I'm no audiophile when it comes to car stereo but my system sounds great to me. I am old but I still love lots of bass. Always have. Maybe it's why my hearing is going away.
As for the Sony Xplods, I have two 12's (my setup in the links posted by C-10volvo) and love them. I'm sure there's better ones out there but to me, they are perfect. They provide all the bass I would ever want to hear in a pickup.