An exemplary speaker assembly includes an enclosure, a loudspeaker, a sound-guiding channel, and a housing. The enclosure has a receiving chamber and an acoustic chamber. The loudspeaker is accommodated in the receiving chamber. The sound-guiding channel is formed in the acoustic chamber. The sound-guiding channel has a first end with a first opening and a second end with a second opening. The second opening communicates the sound-guiding channel with the surrounding environment. The housing is received in the sound-guiding channel. The housing includes a passage communicating the first opening with the sound-guiding channel. The passage is narrow at a first position of the housing and wide at a second position of the housing.