The premium sound in the x3 is lacking bass. As you turn up the volume the highs drown out the lows. There is no harmony between the lows and highs.
Now with my system, I have the gains set up perfect where the lows match the highs perfectly. It sounds great and of course if i want to to it up alil higher to get some thump (as much as possible from a sealed box that is :P ), i can