Hi Greg!
 > What's an octave?
While I'm fairly sure that you may know what that is, an octave is a
musical expression normally, meaning twice the frequency of the lower
pitch which sounds to the ear as musically the same note an octave
up.Obviously, an octave from an 8kHz pitch would be 16kHz, and an octave
from 50 Hz would be 100 Hz which are not at all the same distance or
range of frequencies, so depending on what your original frequency is,
an octave is twice that or an octave down, half that.
In audio, octaves are usually used to talk about filter rolloffs, such
as in crossover networks, such as a 6dB per octave filter, which should
attenuate 6dB an octave away from the center frequency of the filter
depending on the filter type.
 Bonnie *:>
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