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

Florian Faber faber at faberman.de
Tue Apr 15 05:52:13 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.

Consumer levels are -10dBV while pro audio levels are +4dBu. And you 
have to be more specific what to measure.

How about this: You do what you want with the consumer boards, and leave 
the pro guys alone. Pro drivers are not 'broken' if they don't 
implement such a 'feature', they are pro drivers.

Machines can do the work, so people have time to think.
public key 6C002249          x-hkp://wwwkeys.eu.pgp.net

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