Hello, sorry for the late reply!

The -30 dB figure is perfectly logical, as I have seen it mentionned elsewhere. I actually think it may be a Dolby standard.

Thanks for confirming!
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Eric Desrochers
http://www.blu-ray.com/community/gallery.php?member=Deromax

" I hear no highs, I feel no lows, it sounds like crap, it must be Bose "