I have a single 15 cab and a 4x10 cab (used will be used in conjunction with a 2x10 w/tweeter). I'm trying to figure under what circumstances should I use the 15 or the 4x10. I understand the 15 can handle SLIGHTLY more bottom (about 40Hz v.s. 45Hz for the 4x10) however I hear I can get more "punch" with the 4x10. Either way there are some compromises to be made. I guess I'm looking for one "Set it and forget it" amp and effect setting instead of having to reset every thing based on which low freq. cab I bring to the gig. Thoughts??