[jdandy]

Originally Posted by For The Love of Music

I recently started hearing the hum coming from my preamp, DAC and streamer/server.

My system sits on a dedicated 20 amp circuit installed on a low use panel.

Of course this is driving me crazy!

Any thoughts on the meter or the home across the street?

Ed.......Just a suggestion, but you might want to check that the main panel bond (the connection between the ground bar and the neutral bar) is tight. This bond is sometimes done with a screw through the neutral bar to a threaded hole in the panel enclosure. The screw is often green in color. The sub-panel you are using to feed your 20 amp dedicated circuit should not have a bond (the connection between the ground bar and the neutral bar) installed, but should have a ground wire from the sub-panel ground bar back to the main panel ground bar. Bonding the neutral and ground should only happen at the first point of disconnect, typically the panel with your main breaker. Also, check that the ground and neutral wires that feed your sub-panel are tight on both ends. Finally, check that your main ground connection in your service panel is tight at the panel and the ground rod outside. In addition, you may want to look at the utility transformer to be certain there is a ground installed between the transformer neutral and a ground rod at the base of the pole. Don't mess with the utility power connection at the ground rod, just check to be certain it is in place and secure.