| Mackie 1801 Subwoofer makes big banging loud noises occasionally.
If I leave my Mackie Sub on for a couple of hours it starts making horrible loud noises. It starts off sounding like someone knocking at the door. After a while it turns into a solid note. It's full volume regardless of the volume knob position and the "thermal" light comes on every times the noise happens.
Any clue what this could be?
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