Pioneer QX-646

Data

General

  • Manufacturer: Pioneer
  • Model: QX-646

Type: Quadraphonic Receiver

  • Years of manufacture: 1973 - 1976
  • Made in: Japan
  • Color: silver, wooden case walnut
  • Power consumption:
  • Dimensions: 525 x 149 x 360 mm (WxHxD).
  • Weight: 12.3 kg
  • Original price approx.: 500 US-$, 2'250 DM


Connections:

  • Number of inputs:
    • Phono: 2.5 mV, 100 kOhm
    • AUX: 180 mV, 90 kOhm

Tape: 180 mV, 90 kOhm Coaxial FM antenna connection (75 Ohm)

    • AM- Antenna connection (300 Ohm)
  • Number of outputs:
    • 2 x speaker pairs: 1 x front, 1 x rear
    • 1 x headphone output: 6.3 mm jack


Technical data:

Amplifier:

  • continuous power: quadrophonic, 20-20 kHz
    • 8 Ohm: 4 x 10 Watt

4 Ohm: 4 x 11 Watt

  • music power: quadrophony, 20-20 kHz
    • 8 Ohm:
    • 4 Ohm: 4 x 20 Watt
  • Continuous power: Stereo, 20- 20 kHz
    • 8 Ohm:
    • 4 Ohm: 2 x 10 Watt
  • Continuous power: Stereo, 1 kHz
    • 8 Ohm: 26 Watt
    • 4 Ohm: 30 Watt
  • Total harmonic distortion: 0.1 % at 20- 20'000 Hz, 0.3 % at 1 Watt, 8 Ohm
  • Attenuation factor:
  • Frequency response: 10 - 100,000 Hz ± 3 dB
  • Power bandwidth: 15 - 20'000 Hz
  • Signal-to-noise ratio:
    • Phono: 70 dB

Line: 90 dB

  • Tone control: yes
    • Bass: + 13 dB, - 12.5 dB at 100 Hz
    • Treble: + 11.5 dB, - 8.5 dB at 10 kHz
  • Loudness: yes
  • High Filter: no
  • Low Filter (Subsonic): no


CD-4 demodulator part:

  • Input sensitivity: 2.5 mV
  • Input impedance: 100 kOhm
  • Distortion factor: 0,07
  • Signal-to-noise ratio: > 70 dB
  • Channel separation at 1 kHz:
    • Left to Right: 50 dB

front to rear: 30 dB

  • Frequency range: 20 - 15'000 Hz


Tuner:

  • Reception: FM, AM
  • Frequencies:
    • FM: 88 - 108 MHz
    • MW: 535 - 1600 kHz
  • Input sensitivity:
    • FM: 2.2 µV
    • MW: 15 µV
  • Frequency response: 20 - 15'000 Hz
  • Distortion factor FM: < 0,8 %
  • Signalrauschabstand:
    • UKW: 65 dB
    • AM: 50 dB
  • Stereo-Kanaltrennung: >40 dB at 1 kHz
  • Selectivity:
    • FM: 60 dB
    • MW: > 25 dB
  • Co-wave selection: 1.0 dB
  • Spurious wave selection: > 35 dB
  • Image frequency attenuation:
    • FM: > 50 dB

MW: > 45 dB IF attenuation:

    • FM: > 90 dB
    • MW: > 55 dB
  • AM suppression: 65 dB


Special Features

  • Equipped with all quadraphonic systems:
    • CD-4

SQ Decoder

    • Regular Matrix
  • Quadro level meter
  • Connection for Dolby adapter
  • FM Muting
  • Bass / Tweeter control V + H separately


Remarks



Pictures

  • Extract from brochure: Pioneer QX-646

Pioneer QX-646-Prospekt-1.jpg


  • Extract from brochure: Pioneer QX-646

Pioneer QX-646-Prospekt-11.jpg


  • Extract from brochure: Pioneer QX-646, QX-747, QX-949

Pioneer QX-626-727-929-Prospekt-2.jpg


Reports

  • Review of the Pioneer QX-747 by "Hifi Studio": [1]


  • Report at "Hifi Museum" [=quadro]


Links

  • External link Pioneer catalogue on "Hifi Archive": [2]</0,8>