八声道 is a 术语 used by some to designate an eight-channel 空间 of 声波 It 通常 implies a preconceived plan of 空间 关系 which are 固定 on a 錄/录 媒介 and played back in 表演 over a 系统 in which the eight 通道 are routed to eight 扬声器 on a 固定 one-to-one 基础