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
  • 38x4 into 8 ohms and 50x4 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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2 thoughts on “Pioneer QX-9900

  1. Have had the pleasure of owning a few of these. If in good condition, cleaned properly and tuned up, it is a VERY beautiful looking and sounding machine. Incredible sound, very nicely organized controls and good looking face panel. Lots of power, little distortion but…very, very heavy. Over 50 lbs, so not very compatible with flimsy furniture.
    But, drives ANY speaker you connect and you can connect a ton of them. If you can get one in good shape, clean it right and treat it well, you will not be disappointed in it.

  2. I have one in perfect condition I am looking to sell if anyone is interested. It was my dad’s and he has passed away and I need to declutter. 785-383-4017

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