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Esto no esta muy claro todavia. En muchos foros dicen que son solo especulaciones. En foros alemanes y ingleses dicen que no sera hasta el año 2022. Realmento todo el mundo esta especulando.

Yamaha dice lo siguinte:
An issue has been identified in certain emerging video signals, such as 4K/120Hz, from select sources, resulting in a loss of picture and sound when passed through AV receivers. Yamaha is aware of the issue.
The latest AV receivers from Yamaha currently support HDMI pass-through of 4K/60Hz signals with HDR (HDR10 and Dolby Vision) and may be used with the latest gaming devices. The newest Yamaha AV receivers also currently support HDMI eARC, which allows 4K/120Hz sources to be connected directly to a compatible TV, with the audio fed to the AVR via eARC.
From the time we first announced the newest AV receivers from Yamaha, such as the RX-V4A, RX-V6A, RX-A2A, TSR-400 and TSR-700, we have stated that we will support emerging HDMI 2.1 capabilities (such as 4K/120Hz pass-through) via future updates. We will address the reported HDMI 2.1 issue via these planned future updates in order to provide customers with the best solution available.
es casi un si pero lo resolveran los problemas con futuros updates.
Declaraciones de Yamaha a flatpanelshd.:

https://www.flatpanelshd.com/news.ph...&id=1619588759

Guía rápida del A8A en la web de Yamaha Japón :

https://jp.yamaha.com/products/conte...isual&k=rx-a8a