Using SPDIF cables over XLR in FM3

Hi Fellows!
Need some help.
Tried to connect my FM3 to my Presonus Studio 192 using SPDIF (digital audio RCA type) cable. It worked, but there is some kind of noise in the background. The sound reminds me vibration that comes from the strings. It's crazy. When I use XLR cables (XLr to XLR) from FM3 to audio interface, this sound is not present.
What's wrong? Can the cable I am using be the guilty?
I saw some posts related to SPDIF over XLR cables. And they are correct, because FM3 and audio interfaces are sharing digital information. It's not necessary AD/DA conversion.
Thanks amy help.
 
I couldn't get any Info on this from this forum, tried for a few weeks but the questions weren't answered, I will be poking my head in here to see if you have better luck
 
Make sure your audio interface is set to 48 kHz, 24 bit. Fractal gear is fixed at that sample rate and bit depth.
 
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