Hi
My system currently uses an HD621 for all HDMI inputs and I currently just use my tv as a “monitor” from the HD621. The audio is extracted by the HD621 which feeds my 861. In this configuration the HD621 performs both HDMI switching and audio extraction duties.

Since the HD does not support 4K HDMI signal if I ever get a 4K screen, could an alternative arrangement be to use the 4K screen as the HDMI switcher and use ARC HDMI audio out to feed the 861 for Meridian audio ?

This relegates the HD621 down to audio extraction duties from the out signal from the TV with HDMI switching going to the TV.

Would this congregation work or am I missing some ARC to HD621 compatibility issue?

Thanks
/Marcus

Lounge: 861v4+ID40 (hardwired Cat 6), HD621, 2xDSP6000.2VC (l/r), DSP5500.2HC, 2*Jamo ARTina (rears), D2500, 556, 596P, PS3, Humax HDR-1000S
Bed 2: MD600 (hardwired Cat 6) , QNAP 453 Pro