Hissing comes from the speaker

Hello. I bought 7.2, 00WW_1_270.

I noticed that hissing comes from the speaker.

Hissing is heard when you watch a video on YouTube, listen to music, or just launch an audio application.

The hiss is still distinctly heard when you turn on the notification Salancia and Titan. After the notification is heard, 2-3 more seconds are heard the hiss.

A hiss is clearly audible if done at 10-20% volume.

Does everyone have such a problem?

Is this a marriage or is it the way it should be?

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