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The damage of this mid-power MOSFET surprises me. Audio circuit is probably consumes just a few tens or hundreds milliamps at most.

Yet it has a drastic crater-like dent in the IC enclosure. That tells me it was a voltage surge or current spike.

The hypothesis of entering a linear region caused by a random software glitch producing an unconscious PWM on a filter slope sounds plausible as well. But that crater-like dent says that the real cause might be way more intensive than that.

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