I have a 2010 TDV8 with the Premium Audio (HK Logic 7 System) and to be quite honest it is very average in terms of sound quality even when playing CD's.

Is the problem the speakers or just the whole system.

I will be keeping the vehicle for at least the next 12-24 months (only 18,000 km on the clock - can't justify to the finance minister to change).

What can I do to improv ethe system?

Have you tried adjusting the sound within the menu's?.... mine sounds great!  MY2007 RRS TDV8 Black - tinted glass - side steps- stormer grille - 20" diamond cut alloys - alpaca leather - TV/DVD pack - some blingy chrome bits & bob's

I'm not too impressed with the logic 7 either. the sub rattles a lot.

its not the sub its the trim around it

I have the Logic 7 and it's one of the best in car I've heard to date. My mate recons if you fit a jL sub in place of the standard item it really sounds the dogs dangles.  MY 11 RRS Luxury Stornoway Grey Ivory/Black leather contrast stitching Logic7 side steps roof DVD system for the grand daughter. Mercedes SL500 for the summer. Vito Sport X for work. Gone to many to list but what larks