Would Dynaudio Contours mate well with Denon?

the dyns would need more currrent then the denon provides to get the best out of them, the denon would drive them but not to their potential, also, denons tend to be on the bright side, not a good match for dyn, IMO, good luck

If you want Dyns to match with your Denon go with the Audience line (which is quite good) as the Contour line wouldn't be living up to it's potential with a receiver.

I have a Denon 5800 with 2 Dynaudio Contour T2.5s a T2.1 and 2 Contour 1.3s (the older version of the 1.3mkII - I bought these used). I have not yet purchased the Contour Sub and I cannot imagine how there could be any more bass - I can't wait to find out.

This combination is Magnificient. Yes, true audiophiles would say that and amp-preamp combination would sound better, but I disagree. The trade off between that 10% of music that might benefit from a dedicated amp is not worth losing the incredible home theatre experience and ease of use. The system sounds good at low volumes as well as when it blows the paint off the walls. I love it.

No I do not think the Denon is up to the task.. Get a Krell or Mark Levinson or class A design beefy amp. Or at least Audiolab pre-power combo. The Dynaudio well sound bright if it is underdriven, it well sound even brighter with DENON!
Good luck.