modes per third up to your chosen limit frequency beginning with the lowest mode.

Room frequency calculator. Dividing the room into the particular number of separate sections is an effective way to calculate the room s precise size when it has a unique shape. The distribution of the modal frequencies should. The program will automaticly calculate resonanses and detect isolated and degenerate modes. It can also calculate the frequency if the wavelength and the medium are known or the speed of sound if its frequency and wavelength are known.

With this calculator you can determine just the right amount of acoustical coverage you ll need to effectively treat your space. A new criterion for the distribution of normal room modes aes journal usa 29 1981. As a default our calculator uses a value of 299 792 458 m s the speed of light propagating in a vacuum. A 10 foot cube shaped room will have a strong inherent resonance near 55 hz which is the open a string on a bass.

Thus one can find the optimal room dimensions for home cinemas control rooms sound studios and exercise rooms. You can also use this tool as a frequency calculator. Calculate the wavelength of a sound wave propagating in sea water from a transducer at a frequency of 50 khz if the speed of sound in salt water is 1530 m s. Minimum coverage will provide adequate acoustical performance while recommended coverage will provide.

According to the bonello criteria this function should be strictly increasing to reach a good distribution of modes. For example if your room has a rectangular shape write down in the calculator only width and depth of it and specify the measure s units. Then treat your room to deal with these frequencies. Basically you are doing a calculation for frequency hertz by dividing the wave speed 1 130 feet per second by the wave length twice the longest dimension of the room.

Plug the numbers in excel or openoffice or something and see where there are some clusters those will be your worst modes. Substitute these values into the wavelength equation λ v f. Choose the velocity of the wave. In this example the wavelength will be equal to 29 98 m.

Peak and dips in the amplitude frequency response curve cause unwanted voice and music coloration. As long as the measurement for the room is done in feet then the calculation automatically cancels out the feet for both the wave speed and the wave length. Ranges are displayed as minimum to recommended. The axial tangential and oblique room modes of rectangular homogeneous rooms are computed axial room modes hit on two facing surfaces tangential room modes hit on four surfaces and oblique room modes include six surfaces crosswise.

The worst type of room shape is a perfect cube say ten feet long ten feet wide and ten feet high because all three dimensions are the same and all three dimensions resonate at the same frequency. Acoustical room calculator for ceilings 13 feet or lower.