Page 1 of having sound problems can anyone please help

as mentioned i i have sound problem and can,t solve it.

When i noramlly listen to dvds i use my amp and mute the TV sound

recentley i have been noticing that the(speech) sound in general fom the centre channel seemed low.

so while watching swordfish i alternated between my amp centre channel and my tv sound playing all centre channel sound

the sound from the tv had much more background to it and i could hear things that were not ther when coming through the amp the speec levels were better and generally ab better center channel sound

My thoughts about the problem are as follows

could i have a faulty speaker ( seems ok with the test tones)

or i recentley hacked my dvd its a philips ( using the standard philips hack) do i need to do somthing else in the set up menu

could it be my channel levels i have played around with them to no avail

Any help or advice would be great , i have just got 5 new dvds but don,t want to watch them until i get this sorted.

my system

philips DVD958
denon AVR-F100 amp
denon NXT flat panel speakers