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I'd like to connect my PC to an HDTV using an HDMI-HDMI cable. The distance between them is about 8 m; is the length going to be an issue? I'm worried the signal might deteriorate over such a distance.

Also, does price have any major impact on the signal quality? I'd like to buy an 8-10 m cable for somewhere around 20$. Would such a cheap cable be good for what I want?

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6 Answers 6

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According to these Gizmodo articles (The truth about Monster cable, Part I, Part II & Part III), for a short 2m run practically any cable will do, but for 10m runs to 1080p you might run into problems with lower quality cables. They suggest trying a cheap cable to start with and if you have problems look for a certified HDMI 1.3a "Highspeed" cable.

The Monoprice 35ft ($35.17) and 50ft ($53.64) cables they tried both failed the 1080p lab tests though the 35ft cable passed the real-world test when connected to a TV (rather than a signal analyzer), possibly due to error correction built in to the TV. So that cable might be a good one to try.

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I have to say, I read the articles from top to bottom, but I'm more confused than when I started :). Thanks for the links, by the way, I remember reading those articles. So, in your opinion, would a cheap cable be ok for 1080p at 10 m (~33ft)? –  alex Nov 8 '09 at 16:19
    
I know what you mean about those articles - but they seem to suggest that the cheap(ish) 10m Monoprice cable should do the trick. If not, you've lost ~$30 dollars which is probably a better bet than going for the expensive (>$100) option to start with. –  pelms Nov 8 '09 at 19:09

There is no definitive max length specified in the HDMI specification. I'm using a 5m cable myself to transmit 720p without issue.

There's usually not any difference in quality between cheap and expensive cables. I would go for the cheapest cable I can find at the length you want.

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The thing is, I've had problems with a DVI-HDMI cable. 720p was fine, 1080p was awful. That's why I'd rather be certain before I actually buy anything... Anyway, thanks for the answer and +1 –  alex Nov 7 '09 at 16:30

I recall a study where cable quality only matter when the length is insane, like 50m+. Sadly, I can't find the study/review right now.

If I were you I wouldn't be worried and I'd run right over to monoprice.com

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I'd really appreciate it if you could find that study, or at least something similar. –  alex Nov 7 '09 at 16:28
    
argh .. I just looked for 30 mins and can't find it. The review had signal quality pictures too ... bummer :( sorry –  basszero Nov 7 '09 at 21:35
    
@basszero no problem :). Thanks for taking the time, though! –  alex Nov 7 '09 at 23:09
    
sweet pelms got it! –  basszero Nov 8 '09 at 5:28

I just installed a hdmi cable over a distance of 20 meters. At first I bought the cheapest 20m cable I could find -> 50€. Somehow it didn't really work. It worked for my tv, but not for my work lcd (which was the primary target). I then bought a cable for 100€ (again 20m) and that one is high speed certified (whatever that means) and has a build in repeater. The second cable worked just fine. It can transmit sound and video in full hd resolution - can't test any higher resolution.

I have a similar experience with dvi cable. Which tough me one thing: If in doubt, buy a reasonable cheap cable. Non cable is worth a fortune, but the cheapest one never works.

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A tale has been drifting around the Internet for some time to the effect that the DVI and HDMI specs give a maximum distance of 15 feet. This isn't actually true. The HDMI spec, in fact, gives no length limit explicitly at all, but the requirements of the spec implicitly give rise to some length limitations for "compliant" cables. A cable isn't permitted to degrade the signal past a certain point--that point is a bit hard to put one's finger on, because a cable is deemed spec compliant if it meets either of two tests: an "eye-pattern" test which measures the overall shape of the HDMI waveform at the cable output, or a set of parametric tests which measure the attenuation and other losses in the signal.

from http://www.bluejeanscable.com/articles/how-long-can-hdmi-run.htm

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Unfortunately, the signal does degrade, especially on cheaper cables. Thanks for pointing the article out, though. +1 –  alex Feb 4 '10 at 9:42

Standard cables are supposedly ok up to 5 meters while highspeed cables should be good for at least 15 meters. Longer than that will probably not work too well without active signal boosting/extenders.

Obviously at 10 meter it'll be about the cable quality and not its price nor its marking, so anything goes. According to Wikipedia the standards marking is relatively new and older cables could easily be of good enough quality to beat today's highspeed cables without being certified for it.

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