Audio Hum From Speakers

I’m running Debian 12/Sid image from Lanefu.

I have a constant hum in the audio which can be heard on my speakers. This is with my speaker hooked to the 3.5 mm jack on the indiedroid-nova and the same hum with a USB audio dongle.

It sounds like a ground loop hum.

I’m using the 18W USB-a power supply that came with indiedroid-nova bundle. - I tried a couple of USB phone chargers to see if it was the power supply, but they won’t power the board.

Is this normal (are other people experiencing this hum) or do I have a defective power supply or indiedroid-nova?