Hi,

The HD621 does not support 4K or ARC, Meridian's later HDMI switch the UHD722 does support 4K (not sure about ARC).

I know there are some historic discussions on this topic, but it sounds like you've been reading up on those ... maybe someone here has a better suggestion.

I've got Sky-Q that supports 4K and am thinking of upgrading my 1080p TV this year, so I'm in a similar situation with my HD621.

Regards,
Carl

861v6+ID40, HD621, 8000.2, 7200HC, 7200.2, SKYQ Silver, PS3, PDP-LX6090, QNAP TS870-Pro (8*6TB), Roon, iPadAir2.
[In Reserve] C15, MD600 (2*3TB), TwinStore RM (2*2TB)