DMills

I have a 2 year old Synergy sub 10 subwoofer. It's connected to the LFE/Left connection to a Yamaha receiver. The sub is set to auto and wakes appropriately (as indicated by the blue LED), but no sound comes out. I ran test signals to the speakers and no sound was hitting the sub. The wiring checked out fine. I turned the gain all the way up, still no sound. Suggestions?!?! Time for a new sub?