Chuck,
Hey. For how to set up those high-level inputs and outputs, take a look at the owners manual for the Sub-10 and Sub-12 at
this link. It's pretty straight forward, but just let us know if you have any questions after you look at that.
With your Yamaha 663, I would recommend using the line-level LFE input instead of the high-level connections. The receiver would do the bass management for you, send the low frequency signals to the sub, and then send the higher frequencies to your other speakers. That's always my first choice. If you use the high-level connections, then the sub is filtering out the low frequencies and sending the remainder to the speakers, but it can only do that for two speakers (so, if you have a surround sound system, then you're better off using the LFE input).
Adam