Quad Stereo is probalby the most unsuccessful sound format of all time...
INTRODUCTION
MONO
STEREO
QUAD
DOLBY STEREO
DOLBY SURROUND
DOLBY PRO-LOGIC
DOLBY DIGITAL
DOLBY DIGITAL-EX
DTS
DTS-ES
MPEG-II
SONY SDDS
THX
TIMELINE

Sound Formats

 

QUADRAPHONIC STEREO

Many of you may not recognize this format, but hi-fi enthusiasts in the 1970's will be familiar with Quad sound. As two channel stereo had been almost universally accepted as the 'normal' sound format for home hi-fi, equipment manufacturers began to look at ways to persuade customers to buy their music centres rather than their competitors machines. Their ill-fated solution was known as Quadraphonic Stereo. The technology involved encoding the sound with four channels - the extra two channels carrying information for two speakers placed in the corners at the back of the room. It was never seen as a home version of the multi-channel stereo used in the cinema, rather an attempt to make the home experience of listening to hi-fi more involving. It never really caught on as developers released incompatible encoding and decoding technology, each claiming to be the best, and confusion arose over exactly what sound the two extra channels would carry. Enthusiasts were more than happy with the now standard two channel stereo and failed to be attracted by Quad, seeing it as more of a gimmick than the next stage of hi-fi development. After a few years of treading water in the early 1970's, Quad finally sank without a trace.