I know the theory and what you are "supposed" to do, but it seems like I can't bring myself to lower my sub's level so that it reads the same as my other speakers on the spl meter. I have my sub at between 6-7 db higher than my other speakers (using the SPL meter). This is both on my receiver's internal test tones, and using audio calibration DVDs. When I lower it much below that, I just don't seem to get the oomph from my sub that I like. I also don't feel that my sub is overpowering the DVD soundtracks, where I have it right now. My current setting seems to be a good compromise between a nice sub impact, and blending of the soundtrack. The one thing that bothers me is that I don't feel the room shaking in movie theaters. Yet I hear alot of people talking about the room shaking in their home theater (and mine does too on certain explosions and where you might expect to feel shaking -- not the whole time). Is this because most subs are cranked too high at home? Is 6-7 db too high? Why don't the walls/floor shake in the movie theater? And I'm talking new multi-plexes with supposedly the latest and greatest in sound set-ups. So where do most of you calibrate your sub relative to your other speakers? Am I nuts for having it 6-7 db higher? In case it matters in your analysis, I have a Paradigm PDR-10 sub. My receiver would be playing DVDs at reference level at a reading of 82 on the main volume display. I play DVDs generally at about 67 (which is plenty loud). My receiver is an Onkyo TX-sr701.