As for your subwoofer analogy thats because the sound travels in about the same path,
they are all pointing in one general direction, I am not an expert on this type of thing, dont pretend to be, but do know that more speakers increase the chance of frequency
cancelation.
this is a fundamental tentet of electronics, and is very usefull, dont beleive me, check it out for yourself.
this reminds me of a spat I had with Kex a short while ago, he refused to beleive that higher freqs require more energy to produce than lower ones.
The fact is that a lot of natural law doesnt fit our notions of "common sense",
whoever or whatever created this universe didnt seem to have much concern for the opinions of us puny humans.
For instance, flip a coin , any coin, and suppose that it lands on tails 99 times.
What are the odds that it will land on heads or tails the 100th time?
50% , same as the last 99 times.