A four-speaker surround sound system introduced in the 1970s that never caught on, primarily because of the recording technologies available at that time. Quadraphonic sound used two front and two ...

The circuit was designed using a four channel amplifier to produce quadraphonic sound: right front, left front, right rear, and left rear Quadraphonic – a sound production term wherein it uses four ...

A lot of the Glastonbury Festival headlines are taken by… well, the headliners, but, as regular visitors to Worthy Farm will tell you, a lot of the most interesting action is happening away from the ...