Master/slave link

[PhilP]

I really don't know. It's just a supposition that the impedance will be higher because the capacitance is low - according to wikipedia, the impedance for a low resistance line is the square root of the inductance divided by the capacitance, so low capacitance gives higher impedance if the inductance is the same.
This may be flawed though, I'm not an expert and I don't really want a thread to appear about this...

I thought Thierry had suggested a 110 ohm cable if it were attached to the AES/EBU on the companion, but maybe I'm mistaken.

Yes, Thierry's suggestion was for RCA-XLR connection. I misunderstood your earlier post, sorry ;