Another nice feature of the HD621 is that it will act as 'sink' which will allow you to switch off your display if you should ever want to listen to music from e.g. Bluray source.

The only negative characteristic of the HD621 (apart from its single HDMI output) that I've found is that is does appear to fussy with respect to the qulaity of the HDMI input signal. I have had problems with a 6m cable between a satellite source and the HD621. Easily solved by adding a signal booster.

Main system - Sources (Kodi-HTPC, Vero 4k, FireTV, Sat) into Trinnov Altitude 32 (8-16) (+Roon), Trinnov Amplitude 8 amp & Vivid Audio (Giya G3, V1.5) and REL Stentor III speakers. Others: F80 + Raspberry Pi and other Pi systems.