I'm trying to hook up my M2 to my xfinity x1 cable box. The x1 is hdmi out only. Can I use an hdmi out to rgb in adapter to the M2 and then a M2 rgb out to my a/v receiver rgb in and then use my a/v hdmi out that's all ready going to my TV? OR, do I need a rgb out to a hdmi in adapter to the cable in on the a/v? OR, can I use the straight hdmi to rgb cables and skip the adapter?