Sorry, but lab results ARE on the gig results, but with none of that subjective cr@p thrown in for good measure...

Look, everyone knows you get a certain amount of phase cancellation when you sum things to mono. But how much depends on several factors. How good do the actual stereo samples collapse to mono, and then how good the electronics do the summing.

Yamaha SEEM to have a double whammy, with piano samples and effects that are deliberately (I think) a certain amount out of phase (helps artificially widen the stereo image when heard in stereo - good for the built in speakers), but also, reportedly, poor summing internally. It has been stated many times (and I really have no doubt about the issue), but it WOULD be nice if someone took the few minutes it would take to actually test this out definitively, so we could ALL be aware that you should NEVER hook a PSR up with just the one cord...