Pioneer QX-646 Owners manual

OPERATING

INSTRUCTIONS

(Dr:roNEEFl'

Thank

a Pioneer

solid state receiver

of 4-channel

tapes or

SQ matrix records

speaker

you

for the

4-channel receiver,

sound in all

records

disc

systems at the

confidence

lead

will

its varieties:

(CD-4),

and

broadcasts. lf

moment, the

shown us in

model

QX-646.

you

into

regular

purchasing

This

the exciting

discrete 4-channel

(RM)

matrix

you

only

QX-646

will

4-channel

world

as well as

have

two

also

serve

as a 2-channel receiver

4-channel sound by adding

To develop its

bined with other components

of equally

deck)
lowing

this receiver's

operating

full

many

until

two more speaker

potentials,

quality.

high

instructions carefully

possibilities

you

decide to

the

QX-646

(speakers,

please

Also,

to make full use of

and features.

step up into

systems.

must be com-

turntable,

study the fol-

tape

LINE VOLTAGE

The

QX-646

operates

one

of the five line voltages;

220Y

and 240V.

your

If

proper

the

described below.

CHANGING LINE

FUSE

To remove

the line
by the arrow.

unit. Put

voltage
edge

of the

selector is

A l-ampere

240V

120V

is correct,

FUSE

If

the fuse

operation

or 130V

REPLACEMENT

the fuse

is

available

only on L20V,

is

latter

QX-646

line voltage

the

by following

VOLTAGE SETTING AND

the fuse, turn

voltage selector in

Then remove

the fuse

marking

plug.

changed, check

fuse is

replace

blows, remove

with a new one.

plug

can be seen

Whenever

to be used for

and

a 2-ampere fuse

operation.

cap.

in

and the other operates on

so that

AND FUSE

two models; one model

110V, 1,20V,130V,

model, set

the

fuse

the

the

the

cap located

direction

fuse

the

through the cut in

position

the

the rating

either 220Y

If

the

rating of the

the fuse

cap and replace

the

procedure

indicated

plug

from

proper

the fuse.

of

for 110V,

unit

of

to

on

the

line

the
the

or

fuse

CONTENTS

LineVoltageandFuse

QX-646

Composition

Features

of

a4-channelStereoSystem

for Operating

Hints

Performance

and

CD-4DiscRecords

Speaker

Antennas

Systems

PlacementandConnections

and

-

Ground Connections

.

ConnectionofTapeDeck.

Connectionof

Turntable

ConnectionDiagram

...

.......

FrontPanelFacilities..

PreparationsbeforeOperation

FMandAMReception..
RecordPlaying
UsingtheAUXJack.

....2

. . . 3

. . .

.....

......5

...

. . . . . 7

......

.....9

...11
...

..74

.....15

.....15

4

6

8

9

13

BeforeCD-4RecordPlaying

... . .

15

6a

......

......

......

.....20

"b-qffiw:

UsingaTapeDeck.

AboutCD-4Record

Matrix4-channelDecoder

Conditions

forMalfunction

Frequently

....

Mistaken

.

Specifications...

2

L7

18
19

..2L

TJIONE€R

OX.646

Combines

in

One Unit

Exciting

varieties;
tape,

an exclusive

4-channel sound is

discrete 4-channel

discrete 4-channel

FEATURES

All Current

phono

SQ matrix records

Extracts

Sources

The built-in

2-channel

wrap-around
sound

giving your

sound.

2-channel

Accepts

The

rear

can

possible
ments in the

program

Versatile

The

including speaker

switches, a tape

monitoring

2-channel

FET-equipped

The FM

improve

employs

numerous

tuner's
works

excellent

linear

Built-in

Sensitive

not

4-channel

"regular

program

4-channel sound, bringing to life

components found in

present

(lf you

wish,

stereo fashion, too.)

2 Pairs

QX-646

speakers, for a total of

be turned

can drive one

on and off with

to

have two different

listening room and to

souces or

Auxiliary

QX-646

according

FM dial

is fully equipped

the front

as well

as 4-channel tape

FM Tuner

tuner is equipped

selectivity

one hybrid dnd

transistors,

sensitivity and

to the time

channel

and the signal meter.

AM Ferrite

and highly directional.

required

in most

4-channel

yours

System

in all four of

from open-reel and

RM

(CO-+

Oisc record with

(regular

matrix) and

disc record

cartridge),

and broadcasts.

Sound from

2-channel Program

matrix" circuit can convert

sources

of Rear

personal preferences.

(records,

stereo LPs a totally new and

you

can

Speakers

pair

six speakers. The rear speakers

tapes, FM

practically

play

any record, and

them

in conventional

of front plus

push-button.

a

4-channel speaker

select one according

two

This makes it

Circuits and Control

with auxiliary controls

on/off and rear speaker

monitor switch, a headphone

channels only), and terminals

equipment.

with an FET

and sensitivity.

one

ceramic filters,

selectivity.

switching system and

separation. Tuning is

Bar Antenna

cases.

