US Patent 10321220 Earcushion with acoustic tube

An earcushion with acoustic tube, comprising an earcushion body; the earcushion body is provided with a front acoustic cavity of speaker, the front acoustic cavity of speaker is provided with an acoustic tube, one end of the acoustic tube is arranged in the front acoustic cavity of speaker; the other end is connected with a resonant cavity, the volume of the resonant cavity is much greater than that of the acoustic tube, the resonant cavity is communicated with the outside atmosphere, the linear amplitude of the speaker vibration system may be increased and the system power may be improved, it can also improve the loop feedback environment.