If you have to put 12 speakers in your car to get decent sound, then you might be using the wrong speakers.
This is the checkbox mentality. Unfortunately, many folks purchase items using a checkbox count, with the more boxes checked the better the product must be--regardless of the quality of each checkbox item. The end result is bloated products and bloated prices (and it's far too easy to fall into the checkbox mentality--I'm guilt of it myself).