dbx dbx 224 dbx 222

dbr'Mod

et222

type

ll noise

INSTRUCTION

reduction

for

tape

system

& disc

MANUAL

INDEX

BR I EF

OPERATI

Panel

Rear

Panel

Front

How to Use the

OUICK-REFERENCE GUIDE TO dbx

NG INSTRUCTIONS

Function

Select

Buttons

on

OPERATION

222

Your

222

INTRODUCTION CONNECTIONS & OPERATION

Basic Signal Connections and Operation

Dubbing

Dubbing a dbx

Using the 222in Conjunction Using the 222

Copying a Making Making

SETTING dbx

a

THE LEVEL ADJUST CONTROLS

PRODUCT WARRANTY

SPECIFICATIONS

Encoded

dbx

a

Encoded

with

dbx-Encoded Tape

Non-Encoded

dbx-Encoded

Equalized

an

Copy of a dbx-Encoded

Copy

Disc onto a Disc

onto a

with

Speaker System

from a

FACTORY

&

Tape in Tape in Non-Encoded

Graphic

a

Non-Encoded Tape

Encoded Form

Equalizer

Master Tape

SERVICE

Form

10 10 10 12

13 14

15

SCHEMATIC 16

2

3

4

7

8

I

9

dbx@

Registered

is a

Trademark of dbx,

lnc.

WARNING:

TO

HA,ZARD, DO

TO RAIN OR

PREVENT FIRE OR SHOCK

EXPOSE

NOT

THIS APPLIANCE

MOISTURE.

BRI

EF

OPERATING

INSTRUCTIONS

Fig. 1

Notes:

preamplifier,

an equalizer,

connection

INPUTS

Connect

your preamp's

(REC

OUT

of

Loop) to these

Level Adjust

TAPE REC &

controls

without

encoding and decoding. See

for maintaining the same average signal

are

processing.

222

Model 222Rear

dbx

-

To avoid

integrated amplif

reverb

diagrams.

Preamp

cables from

TAPE OUTPUTS

the Tape

inputs.

Monitor

PLAY/ DISC PLAY fhese

Adjustment is not critical for

repetition, the word

unit or other device. See

or

Panel

ierlpreamplifier, or the tape

Receiver Connections

"preamp"

OUTPUTS

from these

preamp's

(PLAY Monitor Loop).

screwdriver adjustable

page

13 for

details

of

is used to mean

Figures 3 through I

Connect

outputs

cables

to

TAPE INPUTS

lN

Tape

the

of

level with or

proper

their

adjustment.

monitor

Vour

receiver,

loop

of

for

INPUTS Connect cables from your

PLAY to these

Mains Connection

AC

Hz

60

sources are available

dbx factory for

the

Recorder Connections

Tape

recorder's LINE,

tape

MONITOR

or

inputs.

POWE R CABLE Connect this

power

AC

outputs

source only.

outside the

Models for

continental

information.

OUTPUTS Connect

from these outputs to the

RECORD

your

tape

using the 222 only

are

decoding

not connect any

jacks.)

these

cable to a 1 17

use

LINE inputs of

or

recorder.

dbx discs.

V AC, 50 or

with other

cables

power

United States. Contact

cables

(lf

you

for

you

to

need

Fig.

Panel

Model 222

dbx

2

-

NOTE: BECORD, BYPASS, and

pressed

Front

in

at

given

a

time.

Processor

PLAY

interlocking

are

Function

Selectors

pushbuttons;

only one button

is to be

RECORD

you

when encoded

(non-encoded)

set for recording, a above the

ated; be sure

button is not engaged

LED

should

Power

Press in this button

power

AC

release the

OFF. A red

is illuminated

to the

button and

LED above the

when the

Press

this button

want to

tape from a

make

normal

program.

green

button is illumin-

"dbx DISC"

the

be OFF).

(its

to turn ON the

press

222;

turn

again

power

button

unit is ON.

dbx

a

When

LED

to

BYPASS

when

conventional

(i.e.,

from

when

or

Press

you

want

tape

non dbx-encoded tape)

a

non-encoded

a

you

want to

this

make a

to

recording

button

program,

play

conventional non-encoded

tape. When set for bypass, a

red LED above the button

illu minated.

Press

PLAY

you

when

dbx encoded tape

a

encoded disc

want

a

is

to

listen to an encoded disc while

making an encoded tape recording of that disc).

