The old, OLD, "Sweet 16" speaker project from Popular Electronics used 16 cheap 5" speakers on each side (but just one box per side), the theory being that crummy speakers driven very little together might produce good sound. My personal opinion is that Bose stole this idea and made a mint. I agree with the posts that say try different speakers, not two pair of the same. Let them 'average out' the sound. Plus the greater power capacity you get with more speakers. Don't spend big bucks, experiment first. I think what will suffer, from what I've heard using multiple speakers, is imaging. Good luck!