Hi and welcome to Beoworld! You need to connect the Beolab speakers to either the TV or the BC2300 but not both.  Let's assume initially that you decide to connect them to the BC2300. The Beolink Converter allows you to connect the BC6-26 to the BC2300 so that you can chose to hear TV audio through the BC2300 and vice versa.  To use this, connect the TV by Masterlink cable to the 1611 converter, and then connect a 7-pin DIN to DIN cable between the 1611's AAL socket and the BC2300's AUX socket. Once you have done this, the TV and BC2300 need to be in the correct Option Settings.  You need the TV in V.OPT 1 and the BC2300 in A.OPT 1.  Let me now what remote you have and I will tell you how to set this up. The best way to get the hdmi audio into the BC6-26 is to use an hdmi audio extractor, as explained here: 

Location: Warwickshire, UK

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If as an alternative you connect the Beolab speakers to the TV's Powerlink socket, then you need to add a powerlink cable between one of the the BC2300's Powerlink sockets and the 1611 converter's Powerlink socket.  In this case, you would want the TV to be in V.OPT 2 and the BC2300 to be in A.OPT 0.