Nick,
Thank you for your kind reply.
Did you try connecting using just one HDMI cable for both audio + video in order to compare what difference there were with using two HDMIs cables?
I'm wondering if you did an a/b in order to determine whether or not you could see or hear a difference with one set-up over another.
thanks.
HDMI requires a video signal of appropriate bandwidth to transmit audio of a given bandwidth i.e. HD audio requires at least 720p/1080i video. Thus there is always a video signal even if it appears as a blank image.
AFAIK the Oppo 93 sends audio + video via both HDMI's simultaneously (video potentially via different processing routes).
Avi