One idea would be to reset the receiver back to factory defaults. It is strange it is happening to both 80's. I assume you ordered from Axiom? It is unlikely, however, not impossible that the woofer section is not connected, you might unscrew the drivers and check the connections. One of my 350s was not working, and upon review didn't get hooked up at the factory.
Amie addressed the issue with the production quality control line. Those woofers should be pumping.
Where are the speakers positioned in the room?
