As far as the cable, I read that all hdmi cables will pass 1.4 but not ethernet. I tested this theory with one 1.4 hdmi cable (brand new) and a year old 1.3 cable (monoprice) and it passed audio, video, and 3d). I cannot guarantee yours will but I would try before you buy, perhaps other members can offer their cable experiences.
We have a 25 ft cable circa 2006 Monoprice HDMI cable that we put in when we built the home theatre, it would be good to know if it will be compatible with with the newer projector such as the Panny AE8000 and Epson 5020 passing the 3D and 1080p signal.
All HDMI cables are the same. The differences you see on websites selling them, ie. 1.3, 1.4 ect, has to do with build quality and signal retention. When a cable is spec'ed to be HDMI 1.4 compliant, that simply means that it's rated to send a certain amount of data through the cable without signal degradation or drop outs. Just because the cable says 1.3 doesn't mean you can't use them with a HDMI 1.4 port. You'll need to test it out first obviously. If it doesn't seem to pass information properly then you can buy a 1.4 rated one.
I ordered wall plates for HDMI cables. They were advertised (monoprice) to be HDMI/Ethernet plates, but they have female jacks that look just like HDMI. I haven't heard of HDMI cables passing ethernet, so I was puzzled. Why would I use HDMI cables to pass Ethernet instead of using CAT5e cables?
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