Originally Posted by MerlinWerks
|Unfortunately kmixer changes the bits in volume control stage even if the volume is set to 100%.
I would like to read more about this, what is your point of reference.
I agree . At least in Win 7 system mixer does definitely change sound stream at 100% level. And my point of reference is my own ears
Recently I'd been listening E.S. Posthumus's UNEARTHED (2001) losless rip and had unexpectedly heard clipping clicks
I'd been using foobar via DS and all digital volume controls were set at 100% / 0.0 dB (no EQs or enhancers).
I'd easily found that lowering volume in system mixer or player both removes clicks, so problem is not in bad, clipped record.. To prove this i'd opened wave made out of source APE in editor and it had not found any clipping. So record is OK (but must notice it has peak levels of -0.1dB that's why it had helped to pay attention to problem!).
I was almost sure that source of problem is windows mixer, and had tried WASAPI. No clipping at 100% volume! So, windows mixer at 100% does not pass bitstream "as is", instead it amplifies volume! And that's why -0.1 dB peaks became higher than 0.0dbFS and had turned out to clipping
After I had played with foobar's and windows settings i found that 1) if windows volume is set to 100% then clipping removal level is -1.5 dB in foobar, and, vice versa, 2) if foobars volume is 0.0dB, windows volume must be set to ~85%.
And finally i'd tried to reset all sound settings via Creative Control Panel, and i believe, had found more exact value. CCP sets volume to 87-88% by default. Why 87-88? In system tray tooltip it is shown as 88%. In device properties - 87%... But anyway, if use average (87,5%) it is equivalent of -1.16dB. I'd set foobar's volume to -1.2 dB and still had heard NO clipping
(and at -1.0 dB it had appeared again).
So, seems like "neutral" volume control in Win7 is about 87,5% and at "100%" it really increases volume by ~1.2 dB. (But maybe exact numbers can depends on soundcard?..