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SOLD - BEST OFFER FOR: Sansui QSD-1 Quad decoder and synthesizer - very rare

Item #649308319
Info: Sansui QSD-1 Quad decoder and synthesizer - very rare

Asking Price:
CAD $900.00
Payment method: Cash, Paypal, Cheque
Shipping weight: 9.07 (kg) Calculate Shipping
Shipping Dimension: 60.96cm x 40.64cm x 30.48cm
Condition: 8 - Very good (?)
Date Posted: Oct 26, 16 10:53am (PST)
Edited: Feb 22, 17 8:24am
About Seller: BC, Canada
Product Brand: Sansui
Product Model: QSD-1
External Feedback: hticheno (786)
Days in System:157

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There were several Sansui quad models in the 1970s and early '80s. The QSD-1 is the best for QS playback and QS Synthesizing, as it was built for professional studios. It is considered superior to the consumer models: QS-D1000, the QRX-9001, QS-1 and the QSD-2 Synthesizer/Decoder.

In addition to correct decoding the QSD-1 is designed to synthesize quad from standard two channel stereo recording.

This is considered to be "the Holy Grail" for quad enthusiasts.

Description from Sansui sales brochure

“Sansui’s new QSD-1 is not just for any 4-channel fan. This extraordinary advanced QS 4-channel decoder/synthesizer was created specifically for professional and semi-professional applications only. And like any fine audio instrument it deserves to be incorporated within a total system of the highest quality – from source components and preamplifiers right on through to power amplifiers and speaker systems.

The QSD-1 is the culmination of Sansui’s original QS 4-channel technology for the discriminating audiophile. Thanks to its three separate QS vario-matrix decoders, each constructed of four custom-designed ICs and each responsible for a particular frequency band, it delivers unparalleled QS 4-channel decoding performance, plus the proven ability to produce musically accurate 4-channel sound signals from ordinary 2-channel sources.

It is the most technically advanced 4-channel matrix decoder and 4-channel synthesizer available to the consumer today.”


Frequency response: 20 to 30,000Hz

Distortion: less than 0.1%

Channels separation: 20dB (adjacent channels), 30dB (diagonal channels)

Input sensitivity: 100mV (2 channel), 140mV (4 channel)

Output level: 300mV

Semiconductors: 35 x transistors, 16 x diodes, 1 x zener diode, 12 x IC, 1 x LED

The QSD-1 is ready for rack mounting: the front-panel is 480mm wide.

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