Stereo

Stereo generally refers to dual-channel audio -- sound that contains data for more than one speaker simultaneously. Compact disc audio and some radio broadcasts are stereo.

Stereo contrasts with mono, and also with multichannel audio[?] which can control a larger number of speakers independently, such as the 5.1- and 6.1-channel systems used on high-end film and television productions.

Many people refer to audio players as "a stereo."

See also:

• stereo photography[?]
• Binaural recording