Yes for any kind of well recorded classical or jazz at moderate volumes in anything but a small room a 100w receiver amp would guarantee you clipping at peaks and transients. Many people often mistake the sound of clipping distortion with "loudness" and rush to turn down their gear. Without clipping distortion higher SPLs don't sound so loud.
That's often the first thing people notice when getting a more powerful separate amp. Other nuances like greater bass control or more textured sound usually follow. Doing a side by side comparison with different recordings and at varying volumes can be very revealing.
Denon makes a good product and it's true that the tradeoffs inherent in an integrated box are getting better but the quest for less compromised sound quality usually leads people to separates. Once someone goes that route they hardly ever buy receivers again. Over a longer time period, I've always believed its better value to go with an amp and upgrade the processor occasionally.
