Sansui QRX 9001 receiver

Description

Key Features and Characteristics:

• 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   
• 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.