Jaguar XK 2010 - Audio System - The audio system seems to no longer have any "Bass". I have adjusted the controls to full Bass, and reduced the Treble to zero, but it still sounds like there is no Bass coming from any of the speakers (Bowers & Wilkins), front or back.

 

You have a subwoofer, sounds like that is out, either the speaker or the amp. I have never searched out the location but it sounds like it is under the dash.

 

Sub is in the passenger footwell.