Would you still use cab modeling then ? More so, do you turn off power amp modeling and then run through the cab block, before going into your tube power amp ?
Bypassing the power amp and the cab block and running into a tube power amp and guitar cab works well, and plenty of people do it, but running a tube power amp into a FRFR speaker with no cab modeling would sound pretty poor I'd have to think.
Maybe something like a XiTone with the option to turn off the tweater, but a FRFR playback system just isn't going to give the tonal coloration of a traditional guitar speaker.
Turning off the cab block (and not using a TM block) and going into my floor or studio monitors sounds awful to me. A tube power amp in the chain wouldn't really fix that.
Don't get me wrong, more power to anyone who wants to run their rig however they want, but I'm just trying to wrap my head around the logic of a power amp modeling turned off when using a FRFR system