Sansui QRX-5500


Sansui QRX-5500


This Sansui QRX-550 is one of Sansui’s Quadrophonic offerings. It puts out 30 per channel to four channels into 8ohms.  It is part of the early beginnings of surround sound. I believe Sansui had six QRX quad offerings and the QRX-5500 was the middle of the spectrum receiver. It was produced in the early 70’s. There was also a QRX-5500A version that reflected a change in the syntax of the decoding from QS to QA and SQ. It has that classic early Sansui styling that was also found on the 9090DB.


Sansui QRX-5500


The QRX-5500 had a number of decoding options such as:

– QS Synthesizer

Surround +  Hall

– QS Regular Matrix

Surround +  Hall

– Phase Matrix

– Discrete

– 2-Channel



Sansui QRX-5500 Inside


The Sansui quad receivers are all fairly popular.  They are difficult to find in full working condition but, when they are, they sell for reasonable prices. While the top of the line QRX-9001 sells for over $500.00 the middle of the road QRX-5500 sell for under $200.00.

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Pioneer QX-9900


Pioneer QX-9900 Faceplate


This is one of Pioneer’s four channel offerings – the Pioneer QX-9900. The QX-9900 was manufactured in the mid 70’s and featured both Matrix and SQ decoding. It’s rated at 38 watts per channel into 8 ohms and 50 watts at 4 ohms in to four channels. This unit has the distinctive holes in the top of the case.


Pioneer QX-9900 Back Panel


It also featured:

  • AM/FM stereo
  • 38×4 into 8 ohms and 50×4 into 4 ohms
  • Two tape in/outs front and rear
  • Two aux inputs front and rear
  • Two phono inputs
  • Loudness on/off front and rear selectors
  • Filters high and low on/off
  • Muting -20db on/off
  • Speakers front + Rear A & B on/off
  • MPX noise filter on/off
  • Headphone outputs front and rear
  • FM muting on/off
  • Modes – 2ch stereo, matrix regular, SQ, discrete
  • Selectors – AM, FM mono, FM auto, phono one + two, aux one + two
  • Meter levels -10db on/off -20db on/off
  • Balance front right/left, rear right/left and front to rear
  • Reverberation – time/min/max and modes for front – rear – mode off – mic
  • Left + right mic inputs
  • Left + right mic mixing control knobs
  • Separate treble and bass controls front/rear
  • Tuning and signal meters
  • 4 power meters for each channel


Pioneer QX-9900 Inside


While the Pioneer QX-9900 is fairly rare it’s not a hotly desired receiver. Still, in very good working condition they can sell for up to $400.

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