How do you recommend that I electrically ground hifiberry amp?

When I connected raspberry pi to a router via an ethernet cable, the router served as an electrical ground because the router was connected to my desktop computer which was properly grounded.

Now, my raspberry pi is going to connect to the router via WiFi, it is going to lose electrical ground. Without ground, I may hear distortions in speakers.

How do you suggest that I establish the electrical ground for Raspberry Pi?


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