When I connect the monitor to my computer via HDMI, the speakers start to hum loudly. I listen to music while working at my drafting table, so this is a real annoyance. I bought this Ebtech Hum X filter and plugged the monitor into it instead. The hum was instantly completely cancelled.
https://www.amazon.com/Ebtech-Hum-Ground-Voltage-Filter/dp/B0002E4YI8