There are several synonyms for "quadra phonics", including multichannel sound, surround sound, and 4-channel audio. Each of these terms refers to a system of audio playback that utilizes multiple speakers to create a more immersive and realistic listening experience. While quadra phonics was popular in the 1970s and 1980s, advances in technology have led to the development of more sophisticated surround sound systems, including Dolby Digital, DTS, and Dolby Atmos. These newer systems offer even more channels of audio and greater precision in sound placement, allowing viewers to feel as though they are really part of the action on screen.