Please Explain Roon RAAT

[audio_engr]

If the Devialet amp becomes a RAAT device your dCS Bridge may become redundant. I say may because the dCS could still sound better than RAAT directly to the amp. We will not know until RAAT is running on the CI board. Presently I prefer mR->Mutec->AES/EBU to my Devialet amp over Roon/AIR. I believe the dCS (of course also a RAAT device) is in the same league as mR/Mutec (I haven't heard the dCS), so you could end up liking the sound of the dCS Network Bridge better than RAAT on the Devialet CI board.
The advantage of RAAT in the amp is that you'd be able to control many amp functions from Roon - volume for example. If you have more than one zone and want them synced, you will need RAAT. Roon/AIR does have some control of the amp, but can not do zone sync.

EDIT: I see that you use a 400. RAAT in the Devialet amps can only happen on the CI board - i.e. Pro amps. And yes, you'd still need a Roon server or Core, but the RAAT(or AIR) device is the 'renderer'

Thank you for the explanations. 

Yes - I've a D400 as I couldn't take advantage of the upgrade program. From what you've said, it makes sense for me to go for the $4k investment of dCS Network Bridge than to probably try & upgrade my D400 to 440Pro with the CI. 

Question :  Apart from controlling functionalities of Dev using RAAT thru the CI board, is there any other additional SQ benefits by opting for CI board in Dev vs. having RAAT on the dCS Network Bridge ?
[note : my end goal of going the dCS way was to add Mutec Ref 10 later to scale UP the SQ]. I can't do that with Dev's CI board.