Quadraphonic sound

A 4-channel reel-to-reel tape unit from the 1970s, one of the few ways to achieve true 4-channel sound at home

Quadraphonic (or Quadrophonic and sometimes Quadrasonic) sound – similar to what is now called 4.0 surround sound – uses four channels in which speakers are positioned at the four corners of the listening space, reproducing signals that are (wholly or in part) independent of one another. Quadraphonic audio was the earliest consumer product in surround sound and thousands of quadraphonic recordings were made during the 1970s.

单词	Four channel
释义	Four channel 原声例句背诵为王第三册（60课全） In Britain there are four channels, but many people now have satellite or digital TV, offering hundreds more. 英国有四个电视频道，但现在许多人有卫星或数字电视，这类电视可提供上百个频道。英语百科 Quadraphonic sound Quadraphonic (or Quadrophonic and sometimes Quadrasonic) sound – similar to what is now called 4.0 surround sound – uses four channels in which speakers are positioned at the four corners of the listening space, reproducing signals that are (wholly or in part) independent of one another. Quadraphonic audio was the earliest consumer product in surround sound and thousands of quadraphonic recordings were made during the 1970s.
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Four channel

Quadraphonic sound