Completely new to WF and the jeep world! I'm looking into upgrading my sound system and have done some research as far as my next set of speakers is concerned for my 2004 sport. Based on what I've read from other threads and user reviews, I've come up with Polk audio's db 521's as my sound bar and front dash upgrade. With that being said I have no other knowledge as to what wiring I'll need to do or even how to do it. I'm also curious as to what kind of amp to purchase. So far it seems easier, or rather, more logical to install a 4 channel instead of a 2 channel. Lastly, I'm not sure what car receiver I'm going to go with but I would want one that I could connect my iPod/iphone to. Any and all advice is much appreciated!