Chas,
Glad to see you posting again, and I sincerely hope you quickly recover.
As for the stereo stuff--I guess I've posted this more times than I care to recall, but here goes--one more time.
"The only person that will benefit from stereo is the performer. The audience, especially with the Bose systems, may hear a somewhat fuller sound, but stereo--not a prayer unless they're within a few feet of the performer.
I've tried a pair of Bose systems just to see if there was something I was missing. There was NOT! Beyond 10 to 12 feet in front of the keyboard everything sounded mono to my aging ears. Maybe my hearing is shot to hell, but that's the way it sounded to me.
Cheers,
Gary
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PSR-S950, TC Helicon Harmony-M, Digitech VR, Samson Q7, Sennheiser E855, Custom Console, and lots of other silly stuff!
K+E=W (Knowledge Plus Experience = Wisdom.)