DIY wiring of RCA-to-XLR umbilical cable

[ogs]

rafal123 - have you considered using an active S/P-DIF to AES converter, with an impedance-matched balanced cable?  Maybe that might work better over the distance you need.  Something like the Mutec MC-1.1+ might do the job...possibly a bit of over-engineering, but the cost is not too high (compared with "audiophile" cables, anyway).  Might be worth having a chat with Mutec and asking them what they think; I've found them very responsive and keen to help.

That is a brilliant idea! I have always found the lack of a dedicated (and proprietary) connection between Master and Companion a problem. Thumb's idea may actually solve this problem! A short RCA-RCA from Master to Mutec (maybe the one included with mono amps) and a long XLR-XLR from Mutec to Companion. Let's hope someone will try this and report back their findings to the forum.