Product Name | Manufacturer | Type | What it is |
---|---|---|---|

2-4 Enhance | Sony/Columbia | Derived | Deriver |

2+2 | Koss | All | 4-channel headphone |

2+2 | Fisher | Matrix | RM matrix decoder |

Audio Pulse Enhancer | Audio Pulse | Derived | Enhanced stereo |

AutoVary | UniQuad | Matrix | Separation enhancement |

BMX | Denon | Matrix | Basic version of UMX (BBC Matrix F) |

CD-4 | JVC / RCA | Discrete | Discrete carrier phonograph record |

Circlesurround | SRS | Matrix | Cinema matrix |

Composer | Lafayette | Matrix | RM matrix decoder |

CSG Process | Haeco | Compatible Stereo | Compatible stereo generator |

Decoder-4 | Sanyo | Matrix | Adjustable matrix decoder |

Dolby Stereo | Dolby Labs | Encoder | Film matrix encoder |

Dolby Surround | Dolby Labs | Matrix | Matrix decoder |

DQ | Dynaco | Matrix / Derived | Abbreviation for Dynaquad |

Dual Triphonic | Denon | Matrix | Matrix decoder |

Dynaquad | Dynaco | Matrix / Derived | Matrix / derived decoder |

EV | Electro-Voice | Matrix | Old Electro Voice EVX-4 matrix |

Fosgate MP | Fosgate | Matrix | Separation enhanced Dolby Surround |

Ghent | Columbia | Encoder | SQ Matrix encoder |

Haeco CSG | Haeco | Compatible Stereo | Compatible stereo generator |

Hexaphonic Tridee | Dolby? | 3D Matrix | 3D Dolby Stereo |

Matrix E | BBC | Matrix | BBC Matrix E - Equal Separation Matrix |

Matrix G | BBC | Matrix | BBC Matrix G - Modification of Matrix F (BMX) |

Matrix H | BBC | Matrix | BBC Matrix H - Modification of Matrix G |

Phase Matrix | EIAJ | Matrix | EIAJ definition of SQ (PM) |

Phase-4 | London Records | Record Label | A trademark † |

Phase Matrix | Sansui | Matrix | SQ matrix decoder |

Phase Q4 | Sylvania | Matrix / Derived | Matrix / derived decoder |

Phase Shift Network | Harmon Kardon | Derived | Deriver |

Phlazex | UniQuad | Encoder | Wide stereo / RM encoder |

PM | EIAJ | Matrix | EIAJ definition of SQ (Phase Matrix) |

Pro-Logic | Dolby Labs | Matrix | Separation enhancement |

Product Name | Manufacturer | Type | What it is |

Qaudio | Toyo | All | 4-channel equipment line, decoder |

QM | EIAJ | Matrix | EIAJ definition of front-oriented matrix |

QM | Pilot | Matrix | Regular matrix decoder |

QM Acoustic Effect Simulator | Toshiba | Derived | Deriver |

QMX | Denon | Matrix | Discrete version of UMX matrix |

QS | Sansui | Matrix / Derived | QS matrix decoder (BBC Matrix A) |

QUAD | QUAD IAG Ltd. | Trademark acronym | A trademark "Quality Unit Amplifier Domestic" † |

Quadaptor | Dynaco | Matrix / Derived | Dynaquad matrix / derived decoder |

Quadradial | Marantz | Matrix / Derived | Matrix / derived decoder |

Quadralizer | Pioneer | Matrix | Matrix decoder |

Quadrant | H H Scott | Matrix / Derived | Matrix / derived decoder |

Quadraplex | Magnavox | Matrix | RM matrix decoder |

Quadrasizer | SSI | Matrix / Derived | Matrix / derived decoder |

Quadrasonic | Panasonic | Discrete | Tape machines |

QuadraSync | Akai | Discrete | Tape overdub sync device |

Quadrix | Kenwood | Matrix / Derived | Matrix / derived decoder |

Quadruplex | Panasonic | Matrix Decoder | RM matrix decoder |

QuasiQuad | BSR | Derived | Deriver |

Quatrasonic | Eico | Matrix / Derived | Matrix / derived decoder |

Quatravox | Realistic | Matrix / Derived | Matrix / derived decoder |

Quintaphonic | The Who / Sansui | Matrix | 3-track film, QS, discrete center front |

QX | Denon | Matrix | EV-type matrix record |

Product Name | Manufacturer | Type | What it is |

Regular Matrix | EIAJ | Matrix | EIAJ definition of QS (RM) |

RM | EIAJ | Matrix | EIAJ definition of QS (Regular Matrix) |

Sel-Sync | Ampex | Discrete | Tape overdub sync device |

Simul-Sync | TEAC | Discrete | Tape overdub sync device |

Spheround | UniQuad | Matrix | 3-D surround-field matrix |

SQ | Columbia | Matrix | SQ Matrix (BBC Matrix B) |

SRS | SRS Labs | Derived | Enhanced stereo |

Stereo-4 | Electro-Voice | Matrix | EV matrix decoder |

Stereo-44 | Electro-Voice | Matrix | EV Universal matrix decoder |

Stereo-180 | Audionics | Encoder | Matrix encoder mic layout |

StereoQuad | Columbia | Matrix | Matrix (meaning of SQ) |

Studio-4 | Utah | Derived | Deriver |

Surrfield | UniQuad | Matrix | Surround field matrix |

Tate SQ | Fosgate | Matrix | Separation enhanced SQ decoder |

Tetraphonic 3D | (unknown) | 3D Matrix | Tetrahedral speaker decode for Hexaphonic Tridee |

Tetrix | BBC | Matrix | BBC Matrix E - Equal Separation Matrix |

UD-4 | Denon | Matrix | Discrete / Matrix QMX phonograph record |

UM | EIAJ | Matrix | EIAJ standard for UMX matrix |

UMX | Denon | Matrix | Discrete / Matrix systems BMX and QMX |

Universal | Electro-Voice | Matrix | EV Universal matrix decoder |

Universal | Metrotec | Matrix / Derived | SQ, EV, derived decoder |

Variblend | Columbia | Matrix | SQ Separation enhancement (BBC Matrix D) |

Vari-Matrix | Marantz | Matrix | Adjustable RM decoder |

Vario-Matrix | Sansui | Matrix | QS Separation enhancement (BBC Matrix C) |

XM | Denon | Matrix | Denon Triphonic and Dual Triphonic QM systems |

( • ) | SRS Labs | Derived | SRS stereo enhancer |

( • ) | SRS Labs | Encoder | SRS enhanced stereo recording |

† NOT quadraphonic or surround

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