![]() In the fourth zone, sounds behave like rays of light bouncing around the room.The third region which extends approximately 2 octaves is a transition to the fourth zone.This transition frequency is popularly known as the Schroeder frequency, or the cross-over frequency and it differentiates the low frequencies which creates standing waves within small rooms from the mid and high frequencies. Above that zone, until wavelengths are comparable to the dimensions of the room, room resonances dominate.In this zone, sound behaves very much like changes in static air pressure. The first zone is below the frequency that has a wavelength of twice the longest length of the room.The way that sound behaves in a room can be broken up into roughly four different frequency zones: Instead of trying to correct Toole I suggest this reading from Wiki to him: What he also fails to understand is that Schroeder frequency of his small room is likely around 300Hz, not at 80Hz. After Schroeder frequency they will start to fade as room response is no longer dominated by resonances. If you have a mode at 73Hz you will also have a 2nd mode at 146Hz, 3rd mode at 219Hz and 4th mode at 292Hz. ![]() What Tangband fails to understand is that resonator modes don't magically stop at 80Hz.
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