I was just advised the other day that BUY.COM has the YST-MS50 amplified speakers/subwoofer (80 WATTS total) for $39 (YES, THIRTY NINE DOLLARS !!!!!!!!). I just bought two more sets !!! This is a totally amazing deal. These are basically the same speakers that Tyros uses, at 1/4 the price! These are YAMAHA speakers, not some cheapo bargain basement units. FOUR of these (two units), one aimed at you for monitoring, and the other aimed at an audience, would work for all but an auditorium setting.