To compose an ideal 4-channel stereo system, the QX-8000A, a solid state AM/FM stereo receiver, can be combined with four speaker systems, tape decks, turntables, etc. With a 4-channel stereo tape deck or cartridge tape player installed, the QX-8000A can provide a discrete 4-channel playback of programs recorded on tape.
4-Channel Reproduction from Matrix 4-Channel Source
The self-contained matrix circuit permits 4-channel reproduction from matrix 4-channel records or FM stereo broadcasts. The mode switch has positions for regular matrix and SQ matrix reproduction, allowing reproduction to take either of these forms.
Matrix Reproduction from 2-Channel Source
A 2-channel signal from a record of FM broadcast can be reproduced in 4-channel form via the regular or SQ matrix circuit. In this case, the result is an improvement over ordinary 2-channel stereo reproduction.
2-Channel Stereo Performance
Conventional 2-channel stereo performance can be provided through an arrangement or two speaker systems in the front; Ieft-side speaker system and right-side speaker system. A 2-way multi-amplifier system can be set up by installing an electronic crossover network.
Features
Acoustical field reproduction from 4-channel stereo
The amplifier section consists of four separate channels having excellent frequency response and very low distortion, providing for 4-channel discrete reproduction of a 4- channel source (recorded tape).
Choice of matrix decoder
The OX-8000A offers a choice of two decoders; the regular matrix and the SO matrix. The source may be a matrix recording or FM broadcast of a matrix recording. The result is realistic 4-channel reproduction.
Matrix circuit for ordinary 2-channel stereo
Use of the internal matrix circuit enhances the effect of ordinary 2-channel stereo source material, over and above that normally obtainable.
Also works as standard 2-channel stereo receiver
lf you only have one pair of speakers now, you can use the OX-8000A as a regular 2-channel stereo receiver and add the other two speakers at a later date.
Permits 4-Channel or 2-Channel tape recording
lf you already own a 2-channel stereo tape deck, you can go on using it for recording and playback as before. However, if you plan to buy a 4-channel tape recorder, you can use fully the discrete 4-channel capabilities, playing back 4-channel pre-recorded tapes with true 4-channel sound.
Fully equipped with 4-channel Auxiliary controls and inputs
There are three balance controls: front left-right balance, rear left-right balance, and front-rear balance. These give you complete control over the 4-channel sound field. Also, separate stereo headphones for the front and rear channels are provided important when monitoring 4- channel tape recordings. Other features include "speakers in operation" indicator lamps, program indicator lamps, loudness switch, high and low filter switches, FM muting switch, 300Q and 75O (coaxial) FM antenna terminals, and a 4-position channel mode selector.
Versatile tape-to-tape duplicating facilities
Normal 2-channel tape-to-tape dubbing is possible too, as well as 4-channel tape-to-tape duplicating.
FET-equipped FM tuner
The FM tuner is equipped with an FET in its front end to improve selectivity and sensitivity. Also, the lF stage employs one hybrid and one monolithic lC, replacing numerous transistors, ceramic filters, etc., and raising the tuner's sensitivity and selectivity. The FM MPX decoder works according to the time switching system and boasts excellent channel separation. Tuning is made easy by the linear FM dial and the double (signal strength and center zero tuning meters.
Built-in AM ferrite Bar antenna
Sensitive and highly directional. An outdoor AM antenna is not required in most cases.
Low-distortion High-Power Audio amplifier
Both tone controls and equalization amplifier operate with a generous amount of negative feedback for improved frequency response accuracy and flatness. The power amplifier is a quasi-complementary design, a tried-and-true circuit construction.
All new 4-Channel exterior design
Cabinet and control panels are visual symbolizations of the Pioneer "4-channel" concept, with a recessed, framed, square tuning dial, a modernistic and logically arranged control panel, and the famous silver-black-wood Pioneer color styling.
