Ground loop with active speakers

I’ve purchased a Dac+Dsp to use with my B&O Beolab 8000 active speakers and every time I power the system on there’s quite an audible buzzing/humming from the speakers and they won’t go into standby as there’s a signal going to them all the time from the dac. Is there a solution to this? They don’t buzz when using my audio interface to play through them, only when using the raspberry/dac setup. Thinking it might be a ground loop thing but not sure how to ground the raspberry (using the original RP usb power supply)


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