Hello - Can someone please assist me and suggest how to go about upgrading the existing "sound system" of the 2012 Audi TT Coupe - with Audi Navigation Plus MMI system. The car came with a non-bose (unbranded) sound system - of I believe 9 speakers. (The system is just plain and blant and really lacks the "thumping" factor - may be as it doesnt have a sub!)

I dont want to change the HU, but just the speakers - put in a proper sub as well as new amp.

Does anyone have the details / sizes / speaker layout / wiring diagram ?

If more details about the car is needed - I can post it here.

HELP!

Thanks