How long can HDMI cables be before signal starts to deteriorate?

Question

I currently have a 25' cable that I planned on running into the attic, over and down to my wall plate. Instead I have gone through the base board saving considerable space. Should I get a shorter cable (12' or so) or would just coiling the 25 be fine? In other words, at what point will the signal start to hurt?

thanks!

Answer 1

go 12ft. shorter runs are allways better,,,.less noise.the silver coated copper is the way to go..some of theese are extreamly expensive 250.00 $$$ up for a one mtr.3ft. allways SHORT RUNS .

Answer 2

@ 15 ft., I understand there is an 8db loss at the other end of the cable, so the longer it is the more you will have to turn it up and thus you will introduce more noise into the signal as you increase the level, in order to get the same loudness you could achieve with a shorter cord, as well as driving your equipment harder, closer to its limits and delivering you a larger power bill in the process. There are HDMI Line-Amplifiers available but they are not cheap, and they also will degrade the signal somewhat. Any length results in some loss of signal strength; and most equipment only has only so much OVERHEAD to boost a weakened signal, so how much can you OVERDRIVE to reach acceptable sound levels?(& the larger the room the less you have to play with!)

Over 12 ft I would definately add a amplifier, and be careful to keep the wire well away from ANY lighting or conduit circuits!

HOW MUCH LOUDNESS DO YOU WANT TO LOSE? or

HOW MUCH NOISE DO YOU WANT TO GAIN?

Answer 3

I think the HDMI spec is for about 10 meter or 30 feet, so you should be OK. Since you have the cables, give it a try.

Answer 4

a long time

Answer 5

You will be fine with the 25' Cable.  It is actually at 25' that you are recommended to switch from HDMI to Fiber Optics.  The general rule of thumb in the field is under 25', go HDMI for better signal quality, but anything over and you need to run Fiber Optics, which is good for up to 495' without any signal degredation.