OK, I probably spent a total of at least eight hours 'searching' for this! Now it's wine time!!

Does anybody have a diagram/schematic/whatever of all the wires going in and coming out of the bose amp?
Maybe it's not the best thing to do, but I want to cut the rear speaker wires before the amp and run them to my Punch 500X. Two channels are going to power a sub and the other two channels I want to cut the rear speaker wires after the amp and hook into them.
To word it another way; I want to take the pre-amp rear speaker wires - run them to an amp which will power a sub and the two rear speakers.
Any information?
Thanks