Richard, the issue 'isn't' about whether a keyboard's piano sample sounds better in stereo, but instead, the mere fact that stereo keyboard samples sent out to a single mono ouput suffer from an audio phenonomon called 'phase cancellation', of which detrimentally alters the quality of the sound ouput. This problem is not specific to the Bose PAS or Yamaha keyboards, but a universal problem that occurs whenever attempting to mix down a stereo keyboard sample to 'any' single mono output speaker.

Richard, though I'll admit that the room acoustics was rather live, the ability to make a direct 'back & forth' A/B comparison between the EV SxA100's and the Bose PAS made it easy for me to immediately hear the distinct difference in sound between these PA systems. I immediately noticed that the acoustic piano voice had much more depth, clarity, and open-ness (transparency) when played thru the SxA100's. Thru the Bose PAS, the piano sounded thin, and missing the smooth depth, richness & open transparency that I experienced through the EVs. Though perhaps experimenting with other EQ settings on the PAS may result in some improvement in offsetting what is the obvious result of phase cancellation, I really doubt that this could actually solve the problem. I suspect the only thing that might be able to accomplish this is the $375 device that Jim Eshleman (the Pro) mentioned earlier on this thread.

Richard, I really appreciate & thank you for everything you've done to make it possible for me to have auditioned your Bose PAS system alongside my EV SxA100 system. I also realize that comparing a mono setup with a stereo setup configuration may not be the best comparison scenerio, but it should also be noted that a 'single' Bose PAS unit is substantially (more than twice) as expensive than even 'two' EV SxA100 PA speakers. Richard, in conclusion, I concur with your statement that "the only one who can determine whether a particular system is right for you, is you". I realize that everyone's music production & performance style, budget, and PA needs differ, so I'm sure the Bose PAS will be an idea choice for many people out there, but just not for me, at least not currently.

Scott