[alsa-devel] Verifying mixer dB data/Invalid dB data from USB cards, especially Aureon 5.1 MkII

[Jaroslav Kysela]

On Tue, 16 Feb 2010, James Courtier-Dutton wrote:

> I guess a good start would be what digital values should create what
> voltages on the line output?
> One can then at least get the 0dB point set right.

It seems that I have to buy a precise voltmeter or good digital 
oscilloscope to get these results :-) Anyway, the voltage levels 
expressions are described nicely here:

http://en.wikipedia.org/wiki/Decibel