So if your "loud mic" works (I assume you have a WS420) that tells me the link between it, the amp, and amp-speakers is fine. If the speakers or amp were damaged to the point of not playing music I wouldn't think the mic would work either. Might want to try looking at the path the music takes to your EQ. You may have a bad cable, HU, mobile device output, or perhaps the WS420 input. I'm not sure how the circuity works on them, but I would guess the mic is separate from the main and aux inputs. This does not sound like a speaker issue!
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