Originally Posted by Greg Wright
I dont know why you would expect the HD621 to improve the picture.
Depends on whether or not the HD621 contains the HDMI signal regeneration technology used in the HDMAX 121 extender and 421 switch. Given that the HD621 performs a non-trivial operation on the HDMI stream (extracting the audio and NOT outputting the audio on the HDMI output by default), it would seem likely, at the very least, that the HDMI stream is subject to buffering/de-jittering.

Roon Developer and ex-moderator of this Forum
I am #25 in the HH1 photo of fame.