If I put my notes here, I might be able to find them again later!
Windows volume control settings in dB.
I suppose everyone has at one point or another adjusted the volume sliders in Windows. The ones that go from 0-100, and you are never quite sure what whether its a boost, or an attenuation, or what.
Some years ago I measured the outputs and inputs using a fixed amplitude .wav file created in audacity and played back through the Onkyo SE-200PCI. I've taken another look at the worksheet I made and I've noticed that the volume settings correspond to very logical, even steps, namely:
100 0 dB
90 -1 dB
80 -2 dB
70 -3 dB
60 -4.5 dB
50 -6 dB
40 -8 dB
30 -10 dB
20 -14 dB
10 -20 dB
or for the mathematically inclined: 20*log(volume/100)
This scale is the same for both the output master volume and the line input, so its probably maintained throughout the operating system.
So now you know.
** note added much later,
My new soundcard, the Asus Xonar Essence STX, as a slightly steeper mapping of the output volume, being -10 dB at 50 and -35 dB at 10.
Some years ago I measured the outputs and inputs using a fixed amplitude .wav file created in audacity and played back through the Onkyo SE-200PCI. I've taken another look at the worksheet I made and I've noticed that the volume settings correspond to very logical, even steps, namely:
100 0 dB
90 -1 dB
80 -2 dB
70 -3 dB
60 -4.5 dB
50 -6 dB
40 -8 dB
30 -10 dB
20 -14 dB
10 -20 dB
or for the mathematically inclined: 20*log(volume/100)
This scale is the same for both the output master volume and the line input, so its probably maintained throughout the operating system.
So now you know.
** note added much later,
My new soundcard, the Asus Xonar Essence STX, as a slightly steeper mapping of the output volume, being -10 dB at 50 and -35 dB at 10.
Total Comments 1
Comments
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Thanks for putting that up, makes sense from my subjective impressions ...
Posted 24th August 2014 at 01:40 AM by fas42