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As relates to audio, resonance occurs in mechanical devices such as loudspeaker drivers and microphone diaphragms. In a speaker driver, the mass is the cone with its attached wire coil, and the spring is the foam or rubber surrounds that join the cone’s inner and outer edges to the metal frame. The same applies to microphone diaphragms and phonograph cartridges. Most musical instruments also resonate, such as the wood front and back plates on a cello or acoustic guitar and the head of a snare or timpani drum. Air within the cavity of a musical instrument also resonates, such as inside a violin or clarinet.


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So even MIC can have resonance, causing mistakes in measurements.