Altec Lansing Anniversary Series Schulungshandbuch

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2

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9444B

and

9444B/SA

Anniversary

Series

Power

Amplifier

Operating

and

Service

Instructions

ALTEC

LANSING®

CORPORATION

II

MARK

IV

compuuy

P.

O.

Box

26105

•

Oklahoma

City,

OK

«

73126-0105

USA

®

Tel:

(405)

324-5311

•

FAX;

(405)

324-8981

operating

and

Service

Instructions

for

the

Altec

leLnsing

9444B

Power

Amplifier

Table

of

Contents

1

EU^CTRICAL...

1.1

120

V

ac>

50/00

TTz

Power

Goiiuections

...

-...

.

1.2

220/240

V

ac,

50/60

Hs^

Power

Connectioiis

....

2

INS

TAl.lJ

^TTQN..

.........

-

-

-...

2.1

Eack

Mounting

-........

2.2

V&ntilatioii

.....

3

SIGNAL

CONNECTIONS

....-

--

-

3.1

Input

Conn^tiona......

3.2

Line

Output

Connections

-..

-

*.

.....

3.3

Output

Connections

......

3.4

Output

Cable

Selection.......

3.4.1

CaJeulating

Power

Losses

with

8

ohm

Loads......

3.4.2

Calculating

Power

Losses

with

4

ohm

Loads

.

.

-

.

....

6

3.5

Damping

Factor

...

......................

......

3.5.1

C

alculating

the

Maxunum

Length

of

Gable

for

a

Specified

Damping

Factor

..............

3.6

Speaker

Protection

Fuse

Selection

..-

..

4

3.7

Compression

Driver

Protection

Capacitors

....

4

OCTAL

ACCESSORY

SOCKETS..

.

....-

-

□

5

PROTECTION

SYSTEMS

......

5.1

Load

Prot^tion

Cireuitiy

....

5.2

Amplifier

Protection

Circuitry.....

5.3

Protect

Indicator...

.

.

.

.....

6

OPERATION_______

______

6.1

Dual

Mode

of

Operation.........

6.2

Bridge

Mode

of

Operation

....

7

IN

CASE

OF

PROBLEMS

..........

8

SPECIFICATION.......

..

S

9

SERVICE

INFORMATION........

9.1

Trimpot

Adjustments

.......

^2

9.2

Equipment

Needed.-......

...

12

9.3

Adjusting

R39,

the

LF

Cancel

Trimpot

.....

’!

9.4

Adjusting

R26,

the

BIAS

Trimpot...

.

,

.

.......

i

2

9.5

Adjusting

R23

and

R24,

the

Negative

and

Positive

Current

Limit

Trimpots..

i

9.6

Checking

the

Short

Circuit

Current

...

...

...

i

^

9.7

Ordering

Replacement

Parts

........

1

_

9.8

Factory

Service

.......

9.9

Technical

Assistance

..........

10

THE

9444B/SA

.........

i

ALTEC

LANSING^

CORPORATION

®

a

IV

Company

operating

and

Service

Instructions

for

the

Altec

Lansing

9444B

Power

Amplifier

1

ELECTRICAL

Two

amplifier

models

are

available*

One

model

has

a

50/60

Hz

power

transformer

with

two

120

V

ac

primal^

windings.

These

windings

may

be

wired

in

parallel

or

series

for

operation

at

either

120

V

ac

or

220/240

V

ao_

The

ot*

her

amplifier

model

is

for

export

into

countries

where

the

ac

line

voltage

is

100

volts,

50/60

Hz,

The

next

two

sections

refer

to

the

first

model

with

the

dual

120

V

ac

pri¬

mary

windmgs,

1-1

120

V

ac,

50/60

Hz

Power

Coimectioiie

The

amplifier

is

provided

with

the

primary

of

the

power

tra¬

nsformer

strapped

for

120

V

ac

operation

from

the

factory*

Refer

to

Figure

2a

for

the

wiring

details.

