A 扬声器 is a 设备 designed to reproduce 声 It takes an 电子 信号 and coverts it in to 声波 波 共鸣 in the air

The 扬声器 does this through the power of electromagnets the 电子 信号 that travels to the 扬声器 is an ‘alternating current’ it turns on and off This in turn turns the electromagnet on and off which acts to pull the 扬声器 cone back and forth The 速度 at which the current alternates will directly 影响 the 速度 at which the 扬声器 cone moves and the 声波 波 产生