Hi, I have the philips 9664 and watch sky hd, this is also connected via my amp. No problems, its no different to connecting a bluray player?
Depending what tv processing you have left on you may have to adjust the lip sync as there will be a delay, i have a few settings on minimum so therefore within the sky box settings i have a slight audio delay. I find with my bluray player i turn all processing off as the source is good and there is no audio delay, again all of this goes through my amp.