When set for

green

LED above the

is illuminated;

be sure to also

back,

the adjacent

this button

want to

play

or

(or

when

simultaneously

playback,

for disc

"dbx DISC"

back

a dbx

you

a

button

play-

press

button.

Disc

dbx

Press

button when

(decode)

you

want

an encoded

encoded The red LED above

illuminated

button and the

this

you

dbx encoded

a

to simultaneously

disc while

tape recording of

when set for

want to

the button

PLAY

listen

(or

disc

listen

making an

that disc).

is

disc decoding.

to

when

to

How

to Use The

NOTE: With

Function

RECORD,

Select Buttons

PLAY

BYPASS,

&

Your

on

push

only one button

222

at

a time.

RECORD

o

BUTTON(SI

BYPASS PLAY dbx DISC

PRESSED

IN

o

o o

A

TO MAKE

Program

encoded and sent to the

TO PLAY A dbx

Program coming

be

FOR NO PROCESSING OF

Program coming sent directly to the

coming into the

decoded and

into the 222's

to the

222's

DISC/SOURCE

dbx

Program decoded and program

the

coming into fed

TAPE RECORDER

"TO

ENCODED

dbx

ENCODED

into the 222's

to

sent

into the

"TO

"FROM

fed

EAMP

DECODING

the

to

"F

"TO PR

to the

222's

"TO

the

222's

TAPE RECORDER

the

222's

"TO

ROM

FUNCTION OBTAINED

TAPE

"FROM PREAMP

TAPE RECORDER INPUT"

PROGRAM

TAPE OUTPUT"

jacks

"FROM TAPE RECORDER OUTPUT"

"TO PREAMP TAPE

THE TAPE

"FROM PREAMP

INPUT"

OUTPUT"

TAPE INPUT"

jacks

INPUT"

TAPE

with no encoding or decoding.

jacks

OUTPUT"

jacks,

jacks

"FROM PREAMP TAPE OUTPUT"

PREAMP TAPE INPUT"

PR EAMP TAPE OUTPUT"

INPUT"

jacks

without decoding.)

jacks.

jacks

will be

of the 222.

jaeks

will

the

oI

222.

jacks

will be

coming

and

program

will be sent directly

jacks

(The

encoded

will also be

will

disc

fed

to

be

OUICK-REFERENCE GUIDE

TO dbx

222OPERATION

Make

To

a dbx-Encoded Tape

Press

1.

in

the

dbx

222's

dbx DISC button should

Place

2.

the tape

adjust record

on average-reading

under certain conditions, more

and

required.

Tape Level Adjustment.)

monitor

listening

form

This will encoded

you

For

Do

3.

not switch the 222 while making the

your

4. lf

the encoded tape as it is being

to the

function at a time, encoding

one

verify

program

prefer

may

switch to SOURCE and

ahead of

the 222.

recorder in Record mode,

level controls for an average

meters.

more information,

recorder has

tape

encoded

program

that a recording is being

particularly pleasant

is not

switch

to

listen

Recording

RECORD button.

be

out.)

(For

some tape recorders

precise

please

heads,

3

lthe

preamp's

the

to the

unencoded

(The

and

level

of

-5

settings are

recording.

you

and

you

can

only

decoding).

made,

but since

sounding,

page

wish to

will

per-

refer to

made.

222

or

TAPE MONITOR

program

13,

be

Play

To

encoded tape.

To

set

dbx-encoded

To

Tape Recording

DISC

a dbx-Encoded

Set the

1.

Press

2.

Play

Press in

1.

2. Set the

preamp's

in

the

(The

a dbx-Encoded

the dbx 222'sDISC

preamp's

its TAPE MONITOR switch to

disc.

or

Press in

button

Play

the

Play

the

should be out.)

tape

Make

1.

2.

Tape Recording

TAPE MONITOR

dbx

222'sPLAY

DISC

dbx

Phonograph Disc

INPUT SELECTOR to

Conventional,

a

dbx

222's

(or

make

normally had done before

Make a Non-Encoded Tape

To

Encoded Disc

Turn

1 .

tape

off

recorder to the

2. Turn the

Press

3.

4.

the

Set

and set the

5.

by listening through

TAPE MONITOR

You

can monitor the recording of

preamp

the

preamp

on.

in the dbx 222'sDISC and

preamp's

INPUT SELECTOR to

your

button, and

should be

button

PLAY

and

TAPE,

Non-Encoded

BYPASS button.

recording)

the

using

and

as shown

Model 222.

the

Recording

reconnect the

in

PLAY

switch

to TAPE.

loudspeakers.

to TAPE.

switch

play

the

out.)

buttons.

