Low volume on hifiberry digi pro

Hi guys,

I have Raspberry pi 3b + with HifiBerry Digi Pro hat on it connected to dac. Im using Spotify Connect for Music.

My problem is that volume level is very low compered to my old streamer and cd player with digital out. When switching to AirPlay volume level back to normal. Why? How to fix that? The difference is huge - on my amp volume level with old streamer set to 25 is „party” loud. With volumio is like light mis volume listening. And Music sound flat, compressed.