Hi

You use it with the HD621. Plug the audio out HDMI cable from the Fury to the HDMI in on HD621. The video out from the Fury goes directly to your display.

Your HDMI sources (e.g Blu-Ray, Sky-HD) plug into the Fury.

(That's an overview) . There is some tweaking to do afterwards which I will try and find the link to.

Cheers
Tom

Main: G61SL, 218, HD621, 2*7200SE, 7200HCSE, M6s, DSW, Apple TV 4K, NUC (Roon server)
Secondary: Wiim Pro, 3200, Audio Core 200
F80