Hi yer Johnny
My advise is to get rid of that Audi rubbish in your car especially the speakers they are 2 ohmn Chinese rubbish no matter what they say on the front mine where supposed to be Bose when I took them out they were actually Blaupunkt and made in china was printed on the magnet so some Chinese company brought the rights to Blaupunkt name when Bosch sold the brand name
My advise would be Hertz HCX-165 front and back and change your front tweeters but I don't know your budget for the fronts you may have to get MDF rings made I had to in my 05 A4 ds Simon
Regard's Simon