Those Mackies would still have sounded lousy when compared with the Bose L1. The L/R composite output from the board is not a true combination of the left and right output combined, but instead an electonic hybrid, at least that's what Yamaha's tech guy explained to me. You still made a good choice with the Bose L1 and you're not going to regret selling the Mackies--at least from my perspective.

You know, of course, that you can take both the keyboard's left and right outputs and hook them up to separate inputs on the amp and achieve wonderful quality. Many of us do this when playing small venue jobs where two speakers are not required.

Good Luck,

Gary