Bill, I suspect that all of the factory authorized demos are not going through a PA system at all, but instead, directly from the line out to a recording device.
As far as sound systems go, I've never really had one that fell short of MY expectations. They all did pretty much what I anticipated, and I really never had a single complaint about any of them. The only reason I've upgraded so many times is strictly because the newer one sounded a bit better and I figured if it sounded better to a deaf old fart like me, it would really sound great to my audiences. I was right.
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.)