[alsa-devel] internal mic boost: how much is too much?

[Oleksij Rempel]

Hello all,

i have two laptops with internal dmic, each of them has 3 step mic
boost. One step 12 dB. The third step seems to me useless, since it give
more noise then sound.
I know there is code in patch_reatek.c to disable two steps.
But before i provide some patch, it will be interesting to know, how
much noise is too much? What is the best way to measure it?
Do i need some tools like this?
http://www.conrad.de/ce/de/product/100804/VOLTCRAFT-SL-100-Schallpegel-Messgeraet-Laerm-Messgeraet-315-Hz-8-kHz?ref=list

-- 
Regards,
Oleksij