DIY wiring of RCA-to-XLR umbilical cable

[Confused]

With the question of protocol unanswered, it is not clear if the proposed Mutec solution would work.  Something like this offers a simpler alternative:

http://www.neutrik.com/en/accessories/ae...nsformers/
http://www.canford.co.uk/Index/110-75-oh...converters

I did talk to Devialet's Mathieu Pernod about the optimum solution to the master companion link.  At first he stated that there was basically no difference between the AES/EBU connection and using RCA, but after more detailed discussion he did advise that RCA to AES/EBU connection with a transformer was the optimum solution.  I'm thinking you could try something like the Neutrik transformer with cheap cables as proof of concept.  If this works satisfactorily, then you could get a decent custom cable made with transformer.

There is a very simple solution of course, link using the RCA to RCA method.  NickB has already advised this works without issue.  Sometimes the simplest solutions are the best?  Although I think personally I would try the transformer method, if only out of curiosity, it would be cheap and easy enough to do.