Harman Kardon CIT25 Owners Manual - Page 8

5ubsonlc

Filter

The

SUBSONIC

(22)

circuit

helps

control

the

acoustic

conse-

quences

of

warped

records

and

turntable

resonance.

If

you

can

see

your

speaker's

woofer

cones

visibly

flutter

in

and

out

when

you

play

a

record,

subsonic

frequencies

are

present.

While

directly

inaudible,

subsonics

can

rob

amplifier

power,

cause

intermodulation

distortion

at

audible

frequencies

and

actually

damage

woofer

cones

if

the

movement

is

violent

enough.

The

Citation

25's

SUBSONIC

filter

circuit

reduces

sub

-bass

frequencies

at

6dB

per

octave

below

15

Hz.

Audible

bass

response

will

not

be

significantly

affected

by

this

action,

so

you

may

leave

this

button

pressed

in

whenever

you

play

phonograph

records.

While

the

subsonic

filter

circuit

cuts

inaudible

(but

potentially

destructive)

sub

-bass

frequencies,

the

HI

CUT

filter

(23)

can

be

used

to

reduce

audible

(but

unpleasant)

high

frequency

hiss.

This

circuit

reduces

frequencies

above

6000

Hz

at

the

rate

of

6

dB/octave.

Since

your

range

of

hearing

extends

as

high

as

20,000Hz,

the

HI

CUT

filter

should

only

be

used

on

video

or

audio

sound

sources

winch

have

a

noticeably

high

level

of

noise.

Make

sure

the

button

is

in

its

OUT

position

when

listening

to

music

or

video

sound

which

is

relatively

hiss

-free.

0

The

MONO

button

(24)

combines

left

and

right

channel

signals

and

routes

their

sum

to

both

power

amplifier

channels.

It

has

several

purposes.

The

most

obvious

application

for

this

switch

is

with

mono

records,

such

as

old

45's,

78's

and

many

excellent

classical

I.P's

you

may

have

collected.

NOTE:

It

is

not

necessary,

however,

to

engage

the

Mono

button

when

listening

to

Compact

Discs

of

older

albums

which

have

retained

the

original

mono

format.

Another

use

is

with

the

input

from

a

mono

VCR.

Engaging

the

MONO

button

will

route

the

sound

to

both

left

and

right

speakers.

You

can

also

use

the

MONO

button

as

a

means

of

testing

speaker

phase

during

system

hook-up.

After

connecting

your

speakers

to

their

power

amplifier,

play

a

stereo

record

with

a

vocal

or

instrumental

that

images

in

the

center

between

the

two

speakers.

While

sitting

in

a

normal

listening

position

in

front

of

and

between

the

speakers,

have

someone

switch

the

MONO

button

on

the

Citation

25

in

and

out.

There

should

be

no

change

in

the

intensity

or

imaging

of

the

vocal

or

instrumental.

If

there

IS

a

change,

one

of

the

speakers

has

been

connected

out

of

phase,

which

results

in

poor

stereo

imaging

and

a

diminution

of

bass.

Re

-check

the

polarity

of

your

speaker

-to

-

amplifier

connections.

0cartridge

6'elector

To

the

right

of

the

MONO

button

is

the

MOVING

MAGNET!

MOVING

COIL

cartridge

input

selector

(25).

The

normal

(OUT)

position

selects

the

Citation

25's

input

for

regular

moving

magnet

cartridges

and

high

output

moving

coil

cartridges

with

an

output

rating

of

at

least

2.2mV.

The

"IN"

position

switches

to

the

moving

coil

inputs

and

engages

a

special

MC

step-up

amplifier

stage.

Capacitance

and

resistance

trim

adjustments

are

also

provided

on

the

Citation

25's

rear

panel

to

further

optimize

MM/MC

performance.

Note

that

you

can

connect

both

MM

and

MC

cartridge

inputs

to

the

Citation

25

and

use

this

selector

button

to

switch

between

them.

Ojitput

This

set

of

selectors

mirrors

the

configuration

of

the

playback

source

selector

buttons

on

the

upper

front

panel.

However,

they

select

the

source

for

RECORDING,

rather

than

listening.

As

with

the

playback

selectors,

the

SOURCE

(30)

button

activates

the

next

five

record

sources:

AN

1

(31),

NV

2

(32),

CD

(33),

TUNER

(34)

and

PHONO

(35).

This

system

lets

you:

1)

record

video

and

audio

from

TV,

LaserDisc

or

CDV

(connected

to

the

A/V

1

&

A/V

2

sources)

unto

one

OR

two

VCR's.

2)

dub

video

and

audio

from

one

VCR

to

another.

3)

record

audio

from

tuner,

CD,

tape

or

turntable

onto

your

audio

cassette

recorder.

4)

record

audio

from

those

sources

onto

VHS

Hi-Fi

video

tape.

It

is

important

to

note

that

once

a

RECORD

SOURCE

has

been

selected

(using

buttons

26-35),

this

signal

is

sent

to

all

connected

components

which

are

capable

of

recording.

To

choose

which

of

them

to

record

with,

set

those

units

to

their

RECORD

mode.

•

For

example,

if

you

have

a

stereo

'EV

hooked

up

to

A/V

1,

pressing

RECORD

OUTPUT

AN

1

(31)

will

send

video

and

audio

to

VCR

1

and

VCR

2

(and

audio

only

to

TAPE

I

and

TAPE

2).

If

you

wish

to

make

one

videocassette

copy,

simply

set

your

VCR

1

to

record.

If

you

wish

to

make

TWO

copies,

activate

VCR

1

and

VCR

2.

Note

that

you

could

also

make

one

or

two

audio

soundtrack

copies

at

the

same

time

with

TAPE

1

and

TAPE

2,

since

the

TV

sound

is

also

automati-

cally

routed

to

them.

Harman Kardon CIT25 Owners Manual - Page 8

Filter

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