How to hook an equalizer in a car?

I have an alpine iva-d105 head-unit in my car and just got a power acoustik 7 band equalizer from a friend. The radio has a front out, rear out, and sub woofer out on it, and the equalizer only has one input. if i hook just the front 2 it all i get are m front speakers, same with rear etc... but i thought hooking the sub woofer out into it would make everything work, however it doesn't, no matter which way i hook it up all i get is 2 speakers working. Its a power acoustik equalizer with sub out front out and rear out. i have 3 pairs of 2ch inter-connects ran to my trunk, 4 got to my 4 channel amp and 2 go to my mono block amp. i hook all 6 into the equalizer outs, and then i can hook the front out coming from my radio to the input on the equalizer and i can only get 2 of 4 speakers working, the rear does the same thing and the sub woofer does the same thing 2, so i guess my question is how would i split my inter-connects so that i can get all four speakers working?