Mine's not that bad. I don't really crank it like the kids do these days. I like my hearing. ;-) If you want clear bass I think you'll need at least 400W into two 10" or one 12". I wouldn't go with a 15" though.

What I'm now planning is to install tactile transducers, such as Aurasound's bass shaker Pro, under the front seats. I'm a drummer so I need to feel the kick, and that should do it.