PHONO,

play

and

as

(The

you

the

dbx

from a dbx-

and

222

Figure 4.

buttons.

PHONO,

the decoded disc

INTRODUCTION

6

The

the

of

tape

ln

addition,

made

normally

tape noise reduction system

can vastly improve

processing,

noise which

that

Taped records,

recording

tape

major

noise reduction

sources

dbx

at levels that avoid much of the distortion

occurs

virtually

original disc, taped

have no more noise

reception of the

conversation, and

from

quality

increase in absence of tape-induced

reduction

encoding or decoding a stereo system

live event. These

the

tape recordings

of

recordable

The dbx

processing,

provides

Model

reduction with

headroom in

The

dbx encoded

the tape recording

Model

222

phonograph

process

of

system

processing permits

in

tape recording.

traditionally

in recorded music. The

noise

virtually

not

recorder

tape

the

was

playback,

upon

FM

than

program;

forth,

so

present

noise

only

in the

broadcasts,

present

was

and recordings

will

genuine

due to

are

dynamic

noise.

has

222

two

switchable as

program.

in excess

a simultaneous

also

30 dB broadband tape

of

may be used

discs.

As

only reduces

performance.

heard

original

will sound

upon

be indistinguishable

improvements in the

range

channels

a

10 dB improvement in

process.

These

through leading hi-fi and record dealers, quieter

musical dynamic range.

The

to reduce

Neither can reduce

conventional disc, and

than a

dbx disc decoding circuitry is not designed

222's

noise

conventional

on

the 222's dbx tape

hiss

on a

tape

which

phonograph

noise

has

already been recorded

hacbeen

eliminates tape

recordings to

result. the dbx

a

which

noise. it

With dbx

playback

on

program.

just

like

playback.

qriginal

in

the

phenomenal

a

and the dramatic

of

pair

This

decode special

to

discs, available

are

provide

reduction

live

of

noise

for either

dbx

up to

tremendous

records.

circuits

music,

one

dbx

hiss.

be

is

the

will

Type ll

noise

40

dB

without

recording

The dbx

corresponding

the

process.

222is

fully

compatible

Type ll units, including the

140

and

Professional

I

Type difference

consideration

design

format used

ment, and

format used

tape

means that the Type

for

rior

use

Alone.

quality quality

programs.

an

and to

how

of

when

When used

extremely valuable addition to

your

maximum

The 222is not compatible with

series.

equipment, and

between the

two

for

live recording

in

corresponding

the

home high

in

ll noise

with home high fidelity equipment,

dbx 222 will dramatically

thA

your

live

tape

you

listening enjoyment. This manual

dbx 222

benefit

copying

are

properly,

functions, and

from its use,

dbx tape noise reduction makes

processing

dbx

Model

224,

systems results from the

higher

speeds

professional

with

slower speeds and smaller

fidelity

during

with

all other dbx

21, 1 20 series

vice-versa.

and larger

equipment. This

reduction system

improve

recordings,

previously

and

your

how

will

recorded

sound

you

dbx

The

equip-

is

preserrie

system

describes

can

obtain

the

tape

supe-

the

CONNECTIONS & OPERATION

Basic Signal Connections and

CAUTION:

equipment precaution, prior

lnadvertent

PLAY

Make

sure that the

installing

when

turn down

the dbx

your

to switching on the dbx

decoding of

non-encoded

model can create surging

SPKR

8F.*r55tE

our

LEFr<O

Operation

power

is

OFF on all

unit.

As

further

a

amplifier VOLUME

222fot

the first time.

programs

high volume levels.

to

O

<O >O

E

control

1222in

NOTE:

betnreen

Never

connect any other

dbx 222

the

and

electronic equipment

your

tape recorder's inputs

outpuE. This could cause inaccurate

tracking

The

the Brief

and

basic functions

Operating lnstructions

los

quality

of

in

of the dbx 222 are

the recorded

on

encode/decode

signal.

presented

page

2.

or

in

Fig.

3

Basic signal connections

-

to fr1e dbx

222

I

Dubbing a dbx

Encoded Form

in

wide

when transferring an

are

manner as any dbx

This

dynamic

then

process

connections are necessary

Press in

1.