'Also,

monolithic lC, replacing

etc., and raising the

The

An outdoor

A/B selector

front end

in its

the lF

FM

MPX

made easy by the

AM antenna is

its current

cartridge

regular

stereo)

the echo

exciting

pairs

arrange-

jack

stage

decoder

boasts

into

(for

for

of

to

to

Low-distortion Audio Amplifier

Both tone controls and

improved

power amplifier

and-true

Looks

To

be
whose

performance

is easier

complete
according
in a natural

frequency

circuit

as lmpressive as lt

response accuracy and flatness

quasi-complementary

is a

construction.

this 4-channel receiver

applied

it is a rather large, impressive looking unit

-

outward appearance

and versatility. The dial

to read.

with

to

walnut cabinet.

Your operation becomes much

program

the

desired

operation, and the unit comes installed

equalizatlon

Sounds

the

already hints at its superb

and mode indicator lighting

amplifier operate

design, a

word "compact"

and

PE RFORMANCE

4-Channel

With a 4-channel stereo

player

channel

tion,

record with a stereo

CD-4

4-channel Reproduction from Matrix

Source

The

production

broadcasts. The mode switch has

matrix

take either

to

Matrix Reproduction

A 2-channel

can be

matrix

SQ

ment

2-channel Stereo Performance

Conventional

through

front; left-side speaker system and right-side

tem.

Stereo Performance

installed,

playback

the

QX-646

phono

self-contained

and

reproduced

the

QX-646

programs

of

can reproduce a

turntable equipped

cartridge.

matrix circuit

from

matrix 4-channel records or

matrix

SQ

these

of

signal

forms.

from

in 4-channel form

circuit. ln this case, the

over ordinary

an

2-channel stereo reproduction.

2-channel stereo

arrangement or two speaker systems

tape

deck or cartridge tape

provide

can

recorded

on tape. ln addi-

discrete 4-channel disc

with an exclusive

4-channel

permits

positions

reproduction, allowing

from

2-channel

record or

a

Stereo Source

FM stereo

via the regular

result is an improve-

performance

can be

for

fhe

T

ied-

tri t

can not

section

meter

easier,

a

discrete 4-

4-channel re-

FM stereo

for

regular

reproduction

broadcast

provided

in the

speaker sys-

up

or

3

4-CHANNEL STEREO SYSTEM

COMPOSITION OF

A

4-channel stereo system with the

two or even

a tape deck

player,

etc.

(see

pairs

three

(reel-to-reel

Fig. 2).

of

or cassette),

A

QX-646

speaker systems, a turntable,

a cartridge

INSTALLATION

For

safety

appearance of each component,

them in

.

In

direct sunlight or near

.

In

a

.

In an unstable

or inclination.

Also, when

poorly

interference signals,

ting

and reliability

any of the

poorly

following

ventilated, dusty,

place

playing

shielded electronic

and to

places:

heating units.

where

records,

CD-4

equipment or equipment emit-

(e.9.

protect

please

damp

do

place.

not install near

or

there is significant vibration

television

frequency characteristics up to 45kHz are

CD-4 records.

CARTRIDGE TAPE

PLAYER

can include

tape

the

outward

do not install

set), since

required for

high

FRONT

SPEAKER

SYSTEMS

TU R NTAB

TAPE

4-channel

or 2-channel )

A WORD ABOUT ROOM

quality

The

of reproduced

to the size and shape of the room,

of walls, floor

arrangement of furniture.

sound

a
flecting surfaces, and/or too

usually

LE

DECK

ACOUSTICS

ox-646

iound varies

and ceiling and

the amount and

Too harsh or

results from too many

low

a

according

the materials

"bright"

ceiling. This

condition is improved by having ample

area or covering the wall

speakers)

the

hand, too

"soak

ness."

irregular

up"

Furniture

reflection

many

the

a thick curtain. On

with

absorbing

sound,

resulting

may be

of the sound.

(especially

surfaces will tend to

in a certain

rearranged to

that facing

the

hard

carpet

other

"dead-

provide

re-

REAR SPEAKER

SYSTEIVIS

ABOUT SPEAKER SYSTEMS

For the best 4-channel

desirable

same

requirement,

selected

be

o

Select two speaker

characteristics, and arrange

o

For

tems as

to use four

characteristics. if it is difficult

it is suggested

and arranged

the rear channels,

similar to the front

stereo

speaker systems having

that speaker

as follows:

systems having the

select two

B

performance, it is

to satisfy this

systems

in the front.

them

speaker

speakers as

possible.

Fig.2

the

same

sys-

PION€EIT

HINTS

TURNTABLE

The CD-4

signals

45kHz.

the recording level is

note

take

CD-4 disc record reproduction

o

The PHONO

vibrations, revolve at constant rotational speed with-

out wow

to-noise ratio.

