I'm completely lost by what you're saying. Let me see if I can explain it another way.

I'm only talking about line-level RCA connections. You can connect an RCA output cable to more than one RCA input with a Y adapter, and there will be no problem with the signal.

So what I'm doing is sending the empeg's FRONT outputs to TWO sets of channels. In effect making my four main speakers all come from the front outputs. My empeg's REAR outputs go straight to the subwoofer amplifer.

Beyond that, the only way I can explain it is to draw a picture.