2.

Set

switch to

PHONO.

3.

Set

normally.

4.

The tape

hear

the

this

operation.

5. After the tape

in decoded form by releasing the 222's dbx

Encoded Disc

allows

range

played

back

the 222's

your preamp

TAPE,

and

your

tape recorder to

copy will

program

in

onto a Tape

you

preserve

to

of the dbx

encoded disc to a tape. Such tapes

through the

Type I I

DISC

as follows:

INPUT

decoded

is recorded, it can

noise

Model

encoded tape.

(Figure

and

31.

PLAY

TAPE MONITOR

SELECTOR switch to

Record,

dbx encoded, and

be

form

while

low

the

noise and

reduction system

in

222

the same

No

special

switches.

record

and

you

monitoring

played

be

DISC

back

button.

will

Leave

the

MONITOR in

SELECTOR

Dubbing

in Non-Encoded Form

This

non-encoded

out

dbx

pl

ayer).

your

lf

monitoring

being recorded,

the recorder'3

your

tape

preamp's amp's TAPE MONITOR

TAPE mode.

PLAY

dbx

to

a dbx Encoded Disc

process

button in,

position

TAPE

TAPE).

is for transferring

and the

(or

onto a Tape

form onto a tape for

you

phones

(See

(such

as in an automobile

wish can

PLAY

listen

to

plug

jack.

Alternately,

OUTPUTS directly

(Monitor

INPUT

OR

Figure

4.)

a

pair

processing

tape recorder is equipped for

and

recorder's

TAPE INPUTS

preamp

its INPUT

set

a dbx-encoded disc in

future

TAPE

playback

tape

with-

off-the-tape

the tape

to

headphones

of

you

ln),

and

it is

as

connect

can

to

set the

into

your

pre-

SELECTOR to

Fig, 4 - Connections

for making a non-encoded recording from

a

dbx

encoded

disc.

Using the

you

lf

the

equalization

222in

use a

Conjunction

graphic

equalizer with

must nof

with a

be introduced between the

222'sIAPE RECORDER OUTPUTS

recorder's the

222',s

is installed in

222

inputs, or

TAPE RECORDER

between

preamp's

the

the recorder's

INPUTS.

tape monitor loop, and

Graphic Equalizer

your

sound system,

and the tape

outputs

ldeally

and

the dbx

graphic

the

and the

output

Figure preamp's graphic the equalizer

Alternately,

5. tape

equalizer's tape

equalizer is installed

power

amplifier

install the

monitor loop

and

monitor loop,

it's effect

so

comes after the dbx unit.

between

input

as shown

graphic place

equalizer

the 222in the but be sure to set

the

preamp

in

in the

9

How to

connect lhe

reverb,

processl.

Fig.

5

electronic crossover, 4-Channel decoder, etc.

dbx encode/decode

-

222 with a

subharmonic synthesizer,

(special

signal

processing

graphic

equalizer,

matrix

follows the

10

Using

the 222with an

you

lf

have

speakers

the dbx

an equalized speaker,

Electro-Voice "lnterface"

or

can be

222

tape monitor loop.

preamp's

the

Figure

Copying

To

make a dbx-encoded

encoded

Z-.OEIAPE

tape

6.

a dbx-Encoded Tape

follow

tape,

OLEFrO

ORTGBTO O O O O

<O

Equalized

connected in

The equalizer

monitor

procedure

the

EO c6

PREAMP

Speaker System

such as most Bose

series speakers,

the speaker equalizer's

should be

loop

copy

illustrated

as

from a

dbx

depicted in

;6

56

3

installed

in

I I

type

Figure

in

Fig.

7 - Copying dbx-encoded tapes

directly from one tape rscorder to

Since the encoded

processing

Outputs can be Record

7.

in

order to be copied, Tape Recorder

(Line)

Making a Non-Encoded Master

Tape

The

encoded

feeding

to

the

accomplished

of

your

nature

tape does not require

connected

lnputs.

directly to Tape

Copy of a dbx-Encoded

master tape must

slave

in either

recorder. This may be

tape

two ways, depending

of

sound system.

or

the other.

dbx-decoded

be

non-encoded tapes

additional dbx Type

"A"

Recorder

Play

"B"

(Line)

piior

the

on

ll

Fig.

inside

the

preamplifier.)

the

6

How to connecl

-

tape

monitor

lhe 222 with an equalized speaker

loop

of the speaker equalizer, which itself is in the

system.

