Our centers and surrounds - always on. The M80s - 50/50. We keep them on for parties, off for 'audio friends'. The EP600 - we can't bring ourselves to put the grilles on. It's just mesmerizing to watch the woofer during music. Maybe we should tell Microsoft about it and they could add it to the skin options for Windows media player! My fave is the Yo-Yo Ma / Bobby McFerrin collaboration - the woofer is amazing during some of the runs.