dedicated power receptacles for mono blocks?

I'm guessing it makes no difference, but with dedicated outlets feeding mono blocks, that is one dedicated outlet for amp 1 and 1 dedicated outlet for amp 2, does it make a difference if you are on the same panel phase? Perhaps if you are on opposite phases you could have a ground loop? Or, would the amps be "in-sync" if on the same phase and "out of sync" on the opposite phase? Perhaps it is no different than if you had the 120 volt selector switch on an amp (assuming you had that switch) set to 240 volt.

I don't have mono blocks nor do I plan on getting any, the thought just popped into my head and I thought I'd ask. And forgive me if the question isn't exactly making sense. I'm not an electrical engineer or electrician! Just hoping you kind of get what I'm getting at.