My only concern would be the preamp needed. NC502MP works under 2.35Vrms sensitivity. Not sure your Denon may get any close to that, especially when using others powered channels in the same time (I remember it to clip at about 1.4Vrms in that case).
On the 4700, front L/R can be placed in pre-amp mode. At least, I'm assuming 948s are for L/R? I believe it can hit 4V that way, although not specifically called out in the 4700 reveiw here.