So I figured, why not use a computer program to process and filter the audio and then tell the arduino to output each band.
...outputting 5 signals simultaneously given to it over USB?
Looking it, up I can find some equations for deciding on the components. So all that said, yer pretty much just saying that i start with my original signal, split it into a low-passed and a high-passed, Send the low to an amp/speaker and send the high to the next set of filters and then repeat until I get my number of speakers? Really it seems simple, just a matter of getting design well down.