<This is funny - I'm an electrical engineering student, and I've taken several classes about circuits that operate at audio frequencies. My brain is now starting to figure out how to actually design this thing, heh.>
"Cool! I'll do a search to find the right frequency range, I'm sure that the journals already have plenty of research on what makes people cringe and all that... then I can work on designing the filters based on that..."
And so the research commences.