(dbx

processing

monitor

tape

is

done

loop

of

For Sound Systems with Two Tape Monitor

lf

monitor

similar copying required

1.

dbx DISC button

2. Set

Recorder Record

For Sound Systems with One Tape Monitor Loop:

lf

preamp,

your

loops

with switching for

provisions,

(Figure

Press in

the 222's front

your preamp

"B"

to

mode.

your preamp

2

...-

e3

ra:

LEfir

O

ORTGHTOOOOO

I2I

amplifier

receiver

or

"Dub

no

special

8).

should

Play

(or

<O

O

panel

be

out.)

"Dub

to

mode and Tape Recorder

receiver) has

e F 3

-O

AMP/PREAMP |ot

O E

.O

B to

'O

connections

PLAY

A" mode,

only one

:'

?

Loops:

has two

A to B"

switch.

set

tape

TAI

RECORDER A

tape

or

are

(The

"A"

Tape

to

monitor

copy: MONITOR OUTPUTS

B's

Recorder "8"

A Method Using No

an encoded tape with

the 222. the

the 222's the

Tape Recorder B's

Tape Record to Record mode.

loop, here is

1.

Simultaneously

lnputs

by using

Press in

2.

3.

Set the Tape

the

to

you prefer, you

lf

1. Tape

dbx

preamp's

2.

3.

Recorder

222TAPE

PREAMP

Press

in

Set the

Tape

lhe 222's front

Tape Recorder

the way to make a non-incoded

connect

to the

"Y"

222's f ront

Recorder

Record

Preamp

can

only

A's

RECORDER

TAPE MONITOR

the 224's

preamp

adapters

mode.

make a non-encoded copy

output

(Figure

panel

"A"

to

& No

Special Cables:

the two

should be connected to

input, as usual. Connect

Monitor lnputs,

Record lnputs

(Figure

panel

"A"

to

RECORDER B

PR EAMP

Tape Recorder

and

9A).

PLAY

switch.

Play

mode and Tape

machines

tape

OUTPUTS not to

but instead to

98).

PLAY

switch,

Play

mode and

11

TAPE

of

and

the

Fig.

preamp

Copying dbx-encoded

8

-

having two

tape monitor

and non-encoded tapes with a

loops.

12

Making Non-Encoded Tape

a dbx-Encoded Copy from a

For Sound Systems with Two Tape

Monitor Loops:

preamp

your

lf

loops

with switching

copying

similar

or

connections are

is the same as that shown

Tape Recorder

again,

Recorder A records the encoded

Tape

The only difference

signal. switching.

Press

1.

your

2. Set

mode, set Tape mode, and mode.

Tape Recorder

For Sound Systems

Monitor monitor

Loop:

preamp

your

lf

loop, follow this

Connect

1.

to an auxiliary

Place

2.

Recorder B.

your

reverse redesignate

hooked up to the

is

Press

3.

RECORD switch.

4.

Select

Tape

5. Set

mode,

and

mode.

has

two tape monitor

"Dub

for

provisions,

no special

required. The installation

in Figure

B

copied from;

is

is in the 222

in the 222's

preamp

Recorder

RECORD switch.

"Dub

to

"8"

to

"A"

with One

has

Tape Record B's Outputs

input

on

the tape

(lf

two

them so in the

auxiliary

Tape

to be

not

is

this

tape recorders

that Tape

222.

222's f

mode

Recorder

Tape

only one

procedure.

your preamp.

copied

possible,

panel

ront

on

"8"

to

"A"

A to B"

B to A"

lo

tape

and

Recorder A

the

to

8;

Play

Record

on

preamp.

PlaY

Record

Tape

z-

e= H5

do

E

LEFr

O

o

O

ORIGHT

Fig.

Making a

9

-

from a dbx Type

copy

tape without tape monitor

(A)

to split the 222's to feed both the recorder.

(B)

no

and

the benefit of

loops.

"Y" adapter cables

Using

the

standard

Using

preamp

e9<i

l

:O c'O;O 6

<o

ooo

o

non-encoded'

ll encoded

decoded signal

preamp

cables,

at all.

otr

zs

and

two

RECORDER

B

"Y"

Adapter Cables

Fis.

Fig.