WARNING:

Verify

that

the

power

transformer's

primary

circuit

configuration

is

correct

for

the

intended

ac

line

voltage

BEFORE

applying

power

to

the

amplifier,

1.2

220/240

V

ac,

60/60

Hz

Power

Connections

The

power

transformer

has

two

120

volt

primary

windings

which

can

be

connected

in

parallel

for

120

V

ac

Hne

voltages,

or

in

series

to

meet

220/240

V

ac

requi¬

rements-

Use

the

following

pro¬

cedures

to

re-strap

the

primary

of

the

power

transformer

for

220/240

V

ac

applications*

1*

Make

sure

the

amplifier

is

not

connected

to

any

po¬

wer

source,

2*

Remove

and

save

the

ele¬

ven

screws

securing

the

top

cover.

There

are

three

screws

on

each

side

and

three

along

the

top-rear

edge

of

the

chassis.

In

addition,

you

must

remove

the

two

innermost

screws

inset

into

the

top

bumper

strip.

Refer

to

Figure

1

for

the

exact

screw

locations.

Figure

1

Top

Cover

Removal

3.

Locate

terminal

blocks

TBl

and

TB2

on

the

side

of

the

chassis

near

the

rear

input

PC

board.

Re-

comueet

the

leads

as

shown

in

Figure

2b.

4-

Install

the

lop

cover

with

the

eleven

screws

previ¬

ously

removed.

Two

scr¬

ews

are

longer

than

the

others

removed

from

the

sides

and

rear.

These

longer

screws

install

into

the

rearmost

position

on

eacli

side

of

the

chassis.

5.

Install

an

5A

fuse,

Liiieb

fuse

Type

SAB

5A/2S0V

sio-blo

326-series

ceramic

body

or

equiv.

2

INSTALLATION

2-1

Rack

Mounting

The

amplifier

xniiy

be

in¬

stalled

in

a

stand:

-

!

19

inch

equipment

rack.

It

■

luires

5W

inches

of

vertical

rac>

r^-pace

and

secures

to

the

rack

:

binet

with

the

four

rack

moun^

screws

and

cup

washers

provide-’’:

the

hard¬

ware

kit.

2.2

Ventilation

The

amplifier

must

be

ad¬

equately

ventilatfju

avoid

ex¬

cessive

temperatur

It

should

not

be

used

in

area,

where

the

ambient

tempersTurf

exceeds

60

(140

®F).

To

deteruiine

the

am¬

bient

air

temperat

ure:-,

operate

the

^stem

in

the

rack

u\

U

the

temp¬

erature

stabilize:;.

Measure

the

ambient

air

with

a

uulb-type

ther¬

mometer

held

at

tlie

'jotiom

of

the

uppermost

amplifier.

Do

not

let

the

thermometer

tm

:h

the

metal

chassis

because

the

c:iiasgis

will

be

hotter

than

the

ambient

air.

If

the

ALTEC

LANSING^

CORPORATION

•

a

Mark

IV

Company

1

Operating

and

Service

Instructions

for

the

Mtec

Lansing

9444B

Power

Amplifier

Figure

2

Primary

Wiring

ConfiguratioB

for

120

V

ac

and

220^40

V

ac

air

temperature

exceeds

60

(140

the

equipment

sJhouId

bo

spaced

at

least

1-75

inches

apart

or

a

blower

installed

to

provide

sufficient

air

mov^ent

within

the

cabinet.

WARNING:

Do

not

operiite

the

amplifier

within

a

completely

closed

unventilated

housing,

3

SIGNAL

CONNECT¬

IONS

3,1

Input

CormectloBS

Balanced

input

connect¬

ions

may

be

made

to

either

the

barrier

strip

or

the

female

XLR

connectors.

