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OX.646
FEATURES
Combines
All
Current 4-channel
System
in One Unit
Exciting
4-channel
sound is yours
in all four
of
its
current
varieties; discrete 4-channel
from
open-reel
and
cartridge
tape, discrete
4-channel
disc record
(CO-+
Oisc
record with
an
exclusive phono cartridge),
RM
(regular
matrix)
and
SQ matrix
records
and
broadcasts.
Extracts 4-channel Sound
from
2-channel Program
Sources
The
built-in
"regular
matrix" circuit
can convert
regular
2-channel
program
sources (records, tapes,
FM
stereo)
into
wrap-around 4-channel sound, bringing
to
life the
echo
sound
components
found
in
practically
any
record,
and
giving
your
present stereo LPs
a
totally
new and exciting
sound.
(lf
you
wish,
you can play them
in
conventional
2-channel stereo
fashion, too.)
Accepts
2
Pairs
of
Rear Speakers
The QX-646
can
drive
one
pair
of
front
plus
two
pairs
of
rear
speakers,
for
a
total
of
six
speakers.
The
rear
speakers
can
be
turned
on
and
off with
a
push-button. This
makes
it
possible
to
have
two
different
4-channel
speaker
arrange-
ments
in the
listening
room
and
to
select
one
according
to
program
souces
or
personal
preferences.
Versatile
Auxiliary
Circuits and Control
The
QX-646
is fully
equipped
with
auxiliary
controls
including
speaker
on/off
and rear
speaker
A/B
selector
switches,
a
tape
monitor switch,
a
headphone
jack
(for
monitoring
the
front
channels
only), and
terminals for
2-channel
as
well
as
4-channel tape
equipment.
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 dnd 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
signal meter.
Built-in AM Ferrite
Bar
Antenna
Sensitive
and
highly
directional. An
outdoor
AM
antenna
is
not required
in
most
cases.
TJIONE€R
Low-distortion Audio Amplifier
Both tone controls and
equalizatlon
amplifier
operate
improved frequency
response
accuracy
and
flatness
power
amplifier
is
a
quasi-complementary
design,
a
and-true
circuit
construction.
Looks
as
lmpressive
as
lt
Sounds
To this
4-channel receiver
the word "compact"
can
not
be applied
-
it
is
a
rather
large,
impressive
looking unit
whose
outward
appearance
already
hints
at
its
superb
performance
and versatility.
The
dial and
meter
section
is
easier
to
read.
Your
operation
becomes
much
easier,
complete
with the
program and mode indicator lighting
up
according
to
desired
operation,
and
the
unit
comes installed
in
a
natural walnut
cabinet.
PE
RFORMANCE
4-Channel Stereo Performance
With
a
4-channel
stereo
tape deck
or
cartridge
tape
player installed,
the
QX-646
can
provide
a
discrete
4-
channel playback
of
programs recorded
on tape.
ln
addi-
tion, the
QX-646 can
reproduce
a
discrete 4-channel
disc
record
with a
stereo
turntable
equipped
with
an
exclusive
CD-4
phono
cartridge.
4-channel
Reproduction
from Matrix
4-channel
Source
The
self-contained
matrix circuit
permits 4-channel
re-
production
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 Stereo Source
A
2-channel signal
from a
record
or
FM
stereo broadcast
can
be
reproduced
in
4-channel
form via the
regular
or
SQ matrix
circuit. ln this
case,
the result is an
improve-
ment 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;
left-side
speaker
system
and
right-side
speaker
sys-
tem.
for
fhe
ied-
T
tri
t
3
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