Morphosis
Official G66 Support
If I continue to use the Mesa cabs or get one of the other speaker solutions I still have to get the FOH right. I have a pair of M-Audio BX 8"s but I'm not confident getting a tone with those will translate well.
If you are happy with your Monitor sound as it is (20/20, pair of 1x12 Mesa Cabs) and just want a system, which you can trust (in fact: monitoring) that it will respond also well at FOH direct ...
... the classical way would be: FOH-Engineer will mic up (both) of your cabs. The same result could be achieved by capturing your own IRs of THIS Soundsystem and use those Cab IRs for direct out to FOH in future, side by side monitoring at stage through the "real thing".
Advantage:
1) You can use the stuff you have and like.
2) You monitor sound and feel stays as it is - CLR, Matrix, etc: Yeah: all good stuff, but it is a paradigm change and it affects the "feel". It`s for many people - but not for all! Perhaps you are one of them - who knows.
3) IR capture of the own guitar-cabs would be equal to "mic up" on stage - but with the diffewrence of having time to find the right mics, sweetspots, best personal preferences what sound you`re looking for ... Capturing routing in this case should be: Axe-Fx -> 20/20 -> MesaCab -> Mic. this will guarantee to capture also sound influences frequency wise of the 20/20 as well - what in fact make sense in this case.
I would try this route. Trying out different Mics and / positions (or the simple way: Place the usual FOH mic [SM57?] the same way your Engenieer will do in common - control the result with your BX 8"`s - and if it sounds good there, it should be fine! The rest is up to FOH guy - as it ever was since Amps were miced up on stages ...
Just my 2 cents ...