Comment 19 for bug 1534929

Nevermind point 3. "load-module module-udev-detect use_ucm=0 ignore_dB=1" in /etc/pulse/default.pa is far better solution. The volume may be still extreme loud, but I won't set it over 45%.
From all above I conclude:
1) It's not PA fault, but some default configurations may be altered in pulseaudio. Why not to make ignore_dB=1 default?
2) According to latest comment here: https://chrisjean.com/fix-for-usb-audio-is-too-loud-and-mutes-at-low-volume-in-ubuntu/
On some architectures (amd64) or most motherboards creative and some other cards are too loud, and I should have talks with kernel devs with this problem