Thank for all your replies.

I'm confused, do you mean Oppo 203 or 205 can worked with a HD621? Because my dealer told me that a HD621 need both signals to work.
As I know 203 or 205 have 2 HDMI which separate audio and video?

G68, HD621, Proceed HPA 3, Thiel MCS1, PS3, Pioneer BDP-09FD