[alsa-devel] Decibel Levels for Storm Medusa 5.1 USB Headset
superquad.vortex2 at gmail.com
Sat Jul 27 01:30:13 CEST 2013
> >>> I hope this Information helps. I have the Storm Medusa 5.1 USB Headset
> >>> which reports wrong decibel levels to pulseaudio. My Alsa-Info are
> >>> located at
> >>> The Headset is card2 in the above dump.
> >>> My decibel levels-fix
> >>> [DecibelFix Speaker]
> >>> db-values = 1:-30 37:3
> >> How did you define these values?
> > If your headset have windows driver, need to find out which USB chip and
> > look at the datasheet of the chip
> > e.g. cm106l ’s datasheet contain a table of dac volume cortol
> Ok looks like cm6206 is only in newer versions of the headset in older
> (like mine) there is cm106l , maybe there are other chips as well but i
> don't know.
Seem same USB audio id
idVendor 0x0d8c C-Media Electronics, Inc.
Do you find out the audio chip from product spec, user manual or windows
Master volume control by default; per-channel volume control by C-Media
Refer to the function block diagram , dac with volume controls 0 to -45dB
There is a table of dac volume control in linear scale
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