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I have an onbaord-Soundchip:

Intel Corporation 82801H (ICH8 Family) HD Audio Controller

Codec: Realtek ALC883

Codec: Realtek ALC268

The driver snd_hda_intel is installed and everything works "fine". But the output is really bad.

It sounds like an "old radio." In my "Windows-times" the sound was way better.

I play also with alsa mixer. Nothing became better. Alsa-version: 1.0.24.2

Is it possible to increase its quality?

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You can try the global equalizer for pulseaudio. From a terminal or ALT+F2 run

sudo add-apt-repository ppa:nilarimogard/webupd8 && sudo apt-get update && sudo apt-get install pulseaudio-equalizer

It is located in Multimedia menu

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