AMP 100 +DSP -> noisy when playing nothing

as User Jo So January 26, 2021 21:09 stated me as well is confronted with a noisy AMP 100 when not playing music
Setup is: AMP100 + Raspi 3 + dsp board; hifiberry os installed; only squeezeplayer activ; steering via ipeng; logitec media server on a NUC; several players through the house.

i tried as well various power supplies on diffent power outltets - nothing changed 

Is this a software problem or is it the hardware of the Amp100?


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