I have factory fitted Bose system but I'm considering upgrading it. I have read so many different things, like the system filters out bass at higher volume etc.
Has anyone upgraded to an after market system including amp and sub? Of so what's out there?
Any advice welcome





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2006 RS4 Avant (Phantom Black), RNS-E (2010 version inc SDS, HW 070, SW 0200) with AMI (250GB hard disk), Bluetooth + HTC Touch HD


