Everything seems to be cranking along! The sub is pushing out some serious bass with the LFE. I was looking at the inputs on the sub and the outputs on the AVR and thinking, "well, there's multiple plugs on each so I must have to connect them all," not realizing that it was a simple one-wire solution. I appreciate all the help on this forum. You guys rock and/or roll!
Edit: I didn't even realize that the LFE was an input. There was a rubber cover on it and I thought it was some kind of light :/