Thank you for all the feedback.
I'm using a custom set of speakers design by Clearwarve. The speakers have performed without issue, and I swapped speaker cables to cause the hum to move.
It is only in one channel of the amplifier. Not both. I plugged the amplifier into a different power circuit and the issue is still there. I have played this setup with decent volume before and have never had issue.
It was only after I ran the setup with the attenuator in place that the hum developed and now won't go away.
Any reason to believe that there was some DC offset being carried on the positive side that may have done some damage?
I'm using a custom set of speakers design by Clearwarve. The speakers have performed without issue, and I swapped speaker cables to cause the hum to move.
It is only in one channel of the amplifier. Not both. I plugged the amplifier into a different power circuit and the issue is still there. I have played this setup with decent volume before and have never had issue.
It was only after I ran the setup with the attenuator in place that the hum developed and now won't go away.
Any reason to believe that there was some DC offset being carried on the positive side that may have done some damage?