People who run their subs hot get more bass at lower volume. But I prefer to have the bass even with the speakers and listen to the whole system at louder volumes (-5 to -10 reference, etc.). Ie., I'd rather watch Matrix Reloaded at -5 with the sub calibrated correctly (I did yesterday, actually), than watch it at -10 with the sub 5dB hot. The bass shouldn't overpower the rest of the audio. And people say things like "anything over -20 (or -15)" is way too loud, and more often than not, they are running their subs 3-6dB too hot. Another thing I found when I discovered that I hadn't calibrated my sub correctly (and had been running it 10dB or so too hot) was that not only could I turn up the master volume higher and get cleaner sound, but the bass was much cleaner and more detailed. One example is the Echo Game sequence in House of Flying Daggers (I have the full bit-rate DTS R3 version). Before, the drum hits were loud, nice booms. But after I re-calibrated properly, I could turn the volume up much higher, and the bass was much more clean and detailed - I could hear the sound of the drum skins snapping, etc., with each drum hit distinct, rather than just boom after boom, all sounding bloated and the same.