Monophonic sound is sound created by one channel or speaker and is also known as Monaural or High-Fidelity sound. Monophonic sound was replaced by Stereo or Stereophonic sound in the 1960s.
Stereophonic SoundStereo or Stereophonic sound is created by two independent audio channels or speakers and provides a sense of directionality because sounds can be heard from different directions. The term stereophonic is derived from the Greek words stereos, which means solid and phone, which means sound. Stereo sound can reproduce sounds and music from various directions or positions the way we hear things naturally, hence the term solid sound. Stereo sound is a common form of sound reproduction.
Multichannel Surround SoundMultichannel sound, also known as surround sound, is created by at least four and up to seven independent audio channels or speakers placed in front of and behind the listener that surrounds the listener in sound. Multichannel sound can be enjoyed on DVD music discs, DVD movies and some CDs. Multichannel sound began in the 1970s with the introduction of Quadraphonic sound, also known as Quad. Multichannel sound is also known as 5.1, 6.1 or 7.1 channel sound.
5.1, 6.1 and 7.1 Channel Sound
- 5.1 channel sound is an industry standard sound format for movies and music with five main channels of sound and a sixth subwoofer channel (called the point-one channel) used for special movie effects and bass for music. A 5.1 channel system consists of a stereo pair of speakers, a center channel speaker placed between the stereo speakers and two surround sound speakers located behind the listener. 5.1 channel sound is found on DVD movie and music discs and some CDs.
- 6.1 channel sound is a sound enhancement to 5.1 channel sound with an additional center surround sound speaker located between the two surround sound speakers directly behind the listener. 6.1 channel sound produces a more enveloping surround sound experience.
- 7.1 channel sound is a further sound enhancement to 5.1 channel sound with two additional side-surround speakers located to the sides of the listener’s seating position. 7.1 channel sound is used for greater sound envelopment and more accurate positioning of sounds.