Is your stereo powered by the house batteries?
If it is, it should be located near the source so that it can protect the wiring to the stereo. If the fuse panel were located by the stereo, it could not do that.
But with Thor, who knows if they are using accepted practices or not.
I agree that it is unlikely that the microphone caused the fuse to blow, unless the mic wire is grounded on one side, especially if the mic is powered (some types of mics are).
Sometimes mic cables are shielded and grounded since they are low level devices as this can prevent stray interference in noisy electrical environments, such as near an automotive engine.
Again, speculation on my part.
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