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)
