Harman Kardon 50 Owners Manual - Page 7

SPEAKER

PHASING

The

speakers

in

a

stereo

or

quadriphonic

music

system

must

all

work

in

unison,

pushing

or

pulling

the

air

in

the

same

direction.

If

the

speakers

are

connected

"out

of

phase"

they

will

move

in

opposite

directions

causing

cancellation

of

certain

bass

frequencies

while

simultaneously

causing

a

dis-

orientation

of

sound.

Checking

for

proper

phase

and

correcting

the

phase

relationship

of

the

speakers,

if

required,

is

quite

simple.

STEREO

MODE

1.

After

connecting

your

speakers,

place

the

receiver

in

the

MONO

mode

of

operation

and

the

BALANCE

CONTROL

to

the

exact

center

of

its

rotation.

2.

Play

a

record,

tape

or

FM

broadcast

which

has

a

single

speaking

or

singing

voice,

or

a

solo

instrument.

3.

The

voice

or

instrument

should

appear

to

be

emerging

from

an

area

somewhere

in

the

center

of

the

two

speakers.

If

the

voice

seems

to

come

from

both

speakers

independently,

the

speakers

are

out

of

phase.

4.

If

you

determine

that

your

speakers

are

out

of

phase,

merely

disconnect

the

leads

from

only

one

of

the

speakers

and

reverse

them.

Your

stereo

system

will

now

be

in

phase.

This

completes

the

connection

of

your

speakers

for

stereo

operation.

It

should

be

noted

that

it

is

not

necessary

to

match

the

impedance

of

the

speakers

to

the

receiver

since

the

50+

is

a

solid

state

instrument

and

can

accommodate

all

speakers

ranging

in

impedance

from

4

to

60

ohms

with-

out

special

transformers.

NOTE:

IT

SHOULD

BE

NOTED

THAT

IN

ORDER

TO

OBTAIN

OPTIMUM

PER-

FORMANCE,

EACH

PAIR

OF

SPEAKERS

SHOULD

BE

OF

THE

SAME

DESIGN.

4

-CH

MODE

1.

After

all

speakers

have

been

connected,

place

the

50+

in

the

MONO

mode

of

operation.

Set

the

FRONT

VOLUME

CONTROL

to

a

normal

level,

but

permit

the

BACK

VOLUME

CONTROL

to

remain

completely

off.

2.

Follow

procedure

2-4

as

outlined

under

STEREO

MODE.

3.

Once

your

front

speakers

are

in

phase,

turn

the

FRONT

VOLUME

CON-

TROL

to

zero

level

and

set

the

BACK

VOLUME

CONTROL

to

a

normal

level

and

depress

the

SQ

MATRIX

switch.

4.

Play

a

record,

tape

of

FM

broadcast

which

has

a

single

speaking

or

singing

voice,

or

a

solo

instrument.

5.

The

voice

or

instrument

should

appear

to

be

coming

from

both

speakers

independently.

If

the

voice

seems

to

come

from

an

area

somewhere

in

the

center

of

the

two

speakers,

you

are

out

of

phase.

You

will

note

that

the

phasing

procedure

for

the

rear

speakers

is

completely

opposite

to

that

of

the

front

speakers.

This

is

due

to

the

inherent

phase

reversal

in

the

electronics

of

the

SQ

matrix

system.

6.

If

you

determine

that

your

BACK

speakers

are

out

of

phase,

merely

dis-

connect

the

leads

from

only

one

of

the

speakers

and

reverse

them.

Your

quad

system

will

now

be

in

phase.

REAR

PANEL

CONNECTIONS

STEREO/4-CH

REAR

PANEL

SWITCH

The

50

+

receiver

is

shipped

with

the

STEREO/4-CH

switch

in

the

4

-CH

mode.

A

special

safety

latch

is

fitted

next

to

the

switch

to

prevent

throwing

the

switch

accidentally

while

the

receiver

is

turned

on.

If

you

plan

to

use

the

50+

as

a

DOUBLE

-POWER

STEREO

receiver,

first

turn

off

the

unit,

remove

the

safety

latch

and

throw

the

STEREO/4-CH

switch

to

STEREO.

NOTE:

After

changing

position

of

this

switch

ALWAYS

replace

the

safety

latch.

The

two

front

channels

now

have

the

capability

of

delivering

double

power

to

your

speakers.

NOTE:

WHEN

THE

STEREO/4-CH

SWITCH

IS

IN

THE

STEREO

POSITION

THE

BACK

SPEAKERS

ARE

INOPERATIVE.

IF

YOU

WISH

TO

USE

THE

RECEIVER

TO

POWER

FOUR

SPEAKERS

IN

THE

4

-CH

MODE,

FIRST

TURN

OFF

THE

RECEIVER,

REMOVE

THE

LATCH

AND

THROW

THE

STEREO/4-CH

SWITCH

TO

4

-CH.

REPLACE

THE

PROTECTIVE

LATCH.

6

Harman Kardon 50 Owners Manual - Page 7

Speaker, Phasing, Panel, Connections

Page 7 highlights