first, this forum is about installing carputers just so you know. THere are plenty of other forums about car stereo.
Your kappas are listed as:
Why Infinity did this is amazing to me. They then say they are compatible with all aftermarket radios. That is completely stupid and false adverstising. I don;t know of any aftermarket radio that can handle 2ohm speakers. If they don't offer a 4 ohm version I'd return them and find a pair that does.
If your fader and balance are screwed up, Take it back to circuit city, they did the install.