DAC+ Pro with Raspbian too low output volume

Hello, I have an Pi 3+ with Raspbian OS and the DAC+ Pro. The output is too low with sinusodial sine wave e.g. 50/100/200Hz. At the scope measured at the XLR out I get 600mV.

Alsamixer is at 100%

Any suggestion how to get more volume out of the XLR.? Should be at max level arround 4Vrms, right.?

Thank you.!


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