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Up for sale is a legendary piece of audio history – the Sansui QS-1 Quadraphonic 4-Channel Synthesizer Decoder. Released in the early 1970s, this ingenious instrument uses Sansui's patented QS Regular Matrix system to magically transform standard 2-channel stereo signals into a rich, immersive 4-channel quadraphonic soundstage.It is the perfect addition for vintage audio enthusiasts, collectors, or anyone looking to expand their classic hi-fi setup into the world of quadraphonic sound.Technical Condition:Overall status: Fully operational Testing: All channels, knobs, and switches work smoothly without any scratchy noise.VU Meters: Backlights and meters are fully functional and responsive.Voltage: 100V Visual Condition:Front Panel: Clean brushed aluminum faceplate with original knobs in great condition. Brand new sticker left on front panelCabinet: Excellent wooden case with nosigns of wear Overall: Well-preserved vintage piece that looks stunning on any audio rack.Key Specifications:Type: 4-channel quadraphonic synthesizer/decoder.Decoding System: Patented Sansui QS Matrix.Functions: Converts any stereo source (vinyl, tape, CD) into a 4-channel matrix output.Controls: Level balance, functions switch, and beautiful analog VU meters.Era: Early 1970s (Made in Japan).Shipping & Packaging:Will be securely packed with double boxing and plenty of bubble wrap to ensure safe transit.Shipping within Europe with a tracking number..Feel free to message me if you have any questions or need more photos!
Sansui’s 1970s gear has a solid reputation for warm, muscular presentation and the kind of build quality that still draws collectors, so this is the sort of listing that can be worth chasing. At US$732, it lands just under the US$741 median and a touch below the US$784 75th percentile, so this reads as a fair-to-good asking price rather than a bargain, but not overpriced.
That makes it appealing if the unit is clean, original, and recently serviced, because well-kept Sansui pieces tend to reward careful ownership and hold interest with both listeners and collectors. The main thing to verify is function and service history: age-related wear, tired switches, and undocumented repairs can matter more than a small difference in asking price, so a confirmed healthy unit with no missing parts would make this a sensible buy.
Independent perspective — not a price guarantee. Always verify condition, accessories and provenance before purchase.
Sansui, a pioneering Japanese audio brand, traces its origins to 1947 when it was founded in Tokyo by brothers Sakurai and Shunichi Yamamoto. Emerging from post-war Japan, the company quickly established itself as an innovator in consumer electronics, leveraging precision engineering to craft components that rivaled Western counterparts. Its heritage is rooted in the golden era of hi-fi, where Sansui's commitment to sonic purity helped define Japan's rise as a global audio powerhouse.
The brand excelled in a broad spectrum of hi-fi categories, with particular renown for its integrated amplifiers, receivers, and tuners that delivered warm, dynamic sound. Sansui also produced acclaimed speakers, turntables, cassette decks, and later digital converters, emphasizing robust build quality and innovative features like direct-coupled circuitry for low distortion. These products catered to audiophiles seeking balanced performance across analog and early digital domains.
Today, Sansui holds a cherished position in the vintage collector market, revered for its mid-to-high-end gear from the 1970s and 1980s—icons like the AU-series amps remain sought after for their musicality and reliability. While no longer a frontline manufacturer, its legacy endures among discerning buyers restoring classics or hunting timeless performers, blending nostalgia with enduring value.
See all Sansui listings on RADAR.
