By the 1950s, record players, as they came to be called, had become a mainstay of many American living rooms. These were “mono,” or one-channel, music systems. With mono, all sounds and instruments were mixed together. Everything was delivered through one speaker.
Stereophonic sound, or stereo, was an important advance in sound reproduction. Stereo introduced two-channel sound, which separated out elements of the total sound landscape and changed the experience of listening.
Audio engineers had sought to improve the quality of recorded sound in their quest for “high fidelity” recordings that more faithfully reproduced live sound. Stereo technology recorded sound and played it back in a way that more closely mimicked how humans actually hear the world around them.
A graphic detail, from an RCA inner sleeve, shows listeners how new stereo technology operates. From the collection of Janet Borgerson and Jonathan Schroeder, Author provided