HifiBerry DAC+ Light - CAR Amp

If i connect the HifiBerry DAC+ Light RCA's to the car amp RCA input ports wil this work?

Do i still need a Pre-Amp?
Cause i tried connecting the RBP2 3.5mm Jack to my car amp en the sound was terrible.
Then i connected it to the internals of an older head unit. 
This works but i can hear static when using the touch screen etc.

Thanks for the help!


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