Stereo-4

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Stereo-4, also known as EV (from Electro-Voice) or EV-4, was a matrix 4-channel quadraphonic sound system developed in 1970 by Leonard Feldman and Jon Fixler. [1]

Contents

The system was heavily promoted by RadioShack stores in the United States, and some record companies released LP albums encoded in this format. It was the first commercial quadraphonic sound system for LP records. [2]

Development

The original EV system was compatible with the Dynaquad DY system, and is related to Sansui's QS Regular Matrix system. The EV and QS records are very close to each other—it would take an expert to tell them apart by ear. [3] EV decoders were sometimes used to produce pseudo 4-channel effects from 2-channel stereo recordings.

In 1973 Electro-Voice signed an agreement with Columbia/CBS Records to build a new universal decoder that could decode both SQ and EV records with good results. It could even decode QS records—again, with good results. [4] EV later suggested the same coefficients for an encoder, but no records were ever produced with the so-called EV Version 2 System. EV more or less disappeared after the SQ Stereo Quadraphonic system was introduced by Columbia/CBS Records in the United States.

Surround Matrix

EV used different sets of coefficients for encoding and decoding. [5] Most other systems have decode coefficients that mirror the encode coefficients. Therefore the EV Stereo-4 matrix was something in between a 2-2-4 derived system and a 4-2-4 matrix system.

Stereo-4 encoding matrix [5] Left FrontRight FrontLeft BackRight Back
Left Total1.00.31.0-0.5
Right Total0.31.0-0.51.0
Stereo-4 decoding matrix [5] Left FrontRight FrontLeft BackRight Back
Left Total1.00.21.0-0.8
Right Total0.21.0-0.81.0

Records

Partial list of LP records released with EV encoding. [6] [7]

The Ovation Records label initially used the EV or Stereo-4 matrix, but later changed to QS Regular Matrix. [9] [10]

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References

  1. ↑ Gross, Mike (December 12, 1970). "Electro-Voice Bares Stereo-4 Decoder Unit". Billboard. pp. 1, 8.
  2. ↑ Robinson, Larry. "Surround Sound History". MidiMagic. Retrieved 2023-01-16.
  3. ↑ Feldman, Leonard (1973). Four Channel Sound (1 ed.). Indianapolis Indiana: Howard W Sam's. pp. 44–47, 70. ISBN   9780672209666.
  4. ↑ Feldman, Leonard (1973). Four Channel Sound (1 ed.). Indianapolis Indiana: Howard W Sam's. pp. 73–77. ISBN   9780672209666.
  5. 1 2 3 Feldman, Leonard (1973). Four Channel Sound (1 ed.). Indianapolis Indiana: Howard W Sam's. pp. 44–49. ISBN   9780672209666.
  6. ↑ Anderson, Mark (2023). "Quadraphonic Discography "Classical Recordings - Complete List"". The Surround Discography. Retrieved 2023-01-12.
  7. ↑ Anderson, Mark (2022). "Quadraphonic CD Discography QUAD COMPACT DISCS". The Surround Discography. Retrieved 2023-01-12.
  8. ↑ "Compatible 4 Channel Quadraphonic Sound (Vinyl, US, 1971)". Discogs. Retrieved 2023-01-12.
  9. ↑ Robinson, Larry. "Quadraphonic Systems". MidiMagic. Retrieved 2023-05-28.
  10. ↑ Scheiber, Peter (April 1971). "Four Channels and Compatibility". Journal of the Audio Engineering Society. AES. 19 (4): 267–279.
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