So, you only have to lurk around TB for a few minutes to hear a lot of well-reasoned arguing for why mixing driver sizes is bad; I'm not here to dispute that. I saw a thread recently asking why this doesn't apply to fEarfuls and the like, and the answer was that the their crossovers fix it; makes sense. So, my question is, why doesn't the 'typical' 4x10 + 1x15 setup have a crossover in the 15? Crossovers are cheap are hell. In fact, why isn't the 15 an LF even, maybe? I have (and love!) a fEarful stack, so I don't need to be converted here, but why is this a new way of doing things? Like, if the luminaries Talkbass can figure this out, why not major manufacturers? Please, explain why my question is asinine below!