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#1 2022-11-19 14:26:25

Registered: 2021-03-06
Posts: 3

What should PCM db gain level be?

Hi all. I have a headset with external DAC. With its own software, on Windows, everything is fine.

On Arch, if I select Analog Output for Master audio, everything is also fine, becasue AFAIK on analog output we don't use the external DAC. However, on Digital Output, the sound is extremely low. I found that, on alsamixer, there is a PCM dB Gain setting, which is automatically set to -18.00dB. When I set this to 0.00dB, the sound level returns to normal.

Is there a advantage to set this dB to negative levels like -18 or should I keep it at 0.00dB?


#2 2022-11-21 15:11:53

From: London
Registered: 2014-02-20
Posts: 6,997

Re: What should PCM db gain level be?

Digital outputs should be set to 0dB. Lower settings worsen the dynamic range & signal:noise ratio.

Last edited by Head_on_a_Stick (2022-11-21 15:12:29)


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