my simple humble input.  tune them so when: 1. You watch actions movie, sci-fi etc, you could hear the 3-dimensional feels as you are like in the movie.  2. When you watch concert, you can feel like you are in the hall watching it. DSP in AV help in enhancing this feeling but must select the one that fit the right size of the concert hall.  So in order to get that, you also need to work on: 3. Some AV come with auto calibration like Audyssey and YPao.  4. Beside level, also consider distance, EQ and Xover.  5. Location of your sub. Sweet spot vs a location for space.  6. Go google and read, many in the web these days that has great advice..... so u can start from here  http://www.audioholics.com/tweaks/connecti...eo-set-up-guide  and here  http://www.audioholics.com/tweaks/get-good...est-performance  happy calibrating... u have a long week end to do it...