For

single-ended

in¬

puts,

strap

the

low

(—)

input

to

ground

(pin

3

on

XLR),

Other¬

wise,

the

electronically-balanced

input

stage

wib

see

6

dB

less

in-

put

signal

level

than

with

a

bal¬

anced

input-

Refer

to

Figure

3

for

typical

input

connections.

3*2

Line

Output

Connect¬

ions

The

XLR

and

barrier

strip

connectors

are

wired

in

paraUeL

Pin

2

of

the

XLR

is

the

(+)

input

on

the

barrier

strip,

and

pin

3

is

the

(—)

input.

Since

the

input

im¬

pedance

of

the

electronically-

balanced

input

stage

is

high

(15

kolims),

there

is

min

imal

loading

on

the

signal

source.

When

the

input

connections

are

made

to

one

connector,

the

other

may

be

used

as

an

auxiliaiy

line

output

to

other

high

input

impedance

equip¬

ment,

Refer

to

Figure

3

for

poss¬

ible

applications,

3^3

Output

Connections

Output

connections

are

made

to

the

four

terminal

barrier

strip

connector

located

on

the

rear

of

the

unit.

Refer

to

Figure

4

for

typical

output

connectionE,

3.4

Output

Cable

Selects.

Speaker

wire

si2:e

playrs

a-

important

part

in

quality

sot

systems.

Small

wire

gauges

ci

i

waste

power

and

reduce

the

dar

-

ping

factor

at

the

speaker

ter

i-

inals.

This

can

add

coloration

muddio^s

to

the

sound.

To

ii*-

offset

this

problem.

Table

I

in

been

assembled

to

enable

yov,

calculate

the

power

losses

in

speaker

cable,

3.4,1

Calculating

Powe

Losses

with

8

Loads

To

calculate

the

tot

power

loss

in

the

speaker

caij.

multiply

the

power

loss

per

Cor

meter)

of

the

2-wire

cal

selected

from

Table

I

by

length

of

the

cable

in

feet

meters).

For

example,

suppose

installer

uses

160

feet

of

10

GA

wire

c^le

with

an

8

H

^stem.

The

total

power

loss

the

cable

is:

Total

Power

Loss

in

cable

-

0,0509

watWfoot

x

160

feet

—

8,2

watts

Does

this

mean

that

whenever

amplifier

produces

200

watt-

output

power,

191,9

waits

(2i

watts

minus

8.1

watts)

will

Oi:

delivered

to

the

8

ohm

load?

Tlie

actual

load

impedance

is

ohms

plus

the

resistance

of

•

cable

(0.00204

ohms/foot

160

feet)

for

a

tot^ll

load

imp^

dance

of

8,3264

ohms.

At

the

8

rated

output

power,

the

outpu

voltage

is

40

V

rms.

Therefor

the

amplifier

produces

192,2

wax.;

with

this

load

instead

of

20f

watts.

This

was

calculated

squaring

the

voltage

and

dividi;

,

by

the

load

impedance

{40^

div;

ed

by

8.3264

ohms).

As

a

resuii.

the

actual

power

delivered

to

‘

load

is

184A

watts

(192,2

wa:

minus

8.1

watts).

2

ALTEC

LANSING^

CORPORATION

•

a

Mark

IV

Company

Operating

and

Service

Instructions

for

the

Altec

Lansing

9444B

Power

Amplifier

SOURCE

AMPLIFIER'S

IKPUTS

AUX

OUTPUTS

Figure

S

laical

Input

Cannections

AMPLIFIER'S

OUTPUTS

LOUDSPEAKER

LOADS

Figure

4

Typical

Oatpui

Connections

Had

IS

GA

wire

been

used

in

the

above

example,

the

loss

in

the

cable

would

have

been

51*9

watts*

This

example

illustrate

the

im¬

portance

of

using

the

proper

wire

size.

S.4.2

Calculating

Power

Losses

with

4

ohm

Loads

To

calculait

the

losses

when

using

a

4

ohm

spi^aker

as¬

tern,

multiply

the

at

3

ohms

by

3.

