ok guys, Need some honest advice. Bought a lovely 4k projector, uhd550x. Now my dilema. 15m cable run. I need options pls, i can of course purchase a 15m fibre hdmi cable, but is there such thing as a copper cable called ultra hdmi that can go 4k over 15m? I tried cheap cat6 hdmi extenders, but didnt work for me, but happy to have these as as a suggestion. Whats the gig guys? How do i get this to work?