Ongoing evolution of my efforts. I spent some more time at our gaming location last night, attempting to recreate and then resolve the audio hum I was getting during the last session. At the time, it was very concerning – I had to reduce the gain in all cases to almost silent to eliminate it. Of course, since I forgot to record the session, I am not sure if it was just in the monitoring headphones, or in the actual audio.
I worked to recreate the situation last night, complete with all the microphones, cables, and connections. And despite my efforts, of course there was no sign of the hum.
At this point, I can only assume that it was either temporary, or more likely, my extension cable USB outlet is so poorly shielded as to cause the problem. That was the one main difference – I did not use the extension cable, opting for a USB power bank instead (purely for convenience). If this works reliably, then it is an easy enough solution, plenty of power banks, and they last for more than enough time. And it helps not having another piece in the extension cable.
