Harman Kardon AX20 Owners Manual - Page 9

TECHNICAL

EXPLANATION

OF

THE

CONTROLS

Bass

and

Treble:

These

controls

provide

the

full

range

of

tonal

adjustment

necessary

for

high

fi

delity

listening.

These

controls

can

either

boost

or

cut

the

bass

and

treble

tones

of

your

monaural

system.

The

controls

should

be

set

in

accordance

with

your

hearing

preference,

speaker

characteristics

and

room

acoustics.

Loudness

Control:

This

control

adjusts

the

volume

level

of

any

program

material

fed

into

your

high

fidelity

system.

Its

effect

can

he

modified

by

the

CONTOUR

Switch.

Contour

Switch:

One

of

the

limitations

of

human

hearing

is

its

tendency

to

lose

sensitivity

to

the

very

low

pitched

sounds,

as

the

program

sound

level

is

reduced.

It

is

this

characteristic

(known

as

the

Fletcher

-Munson

effect)

which

causes

one

to

play

music

programs

at

high

listening

level

in

order

to

experience

the

full

rich

tone

available

from

fi

ne

modern

recordings.

The

Harman-Kardon

CONTOUR

Switch

compensates

for

the

Fletcher

-Munson

effect,

thus

eliminating

high

listening

levels

as

a

requisite

for

full

enjoyment

of

reproduced

music,

For

low

level

listening

throw

the

CONTOUR

Switch

located

on

the

front

panel

to

the

"ON"

-position.

You

will

note

how

the

low

frequencies

become

more

apparent

while

the

volume

level

remains

unchanged.

Balance

Control:

This

control

has

no

function

in

monaural

listening

and

should

be

left

in

the

center

position.

If

rotated

to

either

extreme

position,

it

would

completely

shut

off

the

preamplifier

on

that

side.

Mode

Switch:

The

only

application

for

this

switch

in

monaural

operation

is

to

select

be-

tween

the

two

preamplifiers.

This

allows

for

double

the

usual

number

of

input

jacks

found

on

ordinary

monaural

amplifiers.

The

STEREO

NORMAL

and

MONAURAL

RIGHT

positions

are

identically

connected

and

will

activate

the

Right

preamplifier,

therefore

switching

on

all

program

material

connected

to

this

preamplifier.

STEREO

REVERSE

and

MONAURAL

LEFT

are

identically

con-

nected

and

will

activate

the

Left

preamplifier.

For

simplicity,

it

is

suggested

to

use

only

the

MONAURAL

RIGHT

and

MONAURAL

LEFT

positions

on

the

MODE

Switch

for

monaural

operation.

Switch

to

MONAURAL

RIGHT

or

MONAURAL

LEFT

as

a

function

of

the

preamplifier

you

wish

to

use.

Function

Switch:

The

FUNCTION

switch

selects

the

desired

type

of

program

source

and

has

four

positions.

TAPE

HD

selects

your

tape

deck

plugged

into

either

the

LEFT

or

RIGHT

TAPE

HD

jack

located

on

the

rear

panel.

PHONO

selects

either

your

Harman Kardon AX20 Owners Manual - Page 9

TECHNICAL, EXPLANATION, CONTROLS, Treble, Loudness, Control, Contour, Switch, Balance, Function

Page 9 highlights