This lecture covers the measurement and calculations of Thiele Small parameters for loudspeakers, including the electrical impedance, force factor, and volume of air equivalent to the suspension. It explains the significance of parameters like Qes, Qms, and Vas, and demonstrates methods for determining these values. The lecture also discusses the impact of added mass on speaker performance and the importance of accurate measurements for quality and frequency response. Various measurement techniques and their applications are explored, providing a comprehensive understanding of speaker characterization.