connecting B&O to Sonos, with TV sound through B&O?

Hi @Andrew19789, sorry for the late response and welcome to the community.

I would like to know what role the Sonos components will have on your existing system.

Will they be a Transmitter to the Sonos system or Receiver to your Beosound system?

Do you have a Sonos system and you want to integrate the Beosound to the Sonos system?

Also, looking at the B&O Beosound 3000 system; it doesn’t have an RCA port. 

How will you wire the Sonos Port or Sonos Amp to the Beosound system? when the Sonos Port and Sonos Amp uses RCA cables.

A clarification on what you’re trying to achieve is appreciated.

The Aux-to-DIN cables part is easy: Just send a message to Steve at soundsheavenly.com telling him what you want to do.  I think you want “7 Pin Aux Splitter - Dual AUX / Tape input sockets”.  But this relies on you not playing both sources at once: *automatic switching* between two sources for A.AUX on the BeoSound 3000 is the tricky part…  If you want manual pushbutton operation, that’s easy, just type “B&O Aux Expander” into ebay.com.  (There was even a B&O-labeled pushbutton switch, but what’s the point of paying more unless you want that font on the box...)  Also note that since your B&O speakers are Powerlink’ed to your 3000, you could splice in *at the speakers* instead of at the Aux-In on the 3000!  They will power up automatically, but you then need to do volume control for each device with its own remote -- which may be exactly what you want.  This is “Powerlink AUX Adaptor”, available, for example, from oneremote.dk .  There’s an explanation of these various solutions here: https://forum.beoworld.org/forums/t/13168.aspx

That said, here we are on a Sonos forum, so there’s a Sonos-y answer too: Hook up Line-Out on a Sonos Port to your 3000’s A.AUX input.  Then you can turn on Autoplay on the Port’s Line In.  When the local source is off, you are playing the Sonos networked audio outut to the 3000.  *BUT* because you are using a TV and not a turntable or whatever, I think audio delay that happens on a typical Sonos conversion to send audio to the rest of the house will be unacceptable.

Of all the possibilities, the manual switchbox is the cheapest, but I like the idea of Powerlink-ing the speakers to multiple inputs myself, because you only have to pick up one remote (Beo4 or TV) to do the deed.

That configuration will automatically play audio when there is TV audio, however, the Port is not designed to take input from a TV, it’s designed for multiroom audio.  Any audio on the line in side is automatically buffered, which means it can sync the audio with other rooms properly, but it will not be in sync with the video on the TV.  

I’m not that familiar with Beosound, but I believe the others options @tracker mentioned will work out better for you.

Sure, that will work, but only if you’re willing to give up your powered BeoLab speakers. 

Details: Yes, the TV sound via HDMI (assuming your TV has an HDMI ARC output) will come out of the Sonos Amp without delays, and the line-in from the BeoSound 3000 will also auto-play if you configure it that way… but they will play to the Sonos Amp’s speaker outputs (for passive, non-powered speakers)!  Sure, you could get a speaker-to-line-level converter and plug that between the Sonos Amp and the BeoLabs.  But that’s a kludge, worse than the dual PowerLink box.

My suggestion: I guess it boils down to which speakers you got with your Beosound 3000.  If they are the inexpensive 2500’s that sometimes came with the 3000, just set the whole unit aside as a beautiful, separate, vintage stereo to play CDs and radio, and get something better for your TV, whether Sonos or otherwise.  If they are BeoLab 6000, or BeoLab 8000, then get the PowerLink AUX Adapter so you can drive them with either the Sonos Port or the BeoSound 3000, and keep your TV routing thru the BeoSound 3000 as it is now.

[Edit: @Andrew19789 slight change above after your reply, sorry.  Sonos Port direct via PowerLink AUX Adapter or Sonos Port via A.AUX input switch via BeoSound 3000 are still your best bets.  The first is a little more automatic and B&O-ish than the second, but both seem pretty easy, to me.]

(Oops, mis-copied the product name: “Powerlink AUX Expander”.) This is the one that “beoworld people recommend”.  Of course it’s Danish… click on the drop-down “UK/En” flag menu.  I don't own one personally to advise further; search within beoworld.org for more opinions:

https://shop.oneremote.dk/shop/69116-powerlink-aux-adaptor/4154-powerlink-aux-expander/

The front side is shown in the web page.  The back side is shown on the cover of the manual (see link). 

(Note that the output shown is a *single* PowerLink, which connectors carry both left and right signals.  BeoLab 6000s have two connectors, so you’ll be daisy-chaining one to the other, if you aren’t running that way already, connected to your BeoSound 3000.  (The 3000 happens to have two PowerLink output ports, so you might be connected one-speaker-to-each; no biggie, just swap the cable over to serve daisy-chain, and buy a longer one if you must.)  “People say” this model is better than some, because data is is also carried down PowerLink, and when it sees data (supposedly) it switches immediately to that input.)

Close, but not perfect. 

In pictures: Lay a BeoLab 6000 down on its side and look at the bottom plate.  Then you’ll understand.

In words: Each speaker connector, which is a “PowerLink” (per B&O) DIN cable, carries both left and right channels.  Each speaker decides which channel it will play, with a switch R/L.  You will plug one BeoSound 3000 speaker/PowerLink connector into the Powerlink Expander on its input side, and one of your BeoLab 6000s into its output side.  Then you will plug your other BeoLab 6000 into the first BeoLab 6000.  Finally, you will plug your Sonos Port into the other connector on the input side of the PowerLink Aux Expander.

(Specific answers: #1: no, it doesn’t matter. #2: yes. #3: no, it looks like 2RCA->3.5mm #4: yes, same as you already have)

I have a similar set up with Port as you laid out here. Works like a charm.