Development of Hi-Fi microspeakers with a woofer and a tweeter used for mobile phones
Sang-Moon Hwang, Hong-Joo Lee, Ji Hoon Kim, Joong-Hak Kwon, Keum‐Shik Hong, Gun-Yong Hwang · Journal of Applied Physics · 2005
For mobile phones, high performance microspeakers with broader frequency range are essential parts to realize various multimedia functions such as MP3 playback, speaker phones, and 64 poly-harmonic melody. Noting that the operating frequency range of conventional microspeakers ranges from 900Hzto10kHz, that of 400Hzto10kHz for hi-fi microspeakers is required to meet customer demand in a multimedia era. One possible way of achieving this is to integrate two-way microspeakers (woofer and tweeter) within one device sharing not only magnetic circuit but also vibration space. Noting that the characteristics of the microspeakers are a coupled phenomenon of electromagnetic, mechanical and acoustic system, a systematic analysis must be implemented to fully consider the coupling effects. In this article, a hi-fi microspeaker with a woofer and a tweeter is introduced and the sound pressure level is also calculated and compared with the experimental results. Results show the development can be a successful alternative for the high performance microspeakers of a multimedia era.