I often see here on TB bass players talking about "no PA support". Why not? I mean I can see if you are lacking channels or just using speakers with 12's in them for vocals, but if you have subs (or at least some 15's) why not run the kick drum and bass guitar through the mains? I would also mic the guitar(s), run keys either mic'd or line out, and probably mic the snare (if nothing else to get a feed for a reverb). I just think having everything running through the PA kind of "unifies" the mix - even if you don't need the volume. Any reason NOT to run everything though the FOH system?