stereophonically

Stereophonically is an adverb that describes the reproduction of sound or other signals through two or more independent audio channels, so as to create the illusion of sound being heard in three dimensions. This effect is commonly achieved in stereophonic sound systems, often referred to as stereo, by using two or more microphones to record or transmit sound, and then reproducing the sound through two or more speakers or headphones. The listener's brain then integrates these separate signals to perceive a spatial arrangement of sound sources.

The term "stereophonically" implies the use of this technique. For example, music played stereophonically will often have instruments or vocals placed in distinct positions within the perceived soundstage, creating a sense of depth and width. This contrasts with monophonic sound, which uses a single channel and presents all sounds from a single point. The development of stereophonic recording and playback technologies revolutionized the audio industry, offering a more immersive and realistic listening experience. This method is now standard in music recording, film sound, and many other audio applications.