Sansui QRX 9001 (1975)
A high-end quadraphonic receiver with built-in oscilloscope and proprietary matrix decoding, introduced in 1975
Overview
The Sansui QRX 9001 is a quadraphonic receiver made by Sansui, introduced in 1975 as the company's top-of-the-line model. It is known for its warm, detailed sound, robust construction, and advanced features for both stereo and 4-channel playback. Designed for serious audiophiles and quadraphonic enthusiasts, it integrates complex decoding technology and a built-in 4-channel oscilloscope for precise speaker alignment.
Specifications
| Year of Production | 1975 |
| Power Output | 125W per channel (8Ω, min. RMS, 20Hz–20kHz, ≤0.3% THD) |
| Frequency Response | 20Hz to 20kHz |
| Total Harmonic Distortion | No more than 0.3% |
| Signal-to-Noise Ratio (Phono) | 70dB |
| Signal-to-Noise Ratio (Aux) | 90dB |
| Input Sensitivity (Phono) | 2.5mV |
| Input Sensitivity (Aux) | 150mV |
| Damping Factor | 50 |
| Speaker Impedance | 4-16Ω |
| Inputs | 2 phono, 2 aux, 2 tape, tuner |
| Outputs | 2 tape, 4-channel direct out |
| Tuner Section | AM/FM |
| Dimensions (W x H x D) | 21-1/4" x 7-1/2" x 17-1/4" |
| Weight | 58 lbs |
Design
The QRX 9001 features Sansui’s proprietary QS (Quadraphonic Synthesizer) and SQ (Stereo Quadraphonic) matrix decoding, along with the Sansui Vario-Matrix circuit for 4-channel discrete quadraphonic playback.
Context
As Sansui’s top-of-the-line quadraphonic receiver, the QRX 9001 was positioned at the pinnacle of 1970s surround sound technology. It was considered one of the best quadraphonic receivers ever made, targeting audiophiles who valued both technical precision and immersive audio experiences.
Market
Common issues include failing capacitors in the power supply and decoder boards, as well as dirty controls and switches. Restoration can be expensive and time-consuming, but fully restored examples can sell for $2,000 or more, making it highly sought after by collectors and quadraphonic enthusiasts.
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Related Models
- Sansui 2000A (1968-1970)
- Sansui 3000A (1968-1970)
- Sansui 5000X (1969-1971)
- Sansui 551 (1973-1975)
- Sansui 6060 (1975-1977)
- Quad 44/405-COMBINATION (1976)
- Braun AUDIO-1 (1965)
- Braun AUDIO-250 (1965)
- Braun AUDIO-310 (1965)
- Magnavox Component Systems (1972)