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Pioneer QA-800

Solid State Four Channel Amplifier (1971-72)

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Pioneer QA-800


This radically new Pioneer pre/main amplifier is your passport to the stunning adventure of four channel stereo.

A total capability unit that provides up to 204 watts of musical power at 4 ohms, the QA-800 permits the creation of a brilliant concert hall acoustical field in your own listening room without the additional cost of multiple stereo accessories.

It's total of four amplifiers, and ingenious quadralizer circuitry, means that you may create four-channel sound from any existing two-channel stereo source which you now possess: pre-recorded tapes, your own stereo discs, or FM broadcast.

The QA-800 offers a choice of two Quadralizing Effect Systems for home music reproduction:

(1) the Matrix operation, which creates a room-enveloping sound field without specifying instrument locations

(2) the Phase Shift operation, which produces normal, transparent two-channel stereo sound from the front speakers, but adds a phase-shifted concert hall effect with a slight echo effect from two rear speakers.

Either of these quadraphonic effects are possible simply by pushing a switch that is conveniently located on the front instrument panel.

The rich sound of quadraphonic stereo is here and Pioneer's QA-800 gets you into this total sound picture better than any other unit of its kind or price.


Power output: 27W/ch into 8Ω (stereo), 20W/ch into 8Ω (quadraphonic)

Frequency response: 20Hz to 40kHz

Total harmonic distortion: 0.5%

Damping factor: 40

Input sensitivity: 2.5mV (MM), 200mV (line)

Signal to noise ratio: 80dB (MM), 90dB (line)

Channel separation: 40dB (MM), 50dB (line)

Output: 200mV (line), 0.5V (Pre out)

Speaker load impedance: 4Ω to 16Ω

Semiconductors: 51 x transistors, 9 x diodes

Dimensions: 430 x 145 x 337mm

Weight: 10.9kg

Year: 1971


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Reviewed Feb 23rd, 2019 by

Quad amps are kind of a thing with me. I like to Bi-amp with different sets of speakers. I have two of these with a set of 10 inch CV speakers on one, and a set of 12 inch Sansui speakers on the other. Adjustability is almost infinite. Sound is classic Pioneer.



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