White noise/buzzing sound when connecting headphones wireless headphones to anything

Dec 23, 2018
I've bought a pair of wireless headphones, the Sony WH CH700N, and from day one, when the headphoones are turned on and the wire is plugged into them, (not even into a device, just plugged into the headphones) they the start making a soft white nouse sound, and when i turn off the noise canceling they start making kind of an electrical sound that changes pitch. The thing is, when the headphones are plugged in and turned on they have a better audio quality than when they are just plugged in, so i usually do it. I'm not dure of it's normal or not and how can i fix it?
P.S. This thing also happened with my previous headphones, the Sony MDR xb950b1
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