Specifications
FM Tuner Section
Frequency Range: 88 MHz to 108 MHz
Usable Sensitivity (l HF): 2,2 µV
Capture Ratio (lHF): 3 dB
Selectivity (lHF): better than 40 dB
lmage Rejection: better than50 dB (98 MHz)
lF Rejection: better than 85 dB (98 MHz)
Spurious Rejection: better than 80 dB (98 MHz)
AM Suppression: 50 dB
Signal to Noise Ratio: 60 dB
Harmonic Distortion:
Mono : less than 0,6% (100% modulation)
Stereo : less than 0,8% (100% modulation)
Tuning lndicator: Signal Strength type and Center tuning type
Muting: Switchable to On/Off
Stereo Separation: better than 40 dB (1 kHz)
Sub Carrier Suppression: better than 32 dB
Antenna lnput: 300 Ω (balanced), 75 Ω (unbalanced)
De-emphasis switch: 75 µs/50 µs (5 line voltage model except SABS-approved model)
AM Tuner Section
Frequency Range: 525 kHz to 1605 kHz
Usable Sensitivity (lHF): 15 µV
Selectivity (lHF): better than 25 dB
lmage Rejection: better than 45 dB (1,000 Hz)
lF Rejection: better than 30 dB
Signal to Noise Ratio: better than 50 dB
Antenna: Built-in ferrite loopstick antenna
Power Amplifier Sections
Music Power Output (lHF):
180 W at 4 Ω
130 W at 8 Ω
Continuous Power Output: 43 W / 43 W / 43 W / 43 W (at 4 Ω )
1 kHz each channel driven: 30 W / 30 W / 30 W / 30 W (at 8 Ω )
Continuous Power Output: 36 W + 36 W / 36 W + 36 W (4 Ω )
1 kHz 2-channels driven: 27 W + 27 W / 27 W + 27 W (8 Ω )
Continuous Power Output: 4 x 27 W (4 Ω )
1 kHz 4-channels driven: 4 x 22 W (8 Ω )
Power Output in the range of 2O Hz to 2O kHz(2-channels driven) : 21 W + 21 W (8 Ω , Harmonic Distortion less than 1%)
Harmonic Distortion:
Less than 1% (Continuous Power Output)
Less than 0.05% (8 Ω 14 W + 14 W/14 W + 14 W Power Output)
lntermodulation Distortion:
Less than 1 % (Continuous Power Output)
Less than 0.1% (8 Ω 14 W + 14 W / 14 W + 14 W Power Output)
Power Bandwidth (lHF): 10 Hz to 100 kHz (8 Ω , Harmonic Distortion less than 1%)
Frequency Response: 5 Hz to 100 kHz, ±3 dB
Input Sensitivity/lmpedance (1 k Hz Continuous Power Output): 400 mV/70 k Ω
Speakers: 4 to 16 Ω
Damping Factor: 35 (8 Ω , 1 kHz)
Preamplifier Section
Output Voltage: 400 mV (rated output)
Harmonic Distortion: less than 0,5%
Frequency Response: 10 Hz to 40 kHz ±3 dB
Input Sensitivity/lmpedance (1 kHz, for rated output)
Phono 1 Mag : 2 mV / 50 k Ω
Phono 2 Mag : 2 mV / 50 k Ω
Mic : 8 mV / 120 k Ω
Aux 1, 2 : 170 mV / 130 k Ω
Tape Monitor 1, 2 : 170 mV / 130 k Ω
Recording Output: Tape Rec : 170 mV (Pin jack)
BASS Control: -12 dB, +11 dB at 100 Hz
TREBLE Control: -8,5 dB ; +10,5 dB at 10 k Hz
LOW Filter: -6,5 dB at 50 Hz (6 dB/oct)
HIGH Filter: -11,5 dB at 10 kHz (6 dB/oct)
Equalization Curve: Phono RIAA standard
Loudness Contour: +11,5 dB / 100 Hz +7 dB / 10 kHz (Volume -40 dB)
Hum and Noise (lHF Short circuit, A Network):
Phono : better than 75 dB
Aux : better than 90 dB
MISCELLANEOUS
Semiconductors: 3 FETs; 2 ICs; 77 Transistors; 33 Diodes
Power Requirements: 110, 120, 130, 220, and 240 V 50/60 Hz
Power Consumption: 250 W (max)
AC Outlets: 1 x switched, 1 x unswitched
Dimensions (W x H x D): 509 x 172 x 377 mm (20" x 6-3/4" x 15-5/8")
Weight Without package: 15,6 kg (34 lb 5 oz)
With package: 18,6 kg (40 lb 15 oz)
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