Keep it simple they say, but they also say form follows function. Here is my dilemma, I live in Alaska and first bought a set of large vintage PA speakers, then I found another pair and stacked them on the first set. I have recently been hearing that this is a bad idea, that the using of multiple speakers degrades the sound quality. One of my friends who said this does not even care if his speaker cables are the same length! I found your site because I looked up comb filtering trying to figure out what the objection is. Any insight would be appreciated!