Wiring 2 amps together

I have 2 Sony 600watt amps I had the one in the boat already. I was wanting to run my tower speakers off 1 amp and the front and rear off the other amp. How do I wire them i had my other system with the one amp wired through the high input where you wire your speakers together with a wiring block that plugs into the back of the amp from the stereo deck then you ran the speakers into the amp or out of the amp. How do I wire it the other way or can I.