OCTAVE

The interval between two sounds having a basic frequency ratio of two. By extension, the octave is the interval [sic] between any two frequencies having the ratio 2:1. The standard octave bands are:
FREQUENCY (CPS)
Mid-Frequency 63 125 250 500 1000 2000 4000 8000

Approximate Lower 45 90 180 355 710 1400 2800 5600
Frequency
Limits Upper 90 180 355 710 1400 2800 5600 11120