Not sure of the differences between regular and XPseries, but I gigged a MarkVI xp series that I bought new for
17-20+? years @2.67ohms with Peavey 4x10-8ohm and 1x18-4ohm cabs that were even older.
If you run it at 2ohms I think it pushes 400watts.
It's very loud and very heavy and I never had one single problem with it in all that time.
It's a dependable head, I have a Mesa M6 now but I'm keeping the Peavey Mark VI XPseries for a back up,
I can't let it go after all those years of dependable service.
Here's a couple of old pics of mine.
