Beocreate 4 and Raspberry OS, maximum volume is much too low

I would like to operate the beocreate 4 with raspberry os and 4 ohm boxes.
The maximum volume, however, is far too quiet and does not even reach room volume.

When I install Hifiberry OS the volume is ok, but the system is unusually slow and nothing for me.
What can I do? I do not find anything.
Please help!


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