(sorry I 'm late to answer: it took me some time to change to a good HDMI cable).
I finally got a certified 1.3c HDMI cable which is 24AWG, and 10m long as well,
I can say my problem is over now by using this new cable (in short, i had sparkles when playing DVD on this player). I presume my old cable was not able to handle correctly the larger bandwidth.
Still, PQ on SD material is behind by far compared to the output of the TOSH HD-XE1. I will try changing some setup on the DENON though (i already put NR to +3, color to +3, HDMI mode to PANEL, HDMI output to YCbCr),
BTW, concerning xvYCC color: the DENON is xvYCC color compatible (ie it can output 48bit coded color data), my projector (PANA PT-AE2000) is also xvYCC color compatible, but i noticed the DENON 's sets this item to auto but disables it in the setup, and in the projector menu this option is disabled without any status. Question: how can anyone know if this option is turned on, and when; does it depend on the disc at play, etc...
thanks in advance.