So If I put it in mono and plug both TRS's into the amp, turn both channels on the amp all of the way up, and turn the subwoofer level on the reciever all of the way up, I get sound. Long sentence :P
With everything cranked I get a reasonable level out of the subwoofers, almost perfect actually. I wouldn't want to go any higher. The only explaination that I can come up with is that the receiver just can't send a strong enough signal to the ep4000. I'm using a YAMAHA RX-V371. So my problem is solved for now, hopefully it can send a strong enough signal to the daytons when I get them.
I realize I kind of solved my own problem, but does anyone have an opinion on this?