Hello Surinder,
No, I don't expect there would be any perceivable sound quality difference between the Denon's internal amps and an outboard power amp (using the Denon pre-outs) at normal listening levels. Modern solid-state amplifiers provide gain to an audio signal, with frequency-response linearity and distortion components far below the detection threshold of human hearing. There are no mystical qualities to good amplifier design. The best amplifier is one with no "sound" of its own, the proverbial "straight wire with gain", and the majority of solid-state power amps I've auditioned (and measured) do that admirably. Its job is to reproduce the signal from the compact disc, DVD, or vinyl record without adding any coloration--euphonic or otherwise--of its own. If it did, it wouldn't be "high fidelity", would it? Fidelity to the source is the goal of all audio and video reproduction.
Regards,
Alan Lofft
Axiom Resident Expert
