The Line In/Out jack is used for an equalizer (or similar) between the 7000's preamp section and its amplifier section.  Your photo shows the factory-installed crossover plug, which you should leave alone.  (If it were removed you would get no sound out your non-powered speakers.) In your case, I would use the Tape 2 jack, just because it's easier to put your fingers on.  The usual problem is that someone gives you a Line-In RCA->DIN-8 cable rather than the Line-Out cable -- just the wrong pins hooked up.  For this reason I tell folks to buy a Tape-In-AND-Out cable even if you don't need it -- so you can listen to test which plugs are the inputs and use the *other* two!  I bought one on amazon, ASIN# B00M0FXR8A, less than $10.  Also a forum sponsor (scroll down) sells cables, and guarantees you'll get the correct one if you order just Tape->Line-Out!

Awesome. SO helpful. Thank you! I did try the line in/out and it unfolded exactly as you said. I'm sure I did buy the wrong cable. This is the one I bought: CablesOnline 6ft 7-Pin Din Male to 2-RCA Male Professional Premium Audio Cable, Black for Bang & Olufsen, Naim, Quad.Stereo Systems (BO-2706K) https://a.co/d/ctESyOs thanks!!

Hi, This is the cable you need, it connects to either the Tape 1 or Tape 2 socket of the Beomaster to give you 2-way music between the B&O and the Sonos systems (please note that this link won't work until Monday morning, as my site is closed for maintenance today):- https://soundsheavenly.com/bang-olufsen/154-2336-5-pin-din-to-4-x-rca-input-and-output-cable-for-bo-naim-quad.html#/2-length-1m Please ask if you need any further help! Kind regards, Steve.

Thank you! You guys are amazing. I was just scrolling through your site to find the right cable and was going to send you a message. You made it easy for me! I'll order this week. Thanks!! Gerry

Thanks Gerry, Please ask at any time if you have any questions. Kind regards, Steve.

Dear Beoworld Teammembers I would also like to connect my Beomaster 7000 to a Sonos Connect. I would like to use the connector I found in Switzerland. Can somebody tell me if this connector could work as well? Thanks in advance ;)