I could do with some advice on replacing the standard Concert II RDS with an alternative mp3 capable unit. The things that are bugging me are the fact my Audi manual says I have 10 speakers?, and also I found a rear shelf mounted sub-woofer!! I do want to change the head unit so does this mean I have to get a new head unit that can drive 10 speakers including a sub-woofer? I kind of like the Blaupunkt Woodstock DAB 53, mainly due to the facia design and colours, plus the fact you get to use SD memory cards. By the way this is all going in a 2003 2.5 V6 TDi Sport Quattro called Maureen.