Thanks for the replies.
3DB - there isn't really a proprietary cable. The speaker sits on top of the sub, connected to it by small metal strips that match the bottom of the speaker to the top of the sub. No cables to detach. The sub is then connected to the receiver. There are no cables connecting the speaker to the receiver at all but the speaker still works fine. That's why I'm sure the cables are good, the power is good and the connection is OK. If any of these were the problem, the speaker wouldn't work. Also, I did check the settings on my receiver. It had to reset them since the system was disconnected throughout the renovation but I'm sure I set them the same. However, since it obviously wasn't working right, I did try a variety of settings on the receiver to try and fix it. So far, no deal.
Ducker - I'm not really sure what LFE sound is. I can tell you all 6 regular speakers are working fine (a front and back left & right and a front & back center). It seems odd to me that both subs (yes, I have 2) would die at exactly the same time. Too weird. Neither have been attached to any other receiver. They were bought at the same time as the Onkyo and worked great until now.
I'm sure I can call Athena somehow but my vendor might not be of much help. I bought the whole package through Visions - primarily because a family member worked there and I got an exceptional deal. However, he has since moved to Alberta to run his own store and I've generally found that staffers in these places know less than I do (and that ain't much!).