I have a few questions regarding calibrating speakers with the S&V disk. I'm using 4 Paradigm Titans with a CC-170 and a Kenwood HTiB Sub (To be upgraded to a SVS 0r at worst a Paradigm sub as soon as cash permits) powered by a Kenwood VR-509. First, I calibrated my system back in may when I bought the disk and the SPL Meter, that was about 3 weeks after I got the speakers. Ref Level (If test tones @ 85db means ref) is with the volume at -22 for DTS or -18 for AC3. Then I checked again last week and now the ref levels are -21 and -17! Why is everything 1db quieter? Speaker Break In? Speaker Cable Break-In? Amp wear? SPL Meter going "Deaf"? I'm a little worried here! The other question is about the sub, I know my sub is a wimpy one, but anyway. When using the S&V disk, there is this tone that plays on the left speaker and then the sub and their SPL are supposed to match on the meter. I did that, although the sub's SPL seems to fluctuate a lot, the average is about the same as the main's level. My question is, with those at (Almost) the same level, does that make the subwoofer 10db louder than the rest as per reference levels (105db for all spks, 115 for the sub) or should I set my dub at 10db higher than that of the left channel. Also, when I watch a movie, the confortable listening level for me is about 10 under reference (-27 on the dial give or take a few depending on the movie) but whenever I play music (From Ogg files on my PC connected to the SPDIF input) the confortable listening level is more around the -40 mark? Why are Ogg Files louder than DVD?