I bought the Powercab second hand, and the cable came with it. The mfr says "Use this cable", and I have the cable, so.....
There's so many people posting here and elsewhere "I did such and such using this or that instead of what I know I should use, and it was working, and now weird stuff is happening! Help me!"
The answer is "Use the right thing!" And the result is "Hey, that worked!"
Yes, I read somewhere that someone used an XLR cable with good results.
As I recall, he'd plugged it into a microphone connected to the Helix mic input and thought he was using the L6 link.
Sometimes I fear for the future of Humankind.