No, just the HDMI is fine, assuming your TV is not one of the very rare examples that don't do audio from HDMI. The HDMI is live all the time with sky, just plug it in and away you go. In setup-picure settings, we find it best to select 1080i as the output res, though this may well 'fix' your aspect ratio, leaving you unable to use any zoom modes for 4:3 or anamorphic programs.