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Date: 11/22/99
Posted by: Norman McLeod
E-mail: normac(at)fastnet(dot)co(dot)uk(no spam)
URL: http://

I am investigating the design of RC audio filters for splitting audio into three bands (below 150Hz, 150Hz-850Hz and above 850 Hz, for subsequent level control and recombination. In the past I have used third-order Butterworth filters, four in all, with the mid band section inverted before sunmmimg. This is because the Butterworth filter has about 90 degrees lag or lead at the turnover frequency. Is there a better way of doing this which is either (a) more economical in components or (b) with better amplitude response when summed?

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