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The normal frequency range of hearing for most people extends from <br /> a low frequency of about 20 Hz to a high frequency of 10 ,0100 to 15 ,000 <br /> Hz -- even higher for some particularly keen-eared persons . Most I <br /> octave-band filters now cover the audio range of about 22 Hz to about <br /> 11 , 200 Hz in 9 octave frequency bands . These filters are identified by <br /> their geometric mean frequencies . For instance , the 700- to 11100-Hz <br /> frequency range is called the 1000-Hz octave band . The bands are : <br /> 1 <br /> Octave Frequency Geometric Mean <br /> flange Frequency of Band <br /> (Hz) (Hz) <br /> 22-44 31 <br /> 44-88 63 <br /> 68-175 125 <br /> 175-350 250 <br /> 350-700 500 <br /> 700-1400 1000 <br /> 1400-2800 2000 410 <br /> 2800-5600 4000 <br /> 5600-11,200 8000 <br /> 9 <br /> 11 <br />