In

the

above

exair.

i

!

-,

the

10

GA

wire

would

com

me

24*3

watts

of

power

while

18

GA

wire

wotild

waste

15v

7

watts

-

more

than

half

of

tke

arrtplifier^s

4

ohm

power

raiin^^

3-5

Damping

Factor

The

higher

tht

diiinping

factor

rating

of

an

ajni

liflerj

the

greater

the

ability

of

ampliiier

to

control

unwanted

s\

-

iiker

cone

movements.

When

a

sigiml

drives

a

woofer,

current

flowii^

through

the

voice

coil

creates

Miagneiic

field.

This

Geld

inter;-.

with

the

permanent

magnetic

in

the

gap

and

forces

the

v'fnbmation

cone

and

voice

coil

ar

^enibiy

to

move

outward.

When

'

signal

is

removed^

the

asseinbl-.

moves

in¬

ward

hut

its

momefitu

ill

causes

it

to

overshoot

its

resting

licunt.

This

overshoot

will

dampen

itself

out

eventually

but

the

uir

nted

mo¬

vements

can

add

consitiex^ble

dis-

tori

ion

products

to

ih-

;’Ound*

In

the

process

of

moving

inward

through

the

magni-'

ic

field,

the

voice

coil

assembh^

aerates

a

current

of

opposite

poinrity

to

the

original

signal.

Tiiiti

current

induces

a

voltage

or

“back

EMF'*

which

travels

through

the

speaker

wire

to

the

ampliiler*s

output*

The

lower

the

ampUni

r

k

output

impedance,

the

faster

the

over¬

shoot

of

the

voice

coll

will

dampen

out.

The

output

impetjanoe

of

an

amplifier

can

be

calc

ulated

by

dividing

the

rated

cputput

impe¬

dance,

typically

S

nhms,

by

the

damping

factor.

The

has

a

damping

factor

rating

of

200

which

correspond:

ll*

an

output

impedance

of

0.04

ohnis,

3.5-1

Calculating

the

Maximo

m

Length

of

Cable

for

n

Specified

ALTEC

LANSING^

COJ?PORAT/OiV

•

a

AfarJt

IV

Company

Operating

and

Service

InBtructions

for

the

Altec

Lansing

9444B

Power

Amplifier

Damping

Factor

Spec¬

ification

at

the

Load

The

damping

factor

rating

is

typically

never

realiml

at

the

load

because

of

the

resistance

of

the

cable

(and

other

factors

such

as

tlie

contact

resistance

of

an

output

relay

or

the

resistance

of

an

output

fuse)-

The

damping

fac¬

tor

at

the

load

should

be

30

for

general

paging

systems

and

50

for

high

fidelity

music

systems.

Econ¬

omics

usually

dictate,

however,

that

these

numbers

are

cut-in-

half,

The

resulting

damping

factor

at

the

load

should

be

based

on

experience

and

customer

satis¬

faction,

Once

a

minimum

damping

factor

is

determined

for

a

partic¬

ular

type

of

installation,

the

fo-

ilowing

equation

can

calculate

the

maximum

length

of

2-wire

cable

which

can

be

used

to

achieve

the

minimitm

damping

factor

specified

at

the

load:

Max.

Length

of

2-wire

cable

in

feet

ZL

—

Zo

-

JDF_

DCK/ft

where

ZL

is

the

load

impedance

to

connect

to

the

amp¬

lifier;

Zo

is

the

amplifier's

output

impedance

(0,04

ohms

for

the

9444B);

DF

is

the

minimum

permissible

damping

factor

at

the

load;

aiwl

DCR/ft

is

the

DC

resis¬

tance

of

the

2-wb:e

cable

per

foot

from

Table

L

The

same

equation

can

be

used

to

calculate

the

maximum

cable

leng¬

th

in

meters

by

substituting

the

DCR

per

meter

value

from

Table

L

Let's

use

the

equation.

