I just sent the following email to Jim Peterson, President of Lumagen:

"Jim,

Meridian have recently launched the HD621. It takes LPCM audio on an HDMI feed and converts it into a Meridian High Resolution output (4x96kHz SPDIFs) for use with their audio processors. The HDMI output is video only. It also has an apodising filter and upsamples PCM. http://www.Meridian-audio.com/product-model/accessories/hd621-hdmi-audio-processor.aspx. Like the Radiance it has virtual inputs.

Their stance is that video should be kept separate from audio due to the high bandwidth noise so the HD621 should be the first item in the chain. There are those of us with Radiances that can see an advantage to having it the other way round (their HDMI sockets aren`t permanently powered for one), and as the Radiance will take the SPDIF of my Squeezebox at 44.1Hz feed it to the HD621 via HDMI which then upscales it to 88.2Hz at 24bits into my Meridian G68 surround sound controller which does its magic including but not limited to room correction.

What do you do in the Radiance to isolate audio from video noise? Providing users can be persuaded to connect things the “wrong way round”, there`s some synergy to be had between the two products.

Tim"

They are in Oregon which IIRC is PST so I might get an answer tonight. I hope so as I'm intending to hook my HD621 up this way round tomorrow!

Tim