Sansui - QR-6500 Solid state multi-channel amplifier

Well-functioning Sansui QR-6500 Quadraphonic Receiver — A musical legend from the 1970s

This beautiful Sansui QR-6500 is an iconic 4-channel quadraphonic receiver — a highlight from Sansui’s golden era of high-fidelity audio. Built in Japan in the early 1970s, this receiver combines a powerful quad amplifier, a super-sensitive AM/FM tuner, and an advanced four-channel synthesizer/decoder. All of this is housed in a robust metal front panel with elegant wood veneer casing, making it not only a technical masterpiece but also a stunning statement piece in your listening room.

Whether you want to experience classic quadraphonic albums, stereo recordings, or modern tracks, the QR-6500 offers a warm, dynamic, and multidimensional sound reproduction that brings the stage and ambiance of live performances to life.

Main features
• Quadraphonic Sound – Pioneering four-channel sound image for depth, ambiance, and spatiality.
Synthesizer decoder – integrates four-channel decoding with conventional stereo sources (quadraphonic synthesis).
• AM/FM tuner – Super-sensitive tuner for clear, noise-free radio sound.
Robust construction – Solid metal front plate with a classic wood veneer housing.
Collector’s piece – Very popular among vintage audio enthusiasts and collectors.

Technical Specifications

General
• Type: 4-channel quadraphonic receiver
• Production period: ±1971–1973
Made in: Japan
• Dimensions: 538 × 197 × 362 mm (W × H × D)
Weight: ±22 kg
• Color: Aluminium front with wood veneer housing.

Power
• Output power: 37 W per channel @ 8 Ω (quadraphonic)
At 4 Ω: ±50 W/channel (estimated, depending on source)

Frequency & Sound
Frequency range: 20 Hz – 30 kHz
• Total harmonic distortion: 0.5%
• Signal-to-noise ratio: 60 dB (MM), 70 dB (line)
Channel separation: ~55 dB (line)
Damping factor: 30

Inputs & Outputs
• Phono, Aux, Tape inputs (including 2- and 4-channel)
• Line outputs, DIN output, and headphone options.
Speaker impedance: 4–16 Ω

Tuner
FM & MW reception with an analog illuminated tuner meter.

Why the Sansui QR-6500 is So Valued

The QR-6500 is known as one of the most important receivers in Sansui’s history — a model of 1970s audio engineering that combines performance, design, and multi-channel innovation. Thanks to its unique decoder and quadraphonic capabilities, it was one of the top choices for listeners seeking a more spacious and richer sound image than traditional stereo receivers could offer. Its substantial build and classic aesthetics make it a sought-after collector’s item today and an iconic part of any vintage audio setup.