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This lecture covers the electroacoustic transduction, focusing on the electromechanical transduction and the mechanical and electrical components of loudspeakers. It explains the system modelization, network elements, and resonant frequencies of vibrating systems. The lecture also delves into the mechanical and electrical impedance calculations, transfer functions, and the behavior of vibrating membranes. Additionally, it discusses the mechanical-acoustic system, acoustic radiation, and the equivalent diagrams describing loudspeaker operation. The presentation includes detailed descriptions of vibrating membranes, peripheral suspensions, and the loudspeaker motor. The lecture concludes with the analysis of acoustic and mechanical elements in the loudspeaker system.