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Octaves: As you know, audio has a bandwidth of 20hz to 20,000hz. It can also be said that it has a bandwidth of 10 octaves. An octave does not have a predetermined value. A change in frequency of a multiple of 2, means a change of one octave. An octave has to have a starting point. If the starting point is 1000hz, one octave up is 2000hz. One octave down from 1000hz is 500hz. Equalizers commonly have one octave spacing between their slider controls.

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