I don't understand car audio, so I'd like to ask pros about why people chose to get two subwoofers instead of one. I have one '12 and it provides more than enough bass. If I had two, wouldn't I have more bass than I could use without drowning out the rest of the music? I know this is a common thing to have, but I can't understand why people don't buy one high end sub instead of having two cheaper subs.