Hdmi 2.1 4k @120hz Dolby vision compatible cable

pixelpidgeon

Distinguished Member
Is a hdmi- 2 cable 4k 120hz is necessary to send the audio from TV to surround amp, considering surround amp is not 2.1 compatible. TV has Dolby vision. In other words, to connect a Dolby vision Blu-ray player I need a 2.1 cable to the TV, but do I need one to the amp as well or will a basic hdmi cable suffice for sound only? Thanks

To add I am also using a ps5 that will be connected directly to the TV and then the audio from the TV to amp via hdmi also
 

dante01

Distinguished Member
You'd ideally want a 48Gpbs compliant certified ULTRA cable.Details on certification can be found here:


You'd strictly speaking not need it to be certified by HDMI org, but the certification would be an indication that the manufacturer has had the cable tested by HDMI org.

The additional bandwidth required to send the 4K video at 120Hz has no effect upon the audio. You don't get anything in terms of audio that couldn't have been sent via a more conventional HIGH SPEED cable and the audio formats currently being used are no different to what they were prior to the advent of HDMI version 2.1.

You'd not need any ability to convey any video at 120Hz from a Blu-ray or UHD disc player. No player has this ability and nor would it need it. Neither will you get a player that is inclusive of HDMI version 2.1. The higher frame rate.bandwidth associated with HDMI version 2.1 is only really of any relevance at this point in time if using one of the new gen games consoles or a Windows PC for gaming.

If you've an HDMI 2.1 equiped games console or consoles and an HDMI 2.1 equipped AV receiver then you'd need a cable from the source or sources to the AVR and then one from the AVR to the HDMI 2.1 equipped TV in order to be able to pass 4K 120Hz video out from the source, through the AVR and out to the TV. Games consoles only have one HDMI output.

If the PS5 is connected directly to your TV then you'd want both the TV and the AVR to be eARC enabled. You'd not need a 48Gbps cable netween the TV and the AVR in order to be able to convey audio from the TV to the AVR via eARC. You'd need eARC because this can convey not on;y HD formatted audio but also the multichannel PCM signal more often used by games consoles.

If wanting to continue with the setup whereby the console is connected to the TV as opposed to the AV receiver, you'd only need an ULTRA 48Gbps cable from the console to the TV. The cable between the TV and the AVR need only be an 18Gbps HIGH SPEED HDMI cable that is ethernet channel enabled in order to enable it to utilise eARC .Again, note that both the TV and the AV receiver will need to be eARC enabled! ONly one output on an AVR receiver will be eARC or ARC enabled and only one input on the TV will be eARC enabled.

Remember, you'll only need the 48Gbps ULTRA cables between devices that are equipped with HDMI version 2.1 and that will be handling higher speed/hogher bandwidth video via those conections.
 
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pixelpidgeon

Distinguished Member
Hi @dante01 thanks very much for your help and detailed reply. Would a hdmi 2.1 high bandwith cable not be needed to send Dolby vision from the Blu-ray player to the TV direct?
 

dante01

Distinguished Member
No, Blu-ray players are not equipped with HDMI vesion 2.1 and neither is there anything encoded with video that would require it if using such a player. The most you'd get in association with Blu-ray or UHD discs is 4K @ 60Hz and most films will have a frame rate of 24 or 25 fps. The 48Gbps cables are pointless unless the devices the cable is being used to connect are equipped with HDMI version 2.1 and the content being conveyed between them is a type that would need the additional bandwidth. The Dolby Vision HDR encoded video you get on UHD Blu-ray discs needs nothing more than 18Gbps HDMI version 2.0 and will not need anything more than an 18Gbps High Speed HDMI cable. The cable doesn't wnhance the video and is simply the wire used to convey the signal from one device to another.

The only time you'd currently encounter anything encoded as 4K with a 120Hz frame rate would be in association with the latest XBox and Playstation games consoles and only if playing games that are designed and written to utilise this higher frame rate. You are very unlikely to ever need it relative to films bought on a physical disc.

ULTRA HDMI cables are only required if connecting 2 HDMI version 2.1 equipped devices together and if wanting to convey 4K 120Hz or 8K 60Hz encoded video signals.
 
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