Volume Unreasonably Loud

My volume is way too loud.

I have to have my volume between 0 and 10, out of the possible 100. anything else is way to loud. I'm using regular headphones with no gain, so it's not getting amplified there. I have to set all my different audio sources artificially low in volume mixer so that I can use the windows volume control at anything more than 10. Is there some sort of global volume scale I can use?

Open Volume mixer, playing devices (translated roughly from spanish), select your output device and if there is any ENHANCEMENTS tab, make sure Equalization is disabled.

equalization was already disabled

Why is that a problem my volume control, is normally in the range of 10-20 out of 100.
Some sources are a lot lower level thus the extra margin to turn it up is useful.

You may have to fiddle about in the Enhancements Tab, start with no enhancements.