I use a Carvin 2x10 600W combo amp. I want to get more volume for our outdoor stuff. We don't play huge events or anything and my 2x10 has done pretty well, but sometimes I get buried in the mix. I biamped using a 2x15 cab last week and I liked it but I had to borrow a truck to get to the gig! I am inclined to get a 1x12 but I wonder how much it would help? (Obviously, it won't sound like the 2x15). I'm looking at either Avatar or Carvin (my price range) in one of these four configurations: 1x12, 1x15, 2x10 or 4x10 So, portability being a factor but not the only factor, what do you recommend?