Harman Kardon Onyx Studio 5 Volume Issues

Hi,

I got a Onyx Studio 5 Bluetooth speaker and I have an issue with the volume levels. If I have my Android smartphone connected to it and have the volume level at let's say 3/10, the music is very silent. If I put it to 2/10, I can't almost hear it. If I put it to 4/10 the music is a lot louder than before, almost like 5 levels above. This is very inconvenient because I need something in between these volumes.

Does anyone else have this issue with the speaker or can help me fix it?

Julian