being a psychology major, I am uniquely (not that much so) qualified to answer this question.
freud would have a heyday with this one, but it is coming to pass in the realm of psychology that freud is bunk and empiricism (thank god) is taking over.
this is my theory:
bass and high end car audio, believe it or not is a byproduct of evolution. Men have certain traits that give them a reproductive advantage. A while ago, simply strong men stopped having an advantage and smarter ones started to get an advantage. There is a certain bodily health requisite it appears, that women need, but what caused men to make the most babies in societies that have rudimentary culture and civilization is intelligence. Evolutionarily, women will select and hold a mate that will provide them with the most security and food. What sort of man can provide security and food? A strong one? sure, but only to a certain degree. There are other factors that can provide much security and food that the evolutionarily driven woman desires. Men, are statistically better at tasks requiring spatial perception. This isn't a mistake, because spacial perception will cause men to hunt better, think and strategize about the catch of animals and devising and creating tools in which to provide more food, more safety, beat down other competing men and make weapons to do all of the above. Spatial perception coupled with planning ability which will help all of the above provides for some excellent traits in humans in general. This basically is the heart and soul of engineering, spacial perception and planning.
Car audio is a man's wet dream because it is so complicated and requires so many of the traits that evolution has come to give us. it seems that since evolution has given us spacial ability and planning, we are also compelled to use it. Add in our natural tendancy to compete (get the women, beat down other men through force or status) and the formula for car audio competition and high end equipment is born. But, all of this does indeed boil down to ***, because in our evolution, it was women who has driven us to have a genetic inclination toward spatial perception and planning, and it was our desire for *** that caused the frequency of these traits to propogate in the human gene pool.
it's 5:54 am and I haven't slept, so I'm not extremely eloquent or articulate in my explantion, but the nuts and bolts are there. If you have any questions or comments, I would be most pleased to answer, clarify or outright flame you if you're wrong.