Good point Diki, one I didn't think of. And a very valid one too I will add. I sometimes make the mistake of assuming everyone knows the same stuff, which of course they don't.
So no m8, it's all good here. You were correct to pull that one up.

As for why Yamaha do it, I suspect you are right, in that it allows them to more closely regulate various sales regions.

Why they then ALLOW this to happen with their pro gear could be that the pro gear has much much more competition and if they restricted the power supplies they would lose sales to other manufacturers.

And Bill, in my experience (and I was also advised this by an electrician) a switching power supply and a universal power supply are one and the same thing.

I should have said in my earlier post, a Universal Switching Power supply, just to make it clear.

I believe they all are actually full 250voltAC(the maximum in any country) supplies, with filters controlled by the switches that regulate how much current is allowed to pass onto the DC output stage.

However, I am always open to learning new things, and if you have evidence to the contrary I'll be the first to say I was mistaken.

Cheers
Dennis