Just one BNC to BNC cable is required and you can run it to any speaker in your setup that has been left isolated - i.e. other the 2 fronts. I chose the centre because it was closest. My 861 has 4 independent SL cables to fronts, centre, rear and sides. I suspect however the comms side of things is effectively bidirectional. In the legacy setups of old you used to have one daisy chained set of serial comms cables passing on the comms commands to the next speaker in the chain (like turn up volume, switch to standby etc). I assume in SL world even although pairs of speakers are indepenantly SL wired from other pairs, these comms commands still find themselves being magic'ed across to all speakers.
I had one of these cheap red/black phono cables lying around that comes with TV's etc. I also had a couple of phono to BNC connectors, so made up my cable that way. You'll be able to source from any local electronics shop.
Only problem I had thereafter as I posted was that MQA to the fronts then got supplemted by unwanted signals to for example the centre. This was because I originally had Trifield as my preferred DSP setting for for Sooloos. As someone subsequently suggested the solution to that was simply to change my setup so that Sooloos on the 861 would deliver Stereo instead.
Rm1: 861v8, 2xDSP7200SE, DSP5200HCSEU, 2xDSP5200, 2xDSP33, MC200, 218, 271, NAD M17, Panasonic DP-UB9000 Blu-ray, Sony VPL-VW790ES projector Rm2: 561, 3x DSP5000 (18 bit) Rm3: 218+Farad PS, 2x SE7200SE Rm4: 218, 2x DSP5200.2 Spares: G61RSL, 3x DSP5000, 2 x DSP33
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