[alsa-devel] What does 0dB refer to? (Logitech USB Speakers)

John Rigg aldev at sound-man.co.uk
Tue Apr 15 15:12:03 CEST 2008

> On Monday 14 April 2008 23:07:22 James Courtier-Dutton wrote:
> > The aim of the dB values in the ALSA mixer is this.
> >
> > For Playback:
> > Set all the mixer controls to 0dB.
> > Send a sample digital signal from the CPU to the sound card.
> > The measured analog signal on the line-out should be the same for ALL
> > sound cards.

The dB setting in a mixer refers to gain, not level.
Expecting the same absolute level from pro and consumer
sound cards at the same gain setting is a little ridiculous.
If I set a control at 0dB I want just that: 0dB gain.


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