Socalguy

Is this "humming" everyone is talking about the same as the high pitch whistle? My PM Ultra 5.1s started having a very high pitched whistle that starts as soon as you turn them on. I don't hear it in headphone mode, but it drowns out any music coming from the speakers. Have tried checking all of the speaker connections, different power outlets etc, and still no dice. Wondering if this is due to the same "humming" issue?