Originally posted by Diki:
Joe Plumber cannot tell WHY he hears the difference, but he knows 'something' is wrong, or better, or worse.
Until he becomes Joe Sixpack, that is... 
Look, it's a well discussed issue even here at SZ, not exactly brimming with 'golden ear' studio types (of which I am not one, either
). The sound of the Yamaha pianos changes quite considerable between mono and stereo. It gets 'pinched', or 'hollow', or to the more knowledgeable, 'phase-y'.
You don't need a degree in acoustics to HEAR it.
But you might need one to 'excuse' it away... 
YEah I have heard the "don't know why but it's there argument a thousand times in 40 years!! LOL since the vinyl days It's a great rationalization for those who spend $16000 on Speakers too. "That something one cannot explain" I CAN expain it...Imagination. The adjectives when used in audio like sparkle, hollow, phasy? (a new one) make no sense. Tell a monitor sound mixer in a 3000+ seat venue during a sound check you want more "Sparkle" or it sounds "phasy" and watch his face.....I have seen the first example for real....The look is priceless.
Despite the vast expertise on keyboard Arrangers here, I guess i am the only person who advocates mixing for live use done using the Bose LT system (or any System that will be used fpr performanc) Unless the comparison was clearly noticeably inferior, I would put the Phasyish Yamaha mono sound in the category of Yamaha NSMs are not "state of the art" so they cannot possibly create a Platinum worthy mix and or $16,000 BB5s are noticably 8ox better than Paradiams...... or the PA2x sounds better then the Yamaha...or vice-versa...Sound at the levels of these arrangers and the venues they are used in are subjective at best. Specs are not. I don;t care if 12,000 fanatics tell me the Yamaha creates a lesser stereo field unless audience member comes up and says hey man you should have kept that thing in stereo,its way out of phase......I have to take adjectives like "phasy" with a grain of salt. I have heard phase issues first hand, and they are not not subtle. Especially in the Stereo miking world.
Another Bose system at cost would not stretch our budget but we see no need for it and it certainly won't bring anymore work for my wife. There are only 7 days in a week. She chooses to work four.
Besides Stereo in a 6400 SF venue or worse outside, is of no benefit to anyone but the third or less in the very center sweet spot where both driver frequencies tag both their ears at the same time. Much of the time they are dancing or chatting. or doing the Macarena...LOL
Then again the uses a Roland RD and Previa 320 on salty beach or Casino boat gigs. There are mono pianos on the Yamaha gear that would suffice if the problem is that bad,For the most part the average lkistner cannot tell a Fender Rhodes from a Wurlitzer 200....Acoustic pianos would be much harder some REAL and expensive wood and string pianis sound different....
[This message has been edited by Kingfrog (edited 10-19-2008).]