robert600 :
Yes, my old receiver had no hdmi input/outputs so i used take hdmi video directly to the projector and spdif from the computer to the receiver. I can detect no loss of video quality whatsoever routing hdmi to the receiver and then to the projector. I've also heard that 'loss of quality' when talking about hdmi is a bit of a myth - apparently it either works or it doesn't - it doesn't degrade - I have no idea if that is true or not but like I said - i can discern no difference between a direct connection and connecting through the receiver. Having said all that - if you're sending 4k video - you'll want the newer standard of hdmi cables.
The difference in audio is considerable - as you pointed out spdif couldn't carry 7.1 audio.
Thanks again, Robert.
FYI, my connection will require using a HDMI 1x2 splitter, and the run from the PC to the Receiver will be about 35 ft. Researching this has been most enlightening. The "myth" of HDMI only being good, without amplification, for about 30 feet, has been one issue of concern - but this was resolved by the suggestion that a HDMI extender, with cat7 running between both ends is the ultimate way to go to overcome this apparent shortfall (until I discovered that the audio must be loosy and not compressed, otherwise the best 7.2 audio will be reduced to 2.0 stereo
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Bottom line: I'll be following the path you took, along with your suggestions and going with the HDMI from the PC to the Receiver, using a HDMI splitter.
Thanks again for your help.