Frequency response simulation of the hybrid dual driver earphone using equivalent circuit model

Abstract

By combining the multiple drivers into an insert earphone, the special filtering of hybrid dual drivers by earphone structure design can be applied to increase efficiency and the overall output level. In general, the back of the earphone structure lays a balanced armature driver for the mid to high frequency reproduction and a dynamic driver in front cavity creates deeper bass. For this distinctive structure of the earphone, this study proposed a frequency response simulation model using the equivalent circuit model. For the sound transmission between the two ports' structure, the correction factors for obtaining the transmitted impedance of special filter are proposed. The simulated responses shows that a good comparison between the measured result and the equivalent circuit simulation. As a result, the study has significant capacity to estimate the desired frequency response of a hybrid dual driver earphone.By combining the multiple drivers into an insert earphone, the special filtering of hybrid dual drivers by earphone structure design can be applied to increase efficiency and the overall output level. In general, the back of the earphone structure lays a balanced armature driver for the mid to high frequency reproduction and a dynamic driver in front cavity creates deeper bass. For this distinctive structure of the earphone, this study proposed a frequency response simulation model using the equivalent circuit model. For the sound transmission between the two ports' structure, the correction factors for obtaining the transmitted impedance of special filter are proposed. The simulated responses shows that a good comparison between the measured result and the equivalent circuit simulation. As a result, the study has significant capacity to estimate the desired frequency response of a hybrid dual driver earphone.