9A

98

RECORDER B

RECOROER

RECORDER A

A

SETTING

THE LEVEL ADJUST CONTROLS

For listening

controls are

able

intended to keep

the

same, and

preamp,

lowest noise. The controls are factory

and

provide

the desired

control adjusts two

balance is maintained. ln no case

stereo

the linearity of the dbx encode/decode

affect

Record

Tape

1. Connect a source of

constant level to

fairly

FM

or an

MONITOR

oscillator or test record,

standard

Press

2.

convenience, three screwdriver-adjust-

provided

the record

to

recorder, and the

optimize

Level

results channels

Adiustment

the rear

on

playback

and

level matching

dbx 222

in most

for

installations.

simultaneously,

a

typical

musical

your preamp; preferably

broadcast.

radio

switch

reference

in the 222's

to source.

Set

you

level.)

BYPASS

preamp's

the

(lf

you

can use

switch

panel.

They

levels about

between

best headroom

the

preset

Each

proper

so

their setting

does

process.

program

a record

TAPE

have an audio

kHz tone

a /

(dbx

D ISC

are

your

to

at

button

out).

your

3. Setup

record

a tape

the source

system at an average

recorder's

peaks

the

of a reel-to-reel recorder or

recorder. With average VU meters, the readings should

-10

cassette recorders. range of average levels indicated above.) Remember levels will vary

has

will f

should reach

dB to

peak

reading

ind that by experimenting

tape recorder for recording, but do not

(use

the recorder's

(i.e..

program

or

listening level

input level controls.

+3

dB for reel-to-reel and

0

(A

test tone can be set within the

depending on whether

meters or average

PAUSE

test tone) through

and adjust

program

With

dB on the

-8

peak-reading

dB

to 0 dB on a cassette

-12

your

reading meters. You

with

different recording

switch).

your

the

material,

to

dB

-3

tape recorder

Play

tape

meters

dB for

these

for

levels,

recording

enjoyment

controls, adjust the

different

you

tape,

the dbx ll

of

4. Now

5.

press

Without touching

types

can

in the

222's rear

"TAPE REC" control

read about the

SWitchCd tO

From

6.

made

be

at

Tape

This

same

Play

preamp

playing

in)

or a dbx encoded tape

For

this

Type

dbx

kHz

1

test tone. Since the adjustment is

convenience

encoded

dbx

you

after

Press

1.

same

BYPASS.

as they did with the dbx

now on, adjustments

with the

adjustment

recorder's

Level Adiustment

is

VOLUME

a conventional tape

adjustment,

ll encoded tape or, alternately, a source

you

if

only,

you

tape,

record a dbx encoded

in the

222's

music

of

achieve

recording system.

R ECORD

222's

or

better

different

results and

switch.

any of the recorder's level

panel

LEVEL

that

your

recorder's VU meters

so

of recording

input level controls.

provided

so

you

can use

control setting whether

(222

BYPASS switch

PLAY

1222

you

will need

switch

good quality

any

for

do not have a tone

can delay the

BYPASS

tape.

switch

adjustment

(dbx

types of

full

ADJUST

unit

level will

about the

you

pressed

of

listening

source or a

until

DISC

13

are

in).

a

button out).

preamp

be

your

2. Set

TAPE.

Play

3.

You can

stant

tape recorded level.

a dbx

use

a

level. For more

recording

NOTE: A f kHz

oscillator

or a test

Type

tape

program

of

accurate settings,

a 1

of

kHz tone at

recording

tape

record

MONITOR

TAPE

ll encoded

material

can be made using

as a signal

tape on

with fairly con-

you

VU to 0 VU

-3

source.

Switch

your

can

lf

the lkHz

to

recorder.

use a

an

PRODUCT

dbx

WARRANTY &

FACTORY SERVICE

14

tone is used, it makes no tape is dbx

4. Adjust the

control

222's BYPASS and in,

the

1 kHz tone remains

switching

NOTE:

pr*emphasis

process,

vocals)

Disc Play Level

This adjustment is

same

playing

Tape monitor switch not

(preamp

and

1.

2. Set

switch at

3.

'

4. Ad

"DISC PLAY"

passages,

preamp's

the

moved

NOTE: Due

pre-emphasis

process,

vocals)

Type ll

so that on

encoded.

222'.s

louder

PLAY

levels

are approximately

at the same

between

Due

BYPASS

changes in frequency response

to

and deemphasis in

concentrate on midrange frequencies

making

when

this comparison.

