They were right, pulseaudio-module-equalizer is buggy: causes random stutters/cracking,…
Found a workaround to get 1. alsaequal working with kodi. Testing this solution now, seems to work without stutters.
The workaround is to add a alsa sink to pulseaudio, so pulseaudio will be piped to alsa.
Then Kodi can be set to use pulseaudio as output.