Quadraphonic and Stereo Capabilities: The QRX-9001 is designed for both 4-channel quadraphonic sound and traditional 2-channel stereo. It can decode various quadraphonic formats like QS, SQ, and CD-4, allowing playback of dedicated quad recordings. It can also synthesize 4-channel sound from conventional 2-channel stereo sources.
High Power Output: In stereo mode, it typically delivers a substantial 120 watts per channel into 8 ohms. In quadraphonic mode, it outputs 60 watts per channel into 8 ohms . This power allows it to drive demanding loudspeakers with authority.
Multiple Inputs and Outputs: It features a comprehensive set of inputs, including multiple phono inputs (often with adjustable impedance for MM cartridges), auxiliary inputs, tape monitor loops, and FM/AM tuner sections. It also offers multiple speaker outputs for both stereo and quadraphonic configurations, as well as preamp outputs and main amp inputs, sometimes with a pre-out/main-in modification done by enthusiasts for greater flexibility.
Built-in Dolby Noise Reduction: The receiver incorporates Dolby noise reduction circuitry, enhancing the fidelity of compatible recordings.
Direct-Reading Power Meters: It features prominent and accurate power meters on the front panel, providing a visual indication of the amplifier's output.
Tone Controls and Filters: The QRX-9001 typically includes bass and treble controls, as well as high and low filters to shape the sound and reduce unwanted noise.
Versatile Switching and Controls: The front panel is packed with numerous switches and knobs for selecting listening modes (2-channel, Quad), decoder modes (QS, SQ, CD-4), input sources, tape monitoring, and more.
Robust Build Quality: Sansui receivers from this era are known for their solid construction, using high-quality components and often featuring a substantial wood cabinet and a classic silver faceplate.
Potential Specifications:
Tuning Range: FM, MW
Power Output:
120 W/ch (stereo, 8Ω)
60 W/ch (quadraphonic, 8Ω)
Frequency Response: 20 Hz to 30 kHz
Total Harmonic Distortion: 0.3%
Damping Factor: 30
Input Sensitivity:
2.5 mV (MM Phono)
100 mV (DIN)
100 mV (Line)
Signal to Noise Ratio:
70 dB (MM Phono)
80 dB (DIN)
80 dB (Line)
Channel Separation:
45 dB (MM Phono)
45 dB (Line)
Output: 100 mV (Line), 30 mV (DIN)
Speaker Load Impedance: 4Ω to 8Ω
Dimensions (W x H x D): 600 x 174 x 415 mm
Weight: 23 kg
Meta Description:
The Sansui QRX-9001 is a legendary quadraphonic/stereo receiver from the 1970s, delivering high power, versatile features including Dolby noise reduction and multi-format decoding, and robust build quality.
