The loudness of DVDs & CDs played through my Denon 2105 varies between the TV, DVD player & listening to FM radio. It seems to vary more between the DVD player & all other sources. I have to turn the volume up around -15 to -5 & sometimes 0 for DVDs but back it off to -20 or even lower for everything else. Is this normal or is there some setting that needs to be changed? Or could it be my DVD player? I've only manually set up the speaker levels-haven't used a rat shack meter or any other technology. I was in Tulsa yesterday on business and went into a high end AV store and heard one of their systems and it blew me away. Kinda made me wonder about the calibrations on my system and what I needed to do to get to that level. I know it isn't my speakers but it might be the level settings ,etc.

Any suggestions??