Fellow TBers, I want to add a 2nd cab to an Avatar 15 (no horn) and I was weighing the pros and cons of getting a 2x10 or a 4x10 and.... ...why not get another 15 instead? Do I need the higher freq response of 10" speakers? I could get a 15 with a horn but is that even necessary... Can anyone compare 2 15"s vs. 1 15" + 210/410 setups in gigs without PA support? Would I get more volume with the 410 or 210 because there is more speaker surface? Thanks guys.