Craig,
I recommend Denon, no problem with the SPDIF (Pro bits on) from the DeckLinks and have also used Sony DB and ES series units with success.
In a recent installation of a DeckLink HD Pro Dual Link for Iron Maiden I came up against the Yamaha not liking pro-bits and every digital amp in the client’s home was Yamaha, went out and bought a Denon problem solved.
On the big Yamaha units you can see that a signal is coming in but no sound, it’s very much like the consumer DAT units that don’t like pro bits either and is probably some form of digital copy protection getting in the way.
Jonathan
Jonathan Smiles
Managing Director/CEO
Digital Safari Ltd
UK – Specialist Reseller
dCinema – HD – SD
https://www.digitalsafari.co.uk