Hello, I’ve installed the 603 in my V70 /2002er, I find the sound really bad because just the bass is missing. Probably I’m rather envious of my brother-in-law because his V70 /2007er a much hornier sound comes out as more bass pressure. We both have the normal sound equipment, so no Bose/Dynaudio or special systems integrated! I searched for the subwoofer and found nothing (back in the trunk bunker under the carpet, was at least nothing) I wonder now if is it really on the radio, whether the preamp is better or are the speakers just better?