@Jeanpher
A few silly questions.
Have you calibrated your AVR?
Denon (like the Marantz I have) should have source/channel/tone level controls.
Are all of these at factory settings (0dB by default)?
If it is at 0dB, then you may have to turn up the volume higher to perceive loudness.
Playing around with these 3 controls will make changes the way speakers sound.
Cheers,
Raghu
Tone levels are
Bass +5db
Treble +4db
Input/Source level 0db
Channel, what is this? u mean Bi-amp?