Think I found the answer to my questions from the other topic 'Roon'  - thanks a lot @Ulrike

Essence: need a DAC rather than a streamer since BS2 has only analog in (!)

From @Ulrike

Regarding your question, it depends.

The BS2 has neither a digital nor a usb, only an analog via cinch mini jack input, unfortunately.
So it is not possible to feed a digital signal like RAAT from a Roon Bridge via Spdif, which is then processed by the DAC of the BS2 and played back. With many other speakers no problem, just connect a Roon Bridge, e.g. a Raspberry Pi with a HAT, via spdif or optical out to a speaker, then the internal dac of the speaker processes the RAAT signal.
So for the BS2, or the A6 as well, you need an external DAC, because it only accepts analog signals.
I tried all day yesterday, rearranged and compared, and have now completely switched everything in the house from Chromecast to RAAT. Next I have set up different zones for Roon, which is no issue with Roon Ready devices, which now play in perfect sync quite like Chromecast groups.
I have a Bluesound Node 2i, to which now the BS2 is connected as well as a TV via optical for Roon.
I made a comparison - an older but quite good Denon DAC with the same cable on the BS2 sounded better than the Node, the DAC is obviously crucial here for the sound.
Everything is now arranged in such a way that Chromecast can still be used as a fallback if necessary. Who knows ... :)

caipiao wrote:

Think I found the answer to my questions from the other topic 'Roon'  - thanks a lot @Ulrike

Essence: need a DAC rather than a streamer since BS2 has only analog in (!)

Heads up ...
there are quite a few things to consider!

The BS2 has only a line-in input, so the problem already starts. Unfortunately, this input also creates a delay that can be minimized, but not completely eliminated.
As part of a RAAT zone only to use if not in direct listening distance of simultaneously playing speakers. :(
Then I'm not sure if the signal is not possibly forwarded twice ... for lack of optical or spdif connections it's not possible to bypass the dac of the Bluesound node or another :(
The signal from the node is converted and fed analog into the BS2, but then - what happens ...?
I think it's possible that the dac of the BS2 also does some processing, at least it sounds like that, flat, without color and depth, a clear deterioration. Other speakers connected to the node are sounding better.
A better dac than the node may give better results, but well, the dac I have for my main system costs more than the whole beosound itself. It has to stop somewhere.

You can use a Raspi with spdif or optical HAT, but you won't get the signal into the BS2.
You will need a dac again :(

I'm attached to my BS2 because of its sculptural qualities and love to look at it, right now, here in front of me at its usual place.
That's it.

caipiao wrote:

Has anyone here tried connecting a Roon bridge to the line-in of Beosound 2 to make it Roon RAAT compatible?

Love the look of Beosound 2 but not Roon Ready is a shame as all my other end points are RAAT compatible and capable of hi-res streaming so wondering if a Roon bridge such as Bluesound Node 2i would work well with Beosound 2. Like the one box solution of Node 2i but Pi based streamer could work too? Any quirks in the implementation of line-in on the Beosound 2 side to take note of etc.? 

Thanks in advance all

Okay, I was obviously jumping the gun. Because with Roon, not with the BS2, is quite a bit more possible than I knew so far :)
In the Zone settings, see screenshots, it is possible to compensate the delay completely.
And after some trial and error with the DSP settings for the node, I now realize that I can also change the sound of the BS2 to my liking.
How great!
I had never tried this before.
I love Roon .. :)))

caipiao wrote:

Has anyone here tried connecting a Roon bridge to the line-in of Beosound 2 to make it Roon RAAT compatible?

Love the look of Beosound 2 but not Roon Ready is a shame as all my other end points are RAAT compatible and capable of hi-res streaming so wondering if a Roon bridge such as Bluesound Node 2i would work well with Beosound 2. Like the one box solution of Node 2i but Pi based streamer could work too? Any quirks in the implementation of line-in on the Beosound 2 side to take note of etc.? 

Thanks in advance all

In the meantime, I am extremely satisfied with this solution!

Many times better than Chromecast in terms of sound, and finally working reliably, without the constant bugs and quirks that forced me to restart my entire network again and again. And really, the overall sound has gotten so much better, I can confidently recommend this solution.

Thank you, sounds promising!

Thanks @Ulrike

So it's the DAC in the Node 2i that's providing the analog signal?

I know you are pretty attached to the sculptural qualities of BS2 but I feel like I can hardly justify the combo lol. 

Thanks @Ulrike

So it's the DAC in the Node 2i that's providing the analog signal?

I know you are pretty attached to the sculptural qualities of BS2 but I feel like I can hardly justify the combo lol.