| 主权项 |
1. A tunable earphone, comprising:
a speaker for making sound; a shell receiving the speaker and defining a resonance cavity therein, the shell having a top thereof recessed downward to form a receiving cavity, a supporting plate being formed at a bottom of the receiving cavity, a damping vent being opened in the supporting plate to connect the resonance cavity with the receiving cavity; and a tunable element rotatably and removably mounted on the shell, the tunable element defining a through hole passing therethrough and aligned with the damping vent of the shell, a damping plate being integrally molded on a bottom of the tunable element, the damping plate being located in the receiving cavity and against the supporting plate to separate between the damping vent and the through hole for smoothening the frequency response of the sound pressure level in the resonance cavity while the speaker making sound. |
