HDMI ground loop problem

Why is my speaker buzzing? Is it a ground loop? How can I fix it?

Ground Loop Noise Eliminator Only Eliminate the Hum Generated by the Common Ground Line Buzz Eliminator Plug-In Common Ground Line Hum Eliminator Noise Canceller

4 Effective Ways to Eliminate Ground Loop Hums | SC&T

Pyle Compact Mini Hum Eliminator Box - 2 Channel Passive Ground Loop Isolator, Noise Filter,AC Buzz Destroyer, Hum Killer w/ 1/4" TRS Phone,XLR Input/Output, Uses 1:1 Isolation Transformer

2 Packs Ground Loop Noise Isolator for Car Audio/Home Stereo System, Ground Loop Isolator with 3.5mm Audio Cable

Fluke 1630-2 FC Earth Ground Clamp