Go infinity for the 5x7's, however look into cutting out a wood baffle and installing it in factory 6x8 location. Then cut it out and install a 6 1/2 with the tweeter mounted below this is what I did and it's sounds incredible and is really easy to do. If you are going to go the other way using the 2 or 3 ways use 3 ways in front and 2 ways in the rear. 3 way's will give you a better soundstage up front for you the driver. Never mix front and rear speakers, in terms of brands it's not proper to do so, it will not hurt but sound wise you want to use the same speakers in the front and in the rear (referred to as timber matching). Remember to your front and rear speakers are not designed to blow your doors off with bass for that get some subs and a decent amp so that you have each speaker producing it's proper frequency.


1999 Silver Frost Contour SVT
2690 of 2760 Born 08/13/1999
Sony Mobile ES CDX-C90 Deck
6 1/2 Infinity Kappa Perfect mid & tweet set, 2 12" Infinity Kappa Perfects JBL P.600.1 for Bass, P.180.2 for front stage.