Abstract
This study presents a novel two-way microspeaker design (SPK) aimed at improving the mid-frequency sound pressure level (SPL) without compromising the overall dimensions. This innovative approach includes a new magnetic circuit design, new diaphragm structures, and electromagnetic-mechanical-acoustic (E-M-A) coupling analysis of two microspeakers (SPKs). First, the E-M-A coupling method is validated on the prototype SPK, which forms the basis for subsequent design iterations. Four types of SPKs, with strategically reduced magnet numbers, are introduced and enhance the force factor of microspeakers. A new diaphragm structure that uses two side diaphragms with varying hardness levels effectively controls the resonance frequencies for each SPK. The SPL results demonstrate that Type 4 with new diaphragm structure exhibits a significant 0.94 dB increase in the mid-frequency SPL compared with the prototype, with minor reduction in the low-frequency SPL. The conclusion turns out the two-way SPKs can be uses as a good approach to improve the mid- frequency SPL.
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