it sounds like u want the same audio signal going to both amps, is this to run a pair of subs.
The easiest way is using a "y" patch cable or two, it splits the signal equally.
kreekatt your a moron. This guy is talking about Daisey chaining the amps together.
Take a set of RCA cables and run them on the out from one amp to the input on the other. The out from that amp to the stereo. The first amp should get the speaker wires to the subs.