Stereo-4, also known as EV (from Electro-Voice) or EV-4, was a

matrix Matrix most commonly refers to: * ''The Matrix'' (franchise), an American media franchise ** ''The Matrix'', a 1999 science-fiction action film ** "The Matrix", a fictional setting, a virtual reality environment, within ''The Matrix'' (franchis ...

4-channel

quadraphonic sound Quadraphonic (or quadrophonic and sometimes quadrasonic) sound – equivalent to what is now called 4.0 surround sound – uses four audio channels in which speakers are positioned at the four corners of a listening space. The system allows for th ...

system developed in 1970 by Leonard Feldman and Jon Fixler. The system was heavily promoted by

RadioShack RadioShack, formerly RadioShack Corporation, is an American retailer founded in 1921. At its peak in 1999, RadioShack operated over 8,000 worldwide stores named RadioShack or Tandy Electronics in the United States, Mexico, United Kingdom, Austra ...

stores in the United States, and some record companies released LP albums encoded in this format. It was the first commercial

system for LP records.Surround Sound History
/ref>

Development

The original EV system was compatible with the Dynaquad DY system, and is related to Sansui's

QS Regular Matrix Quadraphonic Sound (originally called Quadphonic Synthesizer, and later referred to as RM or Regular Matrix) was a matrix 4-channel quadraphonic sound system for phonograph records. The system was based on technology created by Peter Scheiber, but ...

system. The EV and QS records are very close to each other—it would take an expert to tell them apart by ear. 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. 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. 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.

Records

Partial list of LP records released with EV encoding. *Hollins and Starr: ''Sidewalks Talking'' 1970 (Ovation) * Realistic: ''Stereo-4 Encoded Sound Effects & Demonstration Tape'' (Realistic) *Morris Knight: ''Three Quintets for Brass; Toccata for Brass Quintet & Tape'' (New York Brass Quintet) *

David Burge David Russell Burge (March 25, 1930 – April 1, 2013) was an American pianist, conductor and composer. As a performer, he was noted for championing contemporary pieces. The ''New York Times'' called him "one of America's important pianists," and h ...

: ''Serenade for Musical Saw & Orchestra. Bill Perkins: ''Textures for Musical Saw & Percussion''. Jim Turner: ''Well Tempered Saw'' (Turner) *

Beaver & Krause Beaver & Krause were an American musical duo comprising Paul Beaver and Bernie Krause. Their 1967 album ''The Nonesuch Guide to Electronic Music'' was a pioneering work in the electronic music genre. The pair were Robert Moog's sales representati ...

: ''All Good Men'' (Warner Bros) *

: ''Gandharva'' (Warner Bros) *Hollins and Starr: ''Sidewalks Talking'' (Fallout) * Bob Crewe Generation: ''Let Me Touch You'' (Crewe) *Keith Droste: ''Big Band Moog'' (Realistic) *Bhen Lanzaroni: ''Quadraphonic'' (McConnell Records) *

Arthur Lyman Arthur Lyman (February 2, 1932 – February 24, 2002) was an Hawaiian jazz vibraphone and marimba player. His group popularized a style of faux-Polynesian music during the 1950s and 1960s which later became known as exotica. His albums became ...

: ''Puka Shells'' (GNP Cresendo) *

Mary Travers Mary Allin Travers (November 9, 1936 – September 16, 2009) was an American singer-songwriter who was known for being in the famous 1960s folk trio Peter, Paul and Mary, along with Peter Yarrow and Paul Stookey. Travers grew up amid the burg ...

: ''

Mary Mary may refer to: People * Mary (name), a feminine given name (includes a list of people with the name) Religious contexts * New Testament people named Mary, overview article linking to many of those below * Mary, mother of Jesus, also calle ...

'' (Warner Brothers) *Various Artists - Ovation Records "Introducing 4 Channel EV STEREO-4" SAMPLER 1971 album number OD/1 The

Ovation Records Ovation Records was an American independent record label based in Glenview, Illinois. The label was founded in 1969 by Dick Schory, who had been on RCA Records with his Percussion Pops Orchestra and had helped create the Dynagroove process used b ...

label initially used the EV or Stereo-4 matrix, but later changed to

. Warner Brothers later used the discrete CD-4 system - also called

Quadradisc Compatible Discrete 4, also known as Quadradisc or CD-4 (not to be confused with compact disc) was as a discrete four-channel quadraphonic system for phonograph records. The system was created by JVC and RCA in 1971 and introduced in May 1972. Hu ...

Quadraphonic Systems
/ref>

References

{{Quadraphonic sound Quadraphonic sound Surround sound