Adjustment

provided

preamp

PLAY

Press

Play

VOLUME control

a conventional

Tape monitor

switches

pressed

in the 222's DISC

preamp

your

PHONO;

a dbx encoded disc

just

TAPE MONITOR

the

222's

control

levels

the

are

TAPE MONITOR

between

concentrate

when making

SOURCE and

changes

to

and deemphasis in

on

this comparison.

difference whether or

LEVEL ADJUST

program passages,

switches are alternately

and

same

the volume

PLAY).

the dbx

you

so

level when

can

setting whether

phonograph

engaged) or

record

dbx

a

not

"TAPE PLAY"

when the

(or

pressed

so that the

caused by

encoding

(e.9.,

use

about

you

(preamp

encoded disc

switch engaged and 222 DISC

in).

PLAY

and

as follows: INPUT SELECTOR

on

panel

rear

so that,

on

switches.

switch at

TAPE.

your phonograph.

LEVE L ADJUST

moderately loud

approximately the same when

is alternately

switch

TAPE.

in frequency response

midrange

the dbx encoding

frequencies

caused by

(e.9.,

the

are

All dbx

Consult details.

The dbx

give

questions system, service

applications

products

your

warranty

Customer

additional assistance

regarding interfacing dbx equipment with

will

normal business

Telex:

92-2522,

,

Should it

factory serviced:

1.

problem

the

purchase.

2. Send the

3.

it via United

send

4. Please

Department.

Outside the

name and

for

center.

become

Please repack the

along with the day,

recommend

We

direct all inquiries to dbx Customer Service

address of the nearest authorized

covered by

are

card

Service

information

be

answered.

hours

-

or write to:

your

or

Department is

in

the

information

or

You

Telephone: 617-964-3210

dbx, lnc.

71 Chapel Street Newton, MA

Attn:

unit,

02195

Customer

necessary to have

unit,

freight

Seruice

including a note describing

prepaid,

dbx, Inc.

224 Calvary Street Waltham,

Attn:

U.S.A.-

MA

Repair Department

Parcel

02154

you

that

insure

Service wherever

contact

limited warranty.

a

local dealer for full

of this

may

product.

on

call

use

Department

your

month

and

to:

package

the

possible.

your

nearest dbx

prepared

All

your

special

during

equipment

year

of

and

dealer

repair

to

SPECIFICATIONS

EFFECTIVE NOISE REDUCTION

DYNAMIC RANGE

INPUT IMPEDANCE INPUT LEVEL OUTPUT IMPEDANCE OUTPUT LEVEL

FREOUENCY RESPONSE

SLEW RATE

EOUIVALENT INPUT NOISE TOTAL

HARMONIC DISTORTION

INTERMODULATION DISTORTION

POWER

'

POWER LINE

LINE REOUIREMENT

CONSUMPTION

SIZE

plus

30

dB,

1 10 dB

kohms

100

Nominal, 300 mV RMS; Maximum,

100 ohms

Maximum,

t0.5

material

Greater than 10 V/microsecond,

-85

Less than 0.5%,30 Less than

Less than 0.2%

V

117

W.

5.5

,

17-114"W

(43.8 Rack mount hardware

(peak

(designed

40 Hz

dB,

tracking).

(unweighted,

dBV

O.1%, 1OO

AC,

x

x 4.4

cm

10

headroom;40

dB

signal to

(designed

5.5 V

50 to

1-314"

cm x 18.1 cm)

weighted

to be driven

drive

to

RMS

to 2O

Hz

(SMPTE).

5 kohms or

(5

kohm load).

kHz,

-1

2O kHz bandwidth, referenced to 1 V).

Hz;

100

-

2O kHz

-

60 Hz. Consult factory for non-U.S. line voltages.

Hx7-118" D

supplied to

for dbx-encoded

dB

background

from source

V RMS.

6

greater).

dB

Hz

at 30

(encode/decode).

unit

adapt

discs

noise).

impedance

(encode/decode,

for

standard

(A

weighted).

less

of

than 10 kohms).

typical

(48.3

19"

15

program

cm) rack.

Specifications are subject

to change

without

notice.

16

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Manufaclured und6r

following U.S.

3,7 14,462; 3,789,143; 4,101,849; 4,097,767.

patents pending.

Oth€r

patents:

one or

more

of thg

3,681,618;

71 Chapel Street Newton,

MA

02195

128O 2.2M-600162

Printed

in Japan

R- 783A