Headset buzzes with wired controller only

This sounds like a bad earth or dry solder joint on your wired controller head set socket.

Or maybe there is dust and other debris inside the socket, try spraying a can of "computer duster" into the socket to give it a good clean and go from there.

Have you got a friend who has a wired controller you could borrow just to test if the X12's buzz with them too?

Let me know how you progress with this and i will try to assist you more if needed.

Borrowed another controller, same thing. I've been asking around to friends online as well and I've found 2 others with the same problem. Wireless works fine for all 3 of us, wired not so much. No one seems to know how to fix it besides just using a wireless
though.

I prefer wireless controller and wired headset, but I do not recommend using a wired controller and a wired headset. Some headsets will make a weird buzzing noise when plugged into a wired controller. And also, same goes for plugging your wireless controller
into your console to charge a battery pack.

Basically, the noise is coming from the electrical current running through the controller due to it being wired into the console directly to charge a wireless controller or allow to maintain connection for a wired controller. Unfortunately,
depending on the headset you are using, this buzzing will not go away. In my experience, the only headset I own that does not buzz while I am "wired" into my console are my 100% wireless Turtle Beach 800X Elites. I have the Turtle Beach XO-1, XO-Seven Pro,
800x Elite, Astro A40 and the standard Microsoft Headset (black). As I said, the only ones that don't buzz are the 800 elites because they plug into the console via USB and Optical. All others plug into the controller in one way or another.

Basically, the noise is coming from the electrical current running through the controller due to it being wired into the console directly to charge a wireless controller or allow to maintain connection for a wired controller. Unfortunately,
depending on the headset you are using, this buzzing will not go away. In my experience, the only headset I own that does not buzz while I am "wired" into my console are my 100% wireless Turtle Beach 800X Elites. I have the Turtle Beach XO-1, XO-Seven Pro,
800x Elite, Astro A40 and the standard Microsoft Headset (black). As I said, the only ones that don't buzz are the 800 elites because they plug into the console via USB and Optical. All others plug into the controller in one way or another.

Ah got it. So basically my only option here is to get a pair of wireless headphone to eliminate the buzzing. I'll definitely look into that to see what i can afford. Thanks for the help!