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, introduced in 1975 as the top of the Sansui line. It is known for a warm, detailed sound, heavy construction, and a long list of features for both stereo and 4-channel playback. It was built for serious audiophiles and quadraphonic enthusiasts. It packs in complex decoding circuitry and a built-in 4-channel oscilloscope for lining up the speakers.
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 has Sansui's own QS (Quadraphonic Synthesizer) and SQ (Stereo Quadraphonic) matrix decoding. It also has the Sansui Vario-Matrix circuit for 4-channel discrete quadraphonic playback.
Context
The QRX 9001 was Sansui's top quadraphonic receiver, and it sat at the top of 1970s surround sound technology. It was considered one of the best quadraphonic receivers ever made. It was aimed at audiophiles who wanted technical precision and immersive audio.
Market
Common problems are failing capacitors in the power supply and decoder boards, plus dirty controls and switches. Restoration can be expensive and slow. Fully restored examples can sell for $2,000 or more, and collectors and quadraphonic enthusiasts go after them.
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Related Models
- Sansui 2000A (1968-1970)
- Sansui 5000X (1969-1971)
- Sansui 6060 (1975-1977)
- Sansui 7000X
- Sansui 881 (1974-1976)
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- Magnavox Component Systems (1972)
- Acoustic Research AR (1967-1976)
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