hi all i'm not an expert by any means when it comes to audio but i know good sound when i hear it. Basically i have a mk3 16v gti and i'm getting round to sorting the ice. For the time being i'm gonna be running the speakers through the HU until i have the dollar for the amps and subs etc. In the front door cards (unless told otherwise?) i'm going to stick either some alpine spr 17s's or some infinity kappa 652.9i's. i have bought some infinity reference 6500cs and they are just a big speaker with some separate tweeters. I want to make sure that the rears only get the low frequencies so i can leave the fronts to do the mid and high stuff. is this a good idea? what do i need to achieve this? any advice or help would be appreciated!