A pair of small 扬声器 designed to be worn directly on or in the 耳 Because these 扬声器 are so close to your 耳 you should be especially careful with the volume 设置 响 声 can damage your 耳 PERMANENTLY!

Each 耳 作品 projects a separate 立体声 通道 left and right This separation and the fact that each 扬声器 is positioned on opposite sides of the head can result in 声像 效果 sounding much more 极端 than they might 声波 on a pair of 扬声器 which are 通常 both positioned in front of you within a 标准 立体声 设置

耳机 can 范围（排列） in 品质 and style with different 种类 being suitable for different purposes Circumaural 耳机 cover the whole 耳 and come in two 种类 Closed back 耳机 best for 錄/录 keep the 声波 contained around the 耳 reducing spillage but potentially inducing some 级 of 相位 cancellation as the 声 reflect back off of the inside of the closed back 开放式 back 耳机 best for 混 allow the 声波 to spill out into the 间 避免 any 相位 cancellation but also allowing other 声 from the local 环境 in