Help fixing a computer sub

Random Name 33 said:

I have a 2.1 subwoofer set for my computer. It's a sub and two speakers. The speakers work fine. The other day, I heard a buzzing and then an electronics smell. The sub no longer works, but the speakers do.

I took it apart, tested the fuse, checked the resistance of the speaker, and those all work fine. I don't know what else to check. The capacitors all look fine, but the 'electronic smell' when it stopped working makes me think of a blown capacitor.

What's the next step?

Thanks!

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