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You should just daisy chain the HD621 like any other Meridian source component.

The HD621 has two comm ports, one BNC and one DIN. Its difficult to daisy chain when you are all DIN. smile With that said, I forgot I was using a bunch of DIN to Coax pigtails that I got from Meridian several years ago. So I simply made a coax to BNC cable and now I am good to go. Good thing I still had a bag of Canare BNCs, coax and RCA connectors along with some left over Belden 1694A. This is what I used to wire up all speakers for digital and comm. I think I paid $150 for 500' of this cable. Its great stuff, albeit a bit thick since it is RG6.

Before getting the HD621, I had borrowed a modifed CLUX from a co-worker / fellow Hitchhiker. Nishad borrowed it after I did. With the CLUX, I would always get a few frames of flashing black after a re-sync. Re-sync occurs when resolution, framerate or HDCP changes. No extra flashes with the HD621, so that is plus.