Quadraphonic is a forgotten Surround Sound system from the early 1970s.
This system used four channels with speakers positioned at the four corners of the listening room. It was never a huge success because of the expensive equipment, conflicting formats and available albums. True, four separate channels, were used in the UD-4, CD-4, Quad-08 and Q4 systems. A different approach was the encoded system where the four channels were converted (encoded) in two channels (usually a vinyl LP) These records were decoded with a decoder in four channels. Some of the formats were the Matrix H, EV-4, and the completely different SQ and QS.
Here are some examples of quadraphonic amplifiers and decoders made in the early 1970s.
AKAI AS-980 quadro receiver (SQ, RM, CD-4)
AKAI GX-280D SS 4-channel tape deck (1973)
BLAUPUNKT Delta 6011 V quadro receiver (SQ-decoder) (1974)
Victor (JVC) Ssystem 105 - stereo / quadro components
JVC 4VR-5456X quadro receiver (1977)
JVC MCA-V9 quadro amplifier
Victor (JVC) MCA-V9 quadro amplifier
JVC 4VR-5426X quadro reeceiver (CD-4) (1977)
JVC 4VN-990 quadro amplifier (SQ Matrix) (1977)
JVC JA-X9 quadro amplifier (CD-4, Matrix) (1977)
LOEWE QR 320 quadro receiver (1975)
LOEWE QV 300, QV 310 quadro amplifier
marantz Model 4400 quadro receiver (1973)
marantz Model 4060 quadro aplifier, Model 4415 quadro receiver
PIONEER QC-80 QM-80 and QA-80 quadro amplifiers (1971)
PIONEER quadro system
PIONEER QX-8000, QL-600, QT-6600, QC-800A, QM-800A,
QA-800A, QL-800A, QD-240 quadro components
PIONEER QL-60 quadro amplifier
PIONEER QX-80 quadro receiver
Sansui QRX-3000, QRX-3500 quadro receivers (SQ Matrix) (1973)
Sansui QS-1, QS-100 quadro amplifiers
SONY SQD-2020 quadro decoder (SQ Matrix)
SONY SQR-6650 quadro receiver
SONY SQA-200 quadro decoder (SQ Matrix)
SONY SQD-2020 quadro decoder (SQ Matrix) (1973)
SABA HiFi-Studio 8200 quadro receiver (1974)
SABA HiFi-Studio 8280 quadro receiver (1975)
TELEFUNKEN TRX 2000 hifi qudro receiver (1978)
KENWOOD KR-8340 quadro receiver (1973)
NORDMENDE Quadronado QXL-160 quadro receiver (SQ, CD-4) (1974)
YAMAHA quadro system
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