So im making a color organ using my ipod, speakers, splitter, butterworth filters with gain for three seperate frequencies. I want to have a low, mid, and high but I have no idea what the cutoff frequencies for each should be. I know we hear something like a band of 200 Hz to 20 kHz but im totally not sure at all if that would be reasonable to filter an audio signal to seperate bass, treble, and mid sounds. So my question is what cutoff frequencies should i use to adequately filter bass, mid, and treble with each of the three filters im designing?
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