Quadrophonic refers to a system of sound reproduction that uses four speakers or channels to produce a surround sound effect. Other synonyms for quadrophonic include four-channel, four-track, and surround sound. These terms are often used interchangeably with quadrophonic, especially in the context of audio systems and recording technology. In addition to these specific synonyms, there are also broader terms that describe similar concepts, such as multichannel and immersive sound. These terms highlight the importance of using multiple speakers or channels to create a more immersive and realistic audio experience.