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

matrix Matrix (: matrices or matrixes) or MATRIX may refer to: Science and mathematics * Matrix (mathematics), a rectangular array of numbers, symbols or expressions * Matrix (logic), part of a formula in prenex normal form * Matrix (biology), the m ...

4-channel

quadraphonic sound Quadraphonic (or quadrophonic, also called quadrasonic or by the neologism quadio formed by analogy with "stereo"">portmanteau.html" ;"title="/nowiki>portmanteau">formed by analogy with "stereo" sound – equivalent to what is now called 4.0 s ...

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

RadioShack RadioShack (formerly written as Radio Shack) is an American electronics retailer that was established in 1921 as an amateur radio mail-order business. Its parent company was purchased by Tandy Corporation in 1962, which shifted its focus from ma ...

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.

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 incorrectly referred to as RM or Regular Matrix) was a phase amplitude Matrix decoder, matrix 4-channel quadraphonic sound system for phonograph records. The system was based ...

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 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 ...

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

Turner Turner may refer to: People and fictional characters * Turner (surname), a common surname, including a list of people and fictional characters with the name * Turner (given name), a list of people with the given name *One who uses a lathe for tur ...

) * Beaver & Krause: ''All Good Men'' (

Warner Bros Warner Bros. Entertainment Inc. (WBEI), commonly known as Warner Bros. (WB), is an American film studio, filmed entertainment studio headquartered at the Warner Bros. Studios Burbank, Warner Bros. Studios complex in Burbank, California and th ...

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

Arthur Lyman Arthur Hunt Lyman (February 2, 1932 – February 24, 2002) was a 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 ...

: ''Puka Shells'' ( GNP Crescendo) * Mary Travers: '' Mary'' (Warner Brothers) *Various Artists - ''Introducing 4 Channel EV STEREO-4'' (SAMPLER 1971 album number OD/1, Ovation Records) The Ovation Records label initially used the EV or Stereo-4 matrix, but later changed to

References

{{Quadraphonic sound Quadraphonic sound Surround sound