Low output volume and severe distortion with DAC2HD + DSP add-on


I'm using a raspberry pi4 with DAC2HD + DSP add-on with hifiberryOS version 20201213 and dsp add on program version 13.

I have a problem with low volume output, it is roughly half compared to other sources when set to 100% (e.g. chromecast audio, TV etc...), is it possible to increase this?

Also, when the volume is 100% there is severe distortion, however this goes away by reducing volume to ~ 90%. It also disappears when I remove my eq filter (which has a peak gain of +10dB) so I suspect there is some headroom issue in the DSP? How do I solve that? 



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