Dave Merrill
Axe-Master
If they're all from a single vendor, you shouldn't have to worry about it, they'll blend fine, without phasing issues.When I am using two different cabs for example the Vox and M65 and want to blend them, which phase do I need to use?
If you're mixing vendors you'll have to try and see what works best for you in that case.
CAVEAT: I'm less sure about this part:
In general I think MPT files are intended to mix well with others, but some people don't like the sound of them. This is fairly subtle stuff, so of you don't hear problems, don't worry about it.