Suppose

ZL

equals

8

ohms,

Zo

=

0,04

ohms,

and

the

minimum

damping

Table

I

9444B

Power

Losses

in

2-wire

Speaker

Cable

Power

Cable

Crni$a-

Power

AWO

DCB/n.

Losa/n

Soclioinil

DCR/Jiieter

LDSs/rR.CtilJ

(GA)

(O/a)

(watWft)

Biva

(mm^)

(n/m)

0.00081

0.0201

13.30

0.00264

0.0661

8

0.00X21

omm

S.3ti

0.00421

0-1051

10

0.00204

0.0509

5.26

0.00669

0.1669

12

0.00324

0,0809

3.S1

001003

0.2650

14

0.00515

0.1280

3.08

0.01691

0-4210

16

0.00819

0.2043

1.31

0.02685

0.0067

18

0.01302

0.3244

0.82

0.042S9

1.0609

20

0.02070

0.5148

0.52

0.06764

1.0627

22

0.03292

0,8163

0.33

0

10658

2.5950

factor

at

the

load

is

25,

in

add¬

ition,

18

GA

cable

is

preferred.

Then,

the

maximum

length

of

18

GA

cable

which

can

be

used

to

achieve

a

damping

factor

of

25

at

the

load

is;

8

—

(G,04>

^5_

=

2L5feet

0.01302

n/ft

Sometimes

it

may

be

oec^sary

to

locate

the

speaker

100

feet

or

more

away

fiom

the

amplifier-

In

this

situation,

a

much

larger

gauge

cable

is

required.

However,

this

may

not

be

practical

or

eco¬

nomical.

The

size

of

the

2-wire

cable

can

be

greatly

reduced

by

stepping

up

the

output

voltage

of

the

amplifier

to

70,

100,

140,

or

210

volt,

uaing

an

output

trans¬

former,

then

stepping

down

the

voltage

at

the

load.

Such

a

system

is

shown

in

Figure

5,

The

maximum

length

of

2-wire

ca¬

ble

in

this

situation

can

be

ap¬

proximated

from

the

following

equation:

Max.

Length

of

2-wire

cable

in

feet

1

Zq

(Pout)(DCR/ft)

DP

ZL

where

V

is

the

stepped-up

age

of

the

fystem;

Pout

is

the

mted

outpi

*

power

of

the

amplifier:

Zo

is

the

output

imp

ance

of

the

amplifier

(O.C

ohms

for

the

ZL

is

the

load

impeda

-

IKJR/ft

is

the

DC

tance

of

the

2-wire

cal:

per

foot

from

Table

I;

DF

is

the

minimum

p

missible

damping

facto:

the

load.

Suppose

a

210

volt

system

iver

used

at

a

600

watt

power

level

drive

an

8

ohm

load

with

a

mi

i

mum

damping

factor

of

25,

Usin^

the

same

18

GA

cable

as

befo^

the

maximum

Length

can

now

198

feet.

Power

companies

Wr.

this

technique

to

transfer

larga

amounts

of

power

over

great

di

^

tances.

3.6

Speaker

Protectioj

Fuse

Selection

Sometimes

it

may

be

des¬

irable

to

use

in-line

fuses

(fuses

ir

series

with

the

output)

to

protect

loudspeaker

^sterns

(or

the

am;

lifier).

It

is

difficult,

however,

determine

the

proper

fuse

value

with

the

correct

time

lag

au:.

overload

characteristics

to

match

the

limitations

of

a

speaker

sys-

tern.

The

values

shown

in

Table

!!

should

serve

only

as

a

guide,

T:

4

ALTEC

LANSING*

CORPORATION

•

a

Mark

IV

Company

Operating

and

Service

Instructions

for

the

Altec

Lansing

9444B

Power

Amplifier

Figure

5

High-voltage

Distrihution

System

use,

determine

iJie

power

rating

and

load

value.

