solder gun and speaker

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#1
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Hi Freaks,
When I was trying to solder some wires to a speaker's terminals, I could hear a hum in the speaker. Was that 60Hz frequency hum from the solder gun coupled into the speaker? Does the coil in a solder gun get energized at 60Hz?

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If you're talking about the kind of soldering gun that plugs directly into the wall, the hum you're hearing is from the line frequency, directly influencing the permanent magnet in the speaker.

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Yep,it makes sense. Wouldn't it be cool if on the same lines you could filter solar radiation to an audio frequency and couple it to a speaker?