i bought a pa speaker today.
as soon as i plug it in and turn it on (no audio plugged in yet, jut power), the speaker emits a hum, like what you would get from a long run of unbalanced cable. I assumed it was a ground loop, so i slowly unplugged 30+ items in my basement one by one to see if it would go away, but no, still the same hum. I then, using a spare power cable, ripped out the ground prong just to see if that would temporarily fix this problem...but still, i had humming. to make things worse, i take the pa upstairs and use another outlet with a good cable, and there is no hum problem. I CANT figure it out and its a loud enough hum that its drives me NUTS... as you can tell........
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