Not interested in the sound quality at the moment as I am planning to go and do a sound test this weekend (with a few difference speakers - MCube; Kef 2005; Kef 3005; Mission e80). However I would like to have an understanding of the differences in terms of technical capabilities so that I can take these into account. From the information I have read they are 2xHDMI in / 1xHDMI out, and do some kind of upscaling. However the 2307 mentions HDMI switching / repeating, the 2807 states 1080p HDMI swtiching / repeating, the Onkyo doesn't mention it all. What does this actually mean? The 2807 mentions multiple outputs / serial interface - is this 2 speaker sets i.e. A + B? Do the others do this? Is there anything else that one of them do - that the others don't?