.

The
is, can

it

must

to adjust the tonearm so that the tracking

be distributed

of the record

PHONO

To

effectively reproduce the wide

CD-4 records

record

disc

Make

phono

down vertically onto the record surface when
cartridge

remain the

FOR

disc

based on a

Compared to conventional 2-channel disc records,

OPERATING

record

is engraved by high

30kHz

carrier, which extends up to

CD-4 DISC

frequency

low. Therefore, it is desirable to

of the following suggestions connecting the

tumtable.

MOTOR must operate almost

flutter, and

and

TONEARM must have sufficient trackability,

track the

have

CARTRIDGE

reproduction to use an exclusive cartridge.

groove

an anti-skating device and

equally

groove.

over a

long

certain that the stylus is in

cartridge is

is replaced,

same as before.

installed,

so

produce

with

light

an excellent

tracking

lateral balance

to both the left and

frequency range

period,

that separation and sound

it is

essential

position

and that the

without

force.

force can

right

for

when the

stylus

the

RECORDS

signal-

that

Also

walls

of

CD-4

goes

phono

quality

RECORD

Since the
engraved, even
pleasant

can scratch

Since the warped

it is

Before

with high

be washed

STYLUS

If dust clings

become
and the disc is

The stylus

playing

HANDLING
groove

noise

the record

desirable

and after

quality
with water.

CLEANING

poor,

must always be cleaned

is

over. If

of the CD-4

a small amount of

poor

and

disc

to exercise utmost care in handling them.

playing

cleaner, not a

to the stylus, sound

4-channel stereo is impossible to reproduce,

damaged.

dust

fully with commercial

record is delicately

disc

can cause un-

dust

sound

surface, reducing its service life.

record

the

is difficult

available alcohol stylus cleaner.

quality.

is never reproduced exactly,

disc,

spray-type.

quality

to

In addition, it

it

should

be cleaned

It must not

and separation

whenever

remove, clean care-

a record

SPEAKER

SYSTEMS-PLACEMENT

AND

CONNECTIONS

SPEAKER SYSTEM

Fig.

As shown

speakers, one

rear.

shaded area of

in

each on the

Locating the rear

effect. As model

systems to be

front left and

at

systems)

Fig.3.

fied speaker

turer's instructions.'

CONNECTION

Use common

ent colors

Speaker wire

Connect the

can be

4-channel

Some

ailangements.

two-pole

for the

is often supplied

speaker

output terminals

on the

"L")

placed

(FRONT

3

at the

front

SPEAKERS marked

Connect the speaker

output terminals

on the,QX-646.

"L")

the rear right to speaker

SPEAKERS marked "R").

To

connect

the

output terminals

Be

on

the minus

to the

For

to

sure

the

connection,

connect

QX-646

(

-

(

terminal

-

)

from the lead wires.

prevent

to

push

hair

the red clamp-lever

the wire end into the hole,

wire will be clamped securely

push the black clamp-lever

side,

insert the wire and release the lever.

ARRANGEMENTS

4-channel system

the

3,

left and

speakers anywhere

figure will

this

QX-646

connected,

right, and

placed

permits

two speaker

others

within

records and

Please

wires,

lead

two leads

with the

placed at the

(FRONT

1

CH

QX-646.

Likewise, connect

right to speaker

placed

A CH

Likewise, connect

(REAR

2

at the

output

other

B,

to the

terminal

)

remove about

speaker systems to the speaker

the same as

do

+

(

plus

the

+

(

terminal

)

(black

on the speaker.

If the wire core

wires from sticking

on the terminal

then release

in the terminal.

1Omm

employs

right at the

give

an ample

total

a

systems

(two pairs

front

in

the blue-

4-channel

of six speaker

are

of speaker

the blue-shaded

call for speci-

tapes

manufac-

observe

preferably with differ-

for easy

front

SPEAKERS

the

identification'

speakers.

left to speaker

the speaker

output

terminals CH

"R").

Ieft to speaker

rear

SPEAKERS

(red

placed

terminal)

terminals

above.

terminal

)

speaker

A CH 4

on the speaker,

terminal)

on the

(1/3")

is stranded, twist

On

out.

QX-646

of insulation

+

(

the

up and insert

the lever

On the

the terminal

on

four

and

placed

area of

marked

marked

(REAR

and

side,

)

the

-

(

-

down,

at

SPEAKER

SPEAKER

RIGHT CHANNEL

it

)

RIGHT CHANNEL

SYSTEM

OUTPUT

SPEAKER

"w=

PLACEMENT

TE RMINALS

LEFT CHANNEL

SYSTEMS

SPEAKER

Strip the wires
their

Then twist

LEAD WIRES

ends.

them.

Fig.3

4

Fig.

of

SPEAKE

LEAD

R

WIRES

Fig.

5