Just thought of something..
How about this set up?
2 amps
1) 2 Channel amp to run the tweeters - RCA's from Front output on Headunit
2) 5 Channel amp to run the front mid, rear speakers, and sub. I'll use 2 Y splitters - 1 on Rear Left and 1 on Rear right so that 4 channels (2 for front...