Because the interface produces looseness, it will lead to poor contact with the SD card (U disk), thus affecting the normal playback of music. So if you find that the player appears music is not smooth, card card stops with murmurs, we first check whether the interface is loose, found that there is a loose situation, to repair in time.
Speaker refers to a device that transforms audio signals into sound. In layman's terms, it means that the speaker host box or subwoofer box with its own power amplifier, the audio signal amplification process by the speaker itself to play back the sound.