Analysis and application of zeolite in microspeaker box

Recently, miniaturization has become a hot topic in microspeaker research and has attracted considerable attention. However, the acoustic quality of microspeakers-evaluated in terms of the sound pressure level (SPL)–declines if their dimensions are reduced. This study discusses the application of zeolite in the microspeaker box without causing a change in speaker dimensions. The equivalent circuit method and Langmuir adsorption isotherm have been used to analyze SPL of the microspeaker box. Based on the analysis results obtained in this study, microspeaker samples have been manufactured and their effectiveness has been experimentally verified. Simulation and experimental results reveal that the zeolite can improve SPL by approximately 3.5 dB over a frequency range of 100–1000 Hz.