DAC Pro low output to Yamaha YAS-306

I've installed HiFiBerryOS  into a RPi 4 with DAC Pro, and connected the output to the analog input of a Yamaha YAS-306 sound bar (in order to get more robust playback from Logitech Media Server). But the volume is very low, even though the setting in the HiFiBerryOS interface is at 100%. Is there any solution for this?


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