My bookshelf speakers have hum that comes and goes with a decrease in volume at the same time. I opened them up to have a look and there is an obviously burnt resister. Tracing out the components to a diagram and matching it to a diagram from the op amp spec sheet. It has the resister and capacitor labelled as being for frequency stability which maybe would cause a hum?

The questions are: why did they burn out (it's both left and right sides) and are they the only broken parts?

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