Here's the deal....
At the frequencies involved with HDMI there are
ALWAYS signal losses in
ANY cable.
However, because HDMI is a digital signal, the losses in signal strength won't affect the picture unless they result in an actual drop in the signal.
(So what they say is correct - in the sense that you won't have a picture that gets gradually worse as the cable gets longer.)
As long as the signal is strong enough to get through all of the time you will get a perfect picture... and slight variations in strength won't affect it.
However, if the signal isn't quite strong enough, you may get "sparklies" in the image, which are caused by really momentary losses in signal...
Or you may get actual dropouts, or black screens, if the losses are long enough to actually lose entire frames...
And, if the signal is "entirely lost", you may see long gaps while a lock is reestablished.
The catch is that different pieces of equipment may drive the signal a little more powerfully than others...
And other pieces of equipment may do a little better at reading even a weak signal cleanly...
And, yes, some cables lose more signal per-foot than others, and some may be more prone to allowing interference to creep in.
Unfortunately, HDMI and 4k uses higher frequencies than plain old HD, which makes it more sensitive to all of these sorts of problems.
30 - 40 feet is a very long run for a 4k signal.
So, if you're lucky, you may be able to get a solid 4k signal that far with certain combinations of cables and equipment.
However, with othercombinations it may not work, or may not work well.
And using a nice new "4k certified" cable will make it
more likely to work properly - but really isn't even close to a guarantee.
(ANd, as it turns out, an old "non-4k cable" will often work just fine for very short runs.)
A good quiality powered cable is your best bet if you want to avoid problems on a long run.
(And, since some powered cables may have compatibility issues with some equipment, it's best to try out the one you get before plastering it into a wall.)
Greetings,
I am planning to purchase HDMI cable(4K@60Hz, HDR, 18Gbps, 28AWG, YUV 4:4:4) and run the cable thru walls/ceiling between XMC1 to projector, I might need 30~40 feet cable.
Question: will there be any signal loss in long distance cables? I was reading some reviews where they've mentioned about flickering when long feet cables and some others mentioned singal drop/loss over long distance is not true. I'm totally confused, can you help me?
Thank.
Masif
