Sansui QRX-5500A:

A Classic in Quadraphonic Sound

Looking for a powerful quadraphonic amplifier that delivers rich, immersive sound? The Sansui QRX-5500 is a 220-watt, 4-channel amplifier with a sensitive FM/AM stereo tuner, designed for the ultimate 4-channel audio experience. Its standout feature is the advanced 4-channel Synthesizer and Decoder section, which allows you to fine-tune the reproduction modes to perfectly suit your space.

Condition and Restoration

This unit is in excellent fully functional condition, with only minor cosmetic imperfections, including a few scratches on the cabinet from a previous owner, see photos. It has undergone a full service check, including cleaning of controls, switches, and the chassis, ensuring peak performance.

• Production Years: 1973–74
• Condition: 8/10
• Original MSRP: $599.95

Factory Specifications

• Type: Solid-state AM/FM stereo tuner
• Tuning Range: AM/FM
• Power Output: 22W/ch into 8Ω (quadraphonic)
• Frequency Response: 30Hz to 30kHz
• Total Harmonic Distortion: 0.3%
• Damping Factor: 40
• Input Sensitivity: 2.5mV (mic, MM), 100mV (DIN, line)
• Signal-to-Noise Ratio: 70dB (MM), 80dB (line)
• Output: 100mV (line), 30mV (DIN)
• Speaker Load Impedance: 4Ω to 16Ω
• Semiconductors: 136 transistors, 5 FETs, 80 diodes, 6 zener diodes, 3 ICs

Dimensions and Weight

• Dimensions: 23.5"W x 8"H x 14.75"D
• Weight: 48 lbs.

About Sansui

Founded in Tokyo, Japan, in 1947, Sansui started as a transformer manufacturer before becoming one of the most respected names in audio. Known for its innovative designs and groundbreaking audio technology, Sansui reached its peak during the late 1970s and mid-1980s. The name “Sansui,” meaning “Mountain and Water,” reflects its blend of technical precision and natural inspiration.

Liner Notes

Sansui revolutionized 4-channel audio with the QS regular matrix system, QS vario-matrix, and the QS Synthesizer. The QRX-5500 combines these advancements in one robust unit, delivering realistic quadraphonic reproduction for any stereo or 4-channel source.

Discover the legacy of Sansui and experience the golden age of quadraphonic sound with this iconic amplifier.