Originally Posted by Asa Post
Please could you explain this further. Are you talking about a system such as a BD player (eg Oppo 93EU) connected to a processor (eg 861v6) via SPDIF using a DSP such as Direct? And that by having a HD621 connected (turned off?) this degraded the sound?
Its your use of the term "simply having the HD621 connected" that is confusing me, but I don't want to read too much into a mere form of words.
Yes, that's kind-of what I meant, except that switching the HD621 on caused the degradation in the SQ. It added a hashy sound onto the top end. Disconnecting the cables from the HD621 to the controller removed it, as did switching the power off.

Having said that, using the HD621 gave me the best-sounding blu-ray audio that I've heard from any processor.

Nick