I have the Presonus 16.4.2 Mike is talking about. The part to this that does not make sense is if we go from mixer to Sub(In), Sub(out) to Main(in) we get no signal on the sub, just on the main. If we go to Main(in), Main(out) to Sub(in) it works.
Left and Right act the same way.
Both sub act alike. I'm going to take one of his and work with it and one of my mains to see if I can figure out what's up with this configuration. By all means it should work
I have tried resetting the board before, but can try it again.
Thanks for all the input, we will keep you posted.