Sorry Scott, the Ty is on it's way to Cajun country !
I refuse to believe that you can't make a good sound, sound BETTER in this Bose PA. Stereo or not ...... it just does a great job. I've used it both ways now and the difference is marginal, at best. It affects ME much more than it does the crowd.

If Yamaha pianos sound that bad in mono, then they are sampled badly. Every mix I do in my studio is A/B compared with Stereo and Mono. With the proper EQ and levels ..... a stereo sample should sound just fine in mono. So far, even at close range, there is no cancellation from the Twin Bose system. It spreads the sound all over and it sounds awesome in every nook and cranny.