Sub levels are all over the place- my receiver's tones for the sub show it about 6-8 db below the level of the other speakers. Then using THX Optimizer, sub levels show 6-8 db above the levels for the others. Lastly, Digital Video Essentials pins the meter when measuring the sub, making it at least 10 db hotter than the other levels. Which is correct? My initial judgement is that using the receiver's level seems to make the sub too hot, while the others seem way too low. It seems that it sounds best at about 3 db below where the receiver's tone says it should be- maybe this has to do with the meter's sensitivity at bass frequencies. Ultimately, I'll go with my ears as the final say, but I'd like to at least be in the ballpark first. BTW, receiver is NAD T752, and the sub is a PSB 6i. Speakers are PSB Image Series. Thanks for any insight.