HDMI for 4K, minimum 30ft - AVS Forum | Home Theater Discussions And Reviews
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post #1 of 4 Old 08-18-2014, 07:16 AM - Thread Starter
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HDMI for 4K, minimum 30ft

Hi there,

We're going to install Sony VW 500 4K projector, and the input is from Lumagen Radiance 2144.

Anyway, we need about 30ft (minimum) HDMI cable, even a slight longer cable would make our installation process easier.

Anyway, can you guys share what HDMI cables that are proven able to transmit this gigantic 4K signal on such a long distance, and whether you guys transmit 24 Hz or (maybe) 60 Hz on the cable?

Your information is much appreciated.


(note: we have tried several brand cables, then the longest HDMI cables we could successfully transmit the 4K material was only 21ft.)
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post #2 of 4 Old 08-18-2014, 07:19 PM
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High speed passive HDMI cable is certified up to a maximum of 25'. But not all cables have been certified so you need to find out if a certification is available for the length of cable you buy. Any high speed hdmi cable will do what you want if you buy from a reputable mfr/dealer. For runs longer than 25' you might want to consider an active cable like Redmere. They have a little chipset in the sink end which draws a small amount of power from the HDMI input so you can have cable runs longer than 25' and still meet the HDMI 1.4/2.0 specs.

You can always use CAT-6/HDBT for longer runs but that can be a bit expensive. Whatever you do, if the cable is to be installed in a wall, you'd be best to consider using a 1" conduit to run your cables in. It makes replacing/repairing cables a whole lot easier and if you run CAT-6/6a you can sort of "future proof" your cabling for quite awhile. Run two cables or more in case you think you may have need in the future or just put a pull string in the conduit with your cable.
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post #3 of 4 Old 08-20-2014, 05:46 AM
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Hi, here is a traduction from my french article :

HDMI Cable 2.0:

The HDMI standard primarily concerns devices and not the cables. The version indication is exceeded, and even banned since early 2012 by the HDMI consortium. Labeling "HDMI 1.4 cable" is a selling point. Only High Speed ​​labels (class 2) and standard (class 1) are now allowed. But with the arrival of the UHD, flows that have to bear the HDMI cable are now beyond the initial specifications for Class 2:
- Class 1 permits a frequency of 74.5 MHz, a rate of up to 2.23 Gbit / s (allowing nearly all the videos in full HD Ready and 2D).
- Class 2 permits a frequency of 340 MHz, a bandwidth of up to 10.2 Gbit / s (for all HD Ready and full 2D and 3D signals and all signals UHD 4: 2: 2 and 4: 2: 0 to 30hz).

Cable manufacturers did not wait for the HDMI consortium to update the amounts authorized by the class 2 and already selling cable high speed (class 2) allowing a bandwidth of 18 Gbit / s (up to date). All HDMI cables Class 2 are compatible with HDMI 1.4a and 2.0 devices but not all able to spend the maximum bit rate of 18Gbit / s possible with HDMI 2.0. If you already have an HDMI cable (Class 2) and you plan to use it on a new HDMI 2.0 equipment, first flow assurance check by the manufacturer of the cable (eg website) and compare the result with the following for the type of signals you can spend table:

In green : you need a class 2 HDMI cable with maximum rate of 10,2 Gbit/s
In violet : you need a class 2 HDMI cable with maximum rate of 18 Gbit/s
In red : class 2 HDMI doesn't exist yet.

HDMI 2.0 cable length :

The last point concerns the length of cable and passive and active cables. The specifications do not specify an "official" length limit in terms of HDMI cable. However, the industry has enough experience to know:
- That from 7.5m, signal attenuation occurs that may cause stuttering of the image, or a black screen because the signal does not arrive at all. Beyond 7.5m, greater the length of the cable is, more the signal is attenuated.
- 15 meters seems to be suggested by most manufacturers for "Passive" HDMI cables before attenuation becomes too large. It is from this distance that the first HDMI cables called "Active" is found.
- 20 meters seems to be the upper limit for an HDMI signal correctly goes by a single cable called "Passive" and there are only a few references to passive HDMI cables that distance and the fare is as a result of technologies employed ...

For cable lengths between 5m and 20m, manufacturers generally operate cable sections of different diameters using the unit of measure AWG. It operates at a conventional scale contrast: an AWG 26 has a diameter of 0.4 millimeters and a cable AWG 24 will have a diameter of 0.5 mm (26 and 24 are in fact the number of passing machine: the drawing machine). In other words, as the cable is, the more the number of passes through the machine is important. A larger diameter cable will be better, because the section of copper son inside will be greater. AWG 24 ensures the transport of HDMI signals over distances of up to 15m cable (up to 20m if combined with other technologies) while AWG 30 or more does not exceed 5m.

Beyond 15m, there is a solution so-called "active" cables: These cables incorporating a signal amplifier, as found in some boxes or Switch HDMI splitter to allow a transfer HDMI signal on long cables without losing quality, or worse the signal while in full.

Another option to send a HDMI signal over long distances, professionals have created high definition technology by the name of "HDBASE T". This is actually to get the HDMI signal over an Ethernet cable. Specifically, this system is based on a transmitter and a receiver. HDMI signal you want to send will leave your HD device to the Ethernet transmitter via a HDMI 1.4 cable; This will turn it the HDMI signal into an Ethernet signal. The Ethernet signal supports indeed very long distances. An Ethernet cable then leave your transmitter to go to the receiver who will reprocess the Ethernet signal to an HDMI signal. The receiver, it will do more than connect another HDMI 1.4 cable to your screen.


Last edited by safe91; 08-21-2014 at 07:36 AM.
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post #4 of 4 Old 08-20-2014, 10:14 AM
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Solid core CAT-6 cable can handle that. Existing certified high speed HDMI cables can handle the bandwidth up to 18Gbps. Redmere and HDBT probably won't be able to achieve those bitrates without a hardware upgrade. There is speculation that the UHD system will hopefully settle on 4:2:2 at 12-bits as the standard but that is down the road a bit if it ever happens. The bottom line is install your cabling in a conduit so you can easily pull new cable as the devices connected to it finally exceed the capabilities of the cable. In the meantime, solid core CAT-6/6a and certified high speed hdmi cables will work just fine.
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