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in order for 6 3/4" to fit they must be shallow mount. the actual size is 6 1/2" speakers whether or not you have the infinity system. im not really a big fan of blaupunkt myself. mb quart's are my fav. infinty and polk are some decent priced good speakers.
i went with the complete infinity system in my cc. 6.5 in frt and i went with the boxed 6/9 in the rear. dont really use the rear seats . so i had plenty of ideas for speakers and amps