I can't see that working well. Headphones are easy because the only place you need to get destructive interference is fixed relative to the speakers in the cans; for stand alone speakers you'd end up with the interfering waves ending up in an out of phase making both quiet and extra loud spots. :doh:
Did you ever see history portrayed as an old man with a wise brow and pulseless heart, waging all things in the balance of reason? Is not rather the genius of history like an eternal, imploring maiden, full of fire, with a burning heart and flaming soul, humanly warm and humanly beautiful? --Zachris Topelius Training a telescope on one’s own belly button will only reveal lint. You like that? You go right on staring at it. I prefer looking at galaxies. -- Sarah Hoyt