[skifreak69]

From what I have seen, your deck has a single preamp output (1 pair). So I beleive your best bet would be to hook up a four channel amp through hi level (signal taken from the speaker wires rather than rca output) This will still allow seperation of front and rear and left and right. If the four channel amp has hi level inputs you just have to run speaker wire from the deck to the amp and connect accordingly (front wires to front input, rear to rear) Otherwise you can use a hi level convertor that converts the speaker connections to an rca output, then just run the rca's accordingly. As for the sub amp, I would run that off of the preamp output on the back of the deck.