I own a 82Q950R (2019) and i found this e-manual under "support" of the product page on Samsung's regional site.
to summarize the e-manual.
The HDMI 3 (ARC) port of the One Connect Box is also eARC (v2.1 supposedly)
To be eARC the port must follow the v2.1 HDMI standard.
HDMI ARC - What is eARC? Audio Return Channel - HDMI
Maybe. Manufacturers can produce products that are compatible with both eARC and ARC. However, eARC is not defined to be backwards compatible with ARC.
AND
The e-manual is stating the HDMI 4 port is capable of (7680X4320 at 50/ 60FPS)
This is clearly above HDMI v2 that is limited to 4K but below HDMI v2.1 full specs when the resolution can go up to (7680X4320 at 120 FPS).
HDMI 4 port appears to be v2.1 compliant but has no eARC.
Because the specifications are based on the current 8K connectivity and decoding standards, future connectivity, broadcasting, and decoding standards may not be supported. Upgrading for meeting future standards may require
To me Samsung is playing a very risky game.
Question : How do you enable or disable the eARC ?
The answer is the link for the 2020 Samsung Tvs not 2019.
to summarize the e-manual.
The HDMI 3 (ARC) port of the One Connect Box is also eARC (v2.1 supposedly)
To be eARC the port must follow the v2.1 HDMI standard.
HDMI ARC - What is eARC? Audio Return Channel - HDMI
Maybe. Manufacturers can produce products that are compatible with both eARC and ARC. However, eARC is not defined to be backwards compatible with ARC.
AND
The e-manual is stating the HDMI 4 port is capable of (7680X4320 at 50/ 60FPS)
This is clearly above HDMI v2 that is limited to 4K but below HDMI v2.1 full specs when the resolution can go up to (7680X4320 at 120 FPS).
HDMI 4 port appears to be v2.1 compliant but has no eARC.
Because the specifications are based on the current 8K connectivity and decoding standards, future connectivity, broadcasting, and decoding standards may not be supported. Upgrading for meeting future standards may require
To me Samsung is playing a very risky game.
Question : How do you enable or disable the eARC ?
The answer is the link for the 2020 Samsung Tvs not 2019.
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