What is stereo?

There are now two system of high fidelity, monophonic (monaural) and stereophonic. Monophonic is a system that starts from one microphone and is fed through a single high fidelity set. Stereophonic is a double system. Two separate microphones are placed at different sides of the orchestra and two different systems are used to keep the two signals or channels separated. Two separate speakers are used, placed on different sides of you room. Stereo is much like 3-D photography, two slightly different sound reach your ears giving you a new dimension in sound.

H.H. Scott '59

Pioneer QC-800 (1972)

A single unit, four-channel preamplifier with unique Quadralizer for the creation of a living presence sound field in the home.

Quadraphonic stereo is the ultimate in sound realism, and with Pioneer's Model QC-800,a quadraphonic power amp (or two stereo amplifiers) and four speakers you can enjoy this sound brilliance today in your own home. This well-made, highly-advanced unit is unusually versatile. It provides a choice from any existing two-channel stereo source (tape,disc of FM), as well as discrete four-channel stereo, the most genuine and thrilling four-channel sound. And it can also be used as a conventional two-channel stereo pre-amplifier if you intend to wait until adding another pair of speakers to your existing stereo set. The QC-800 is a perfect match to Pioneer's Quadraphonic Power Amplifier (Model QM-800). And it's your most versatile introduction to the grandeur of four-channel stereo, a solid investment it the sound of the future that Pioneer has perfected today.

Your Own Acoustical Field

The exclusive Pioneer Quadralizer contained within the QC-800 creates an all-encompassing four-channel sound field in your home, giving you the same, full, life-like sansation of being in an acoustically perfect concert hall.

Choose Your Four-Channel System

The Quadralizer creates four-channel sound from any existing two-channel stereo source - either tape, disc or FM. And the QC-800 gives you a choice of three totally different four-channel effects.

Discrete Four-Channel Stereo

This is both the most authentic in terms of sound quality, and the most expensive since it requires a four-channel tape deck and special four-channel tapes. The sound is reproduced at a very high degree of fidelity, since the tape deck reproduces sound recorded on each of four separate tracks.

Matrix-Type Four-Channel Stereo

The "matrix" system of four-channel sound is one of the quadralizing effect systems in the QC-800. This systems creates a room-enveloping sound field, when signals from a two-channel program source are fed through a unique matrix circuitry contained within the preamplifier. These signals are analyzed and divided into four different signals which are then fed to four loudspeakers systems for sound reproduction. the matrix system is highly suitable for the reproduction of popular music or small combo group performances.

Phase Shift Four-Channel Stereo

The "phase shift" system of four-channel sound is another of the quadralizing effect systems in the QC-800. With this system, the conventional left and right stereophonic channels are reproduced from the two loudspeakers systems situated in front of the listener. But added to this sound is a phase-shifted 'wall of soud", or concert hall effect which emanates from the pair of loudspeakers placed behind the listener. The result is the rich depth of a live performance a slight enveloping echo effect through the two rear speakers, a thrilling musical experience. The Pioneer phase shift system is especially effective in the reproduction of classical or operatic music.

High Stability Head Amplifier

The head amplifier section of the QC-800 incorporates a 3-stage direct-coupling negative feedback circuitutilizing low-noise silicon transistors and emitter-to-emitter feedback. These features result in accurate equalizing characteristics with a wide dynamic range and stable performance.

Switch-Type Tone Controls

The tone control amplifier is a directly coupled three-stage design with a low-noise FET in its first stage. Its high, stable input impedance assures precise tone control at any setting without affecting the head amplifier. The tone controls are true switch types which regulate negative feedback. Each switching step has an effect of +/- 3 dB. Additionally, separate controls are provided for front and rear channels, permitting total control over the total tonal quality.

Versatile Inputs And Auxiliary Controls

Inputs of the QC-800 accept two turntables, two tape decks, a tuner and a choice of two other sound sources. There are separate headphone jacks for monitoring both front and rear channels. Controls include an output on/off switch, a -20 dB muting switch, high and low filters and a tape monitor switch. Versatility of the unit is practically unlimited.

Channel Level Controls

Each of the four channels is equipped with a level control, which permits total control over the sound field intensity even when different speaker types are used for front and rear listening.

Tape-To-Tape Duplicating

Because the QC-800 has a pair of tape deck inputs, tape-to-tape duplicating may be accomplished with ease. Normal two-channel tape-to-tape duplicating is also possible as if four-channel tape-to-tape duplicating.


Pre-amplifiers Section

Output Voltage/Impedance: Output 1,2; 4V/less than 5 Ω (2 ch)

Harmonic Distortion: less than 0,05% (2V output)

Frequency Response: 10 to 70,000 Hz ±1 dB

Input Sensitivity/Impedance:

Phono 1, 2: 4 mV/50 kΩ (2 ch)

Tuner: 250 mV/180 kΩ (4 ch)

Aux 1,2: 250 mV/180 kΩ (4 ch)

Tape Monitor 1, 2: 250 mV/200 kΩ 94 ch)

Recording Output: Tape Rec 1, 2 (pin jack); 250mV (4 ch)

Bass Control: -9 dB, +12 dB at 100 Hz (3 dB step)

Treble Control: -12 dB, +9 dB at 10 kHz (3 dB step)

Low Filter: -8 dB/50 Hz

High Filter: -8 dB/10 kHz

Equalization Curve: Phono RIAA STD

Muting: -20 dB

Hum amd Noise (IHF):

Phono : More than 89 dB

Tuner, Aux : More than 100 dB

Channel Separation (1 kHz):

Phono : More than 50 dB

Tuner, Aux : More than 50 dB

Phones: For (ch 1, ch 3) and (ch 2, ch 4)


Transistors : 32

FET (s) : 4

Diodes : 3


Power Requirements: 110, 120, 130, 220, 240 V (switchable) 50/60 Hz

Power Consumption: 5 watts (max.)

Dimensions (W x H x D): 430 x 145 x 337 mm (16-15/16 x 5-11/16 x 13-1/4 inches)

Weight: 7,6 kg (16 lb 12 oz)

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