How to remove noise in headphones during playback?

Question

Audio

I bought Sennheiser PX 100 II headphones. Music quality is excellent. But when watching movies, for example, noise is clearly audible in sound pauses. I also watched a webinar now - noise is also heard behind the voice. On the old cheap Panasonic, this noise was also - but 2 times quieter and did not irritate. Is there any way to get rid of this noise?
The non-existent microphone turned off, the line input too - no change.
In the absence of an audio signal, there is no noise; when scrolling through the pages of sites, there is also no noise.
I connect to the motherboard, not to the front panel
Built-in audio card Realtek ALC887

Answer 1

In audio breaks? like microphone hiss? adjust the equalizer by removing low frequencies. Or listen to high-quality sound.
In the absence of an audio signal, there is no noise; when scrolling through the pages of sites, there is also no noise.
- which means that you have no problems with the ground on the motherboard.

Answer 2

Yes, like the hiss of a microphone. Removing frequencies helps a little.