This is a 2 channel amp and you want to hook it up to 4 speakers? Realize that you will have no fading control and its generally frowned upon. Your choice. Connect the right speakers (front and rear) to the right output. Connect the left to the left. Do not use teh high level inputs.
No way to easily test it in the home. You could hack a power supply apart but its a bad idea. Just hook the thing up.
Thats the right cable