thanks J Garcia but i knew that stuff already

I think I did a poor job of describing my problem..
DTS and DD 5.1 only...not analog...that's fine.
Center channel volume from those two discs, ones I use all the time for reference, are MUCH lower. Compression is off. I know I use the receiver for volume control on DTS and DD.
This is the third 2910 i have had in the past month. First two I bough thinking they were new, both were taped up and sold as new. I never noticed low centre channel volume on those. This third one is a demo as they were sold out of the player. Hopefully my "new" player, which hopefully arrives this week direct from Denon, won't have this issue.