Lumped Parameter Method for Prediction of Sound Absorption Coefficient of Loudspeaker Placed in Closed Enclosure.

This paper presents a comparative analysis of a theoretical lumped parameter model used to compute the acoustic impedance of a loudspeaker placed in closed enclosure , which acts as a low-frequency absorber. The analysis aims to validate the theoretical predictions by examining the system’s mechanical and acoustic parameters. The influence of diaphragm compliance, mass, and damping on acoustic impedance is explored. Additionally, an impedance tube measurement is used to experimentally verify the theoretical results. The methodology, measurement procedure, and laboratory setup are described in detail. Results indicate that the lumped parameter approach provides a reliable estimation for specific frequency ranges, with deviations attributed to non-ideal structural and material properties .