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Audio Issue

I’m a bit lost if I’m honest.

I have a dsp to control my car system: pioneer deq-1000s. Connected through original Connectors with the car. It has the option to plug your phone directly by usb. When using this option everything works perfect. 

But when I would use the hifiberry dac2 pro directly to the dsp I got clipping. I think it could be a ground problem. I got the pi powered with dc dc converter with +- connected and capacitor.
Maybe grounding the hifiberry? But how?

Anyone tips?

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