Well I am sure that dCS might say that if you wanted a Bartok with a transport then they have a product called Rossini Player which offers other advantages too!
Esoteric’s point that both ( meaning either) 50 ohm and 75 ohm cables can be used with their transports kind of goes along with my expectation. However Andrew does not agree and says that you must only use 75 ohm with the Bartok.
I remain unconvinced because if one troubles to read the spec. sheets for Neutrik ( one of the most prestigious connector manufacturers) until very recently they specified their BNC connectors as 50/75 ohm. Only recently have they respecified them as 75 ohm. However we are looking at impedance not resistance. The calculation of impedance involves a frequency component. BNC connectors are actually connectors for the video not audio world. Hence Neutrik’s measurements are in the GHz range . So they are 75ohm @ xGHz. The dCS clock output is in the KHz range so the impedance at that frequency range is unspecified/unknown, for the Neutrik connectors at least.
Further I have used dCS clocks since the Verona and am now on my third ( a Vivaldi). All sound quite different using the same cables into the same DAC. Using different cables with the same clock and DAC also provides a different result even where all cables/connectors are specified by the manufacturers to be 75 ohm. Are their specs to be relied upon? Without a test laboratory to verify one way or the other I remain sceptical ( especially as I know of more than one cable manufacture who use the same cable for both 75 and 110 ohm cables. At least one company uses a different colour sheathing for each to give the impression of variety).
So in practice it may or may not make a a difference and any difference may or may not be beneficial. Without a test laboratory I doubt that you can l know what you are really using from a technical view aside from the manufacturer’s assertion which , in many cases is unreliable. So, IMO suck it and see.