Airplay volume too low

I have Volumio 3.324 on Raspi 3B without any additional plugins. Webradio and local mp3 files work really well and flawlessly but airplay volume is really low. I have seen this as an issue a few years ago but none of the solutions work for me. I have no dac boards- just 3.5 mm jack. Anyone facing the same issue?

Is the volume set to max on the phone/iPad?

Yes, when set to max I can hear what is being airplayed. Is it the expected behaviour?

Edit: But it is still too low