Expert Pro sound quality

[Hifi_swlon]

In some recent email correspondence Mathieu Pernod at Devialet told me that the OS board will represent a greater evolutionary step than anything else so far announced for the PRO series.
Guillaume

And they're generally pretty understated in their claims so this could really be the one

Seriously though, I am too. Did he give anything away to support the claim?

As to the D sounding worse, that seems doubtful as there's already an ageing streamer board inside. If anything they should know a lot more about isolating this kind of thing from the rest of the hardware even if  the new one's 'more powerful'. I've got a microRendu but as good as it is it's still Ethernet > USB > whatever the Devialet uses to connect that to their motherboard (i2s?). In theory cutting out a step shouldn't be a bad thing. If done right.