Yeah, I guess you're right about the recording levels.  I suppose with newly pressed DVD's such as this one a person tends to expect a 
higher fidelity  (volume, etc) on these discs from the existing technology  

 .
Some threads in related forums have also suggested using 
presence speakers  to expand the output of the center channel (dialog) but I'm skeptical about doing this;  I've not seen anyone categorically state that this is the cat's meow for extending the dialog output.
Thanks for your reply.
-G