Finally, something to be proud of!

This is my first serious stereo system since my Harmon/Kardon set up with Bose 601 speakers was stolen from from my home back in '90. I have a lot to learn about the Onkyo (Network) Receiver and setting up my Speakers for optimum sound. I have the Klipsch 10" Subwoofer matched with the Klipsch R-26F floor speakers. Right now the sound is great and very powerful! But I'm sure the more I read it will sound even better. There are two knobs which control the SW that I still need to figure out. If anyone has anything similar or can give me any ideas, please do. I haven't bought  rear speakers yet, as this was quite the price to build. But I know already I will have this set up for a long time.