Then,

^lect

a

standard

value

fuse

of

the

next

smaller

value

to

the

one

listed

in

the

table.

Table

n

Calculated

Output

Fuse

VEdues

Power

da

sn

jsa

(wtttta)

Load

Lead

100

5.70

2.62

1.85

150

4.54

5.2i

2.27

200

5.24

3.70

a.G2

300

6.42

4.34

3.21

400

7.41

5.24

3-70

600

9.07

6.42

4.54

The

values

are

calculated

for

fast-

blow

fuses

which

carry

135%

of

their

current

rating

for

an

hour

but

will

blow

within

1

second

at

200%,

Other

fuse

values

may

be

calculated

for

different

power

levels

from

the

following

equation:

Fuse

value

=

(Pout

X

ZL)

^

amps

ZL

X

1.35

where

Pout

is

the

output

power

rating

of

the

amplifier;

and

ZL

is

the

load

impedance.

Use

32

volt

fuses

if

possible;

they

typically

have

the

lowest

internal

resistance

which

will

help

mini¬

mize

deterioration

of

the

doping

factor

at

the

load.

Refer

to

the

example

in

Figure

4,

3.7

Compression

Driver

Protection

Capacitors

Compression

drivers^

used

for

mid

to

high

frequency

sound

reproduction,

are

much

more

sus¬

ceptible

to

damage

from

low

fre¬

quencies

than

large

cone

loud¬

speakers.

Even

though

an

elect¬

ronic

crossover

may

be

employed,

problems

may

arise

in

the

cables

between

the

crossover

and

the

power

amplifier,

or

from

misad-

jnstment

of

the

crossover.

Either

of

these

situations

could

apply

low

frequency

signals

or

hum

to

the

driver

and

cause

damage.

To

pre¬

vent

a

potential

mishap,

Altec

Lansing

recommends

using

a

cap¬

acitor

between

the

amplifier

and

the

compression

driver

lo

supp¬

ress

low

frequencies

and

^

Gssible

DC,

Refer

to

the

eKamp;

■

in

Fig¬

ure

4.

In

choosing

a

value,

must

be

careful

not

to

interfer

with

the

crossover

frequency.

A*

a

jcneraZ

rule,

sefeef

a

capac^:c^

whose

break

frequency,

with

r^pect

to

the

load,

is

3

dB

down

at

appnxdmuie-

iy

Vs

of

the

high

omer

/ne-

quency.

Mylar

capacitors

witli

least

a

100

volt

ac

rating

are

ra:

-umend-

ed.

Table

lU

shows

recom¬

mended

capacitor

val.

-

for

use

with

8

and

16

ohm

dri’

^rs

at

pop¬

ular

crossover

frequencies.

Table

HI

Driver

Protection

Capacitors

Crossov,!-

sa

ten

Fmiueniv

Drivor

Drivner

SOO

Hz

m

pT

40

(iF

800

Hz

50

pr

25

|iF

1000

Hz

40

jtF

20

t.F

1250

Hz

33

iiF

i6jiF

2000

Hz

20

pjT

10

i*F

3150

Hz

12

jlF

6m.F

6300

Hz

6

jii

3

|iF

4

OCTAL

ACCESSORY

SOCKETf

Two

octal

sockets

permit

a

variety

of

plug-in

acppr

jori^

to

be

used

with

the

amplifier

Normally,

one

"U”

jumper

Is

^

-inerted

bet¬

ween

octal

socket

pins

8

and

1,

and

another

betwixt:

*

i

ns

7

and

6.

These

jumpers

must

remain

in

plctee

for

the

amplii

rr

to

operate

when

not

using

accessory

modules.

To

use

with

in

accessory

module,

remove

r

.

save)

the

jumpers

and

insb.r

:he

module

making

sure

the

kev

o

its

center

post

aligns

with

tlis

roove

m

the

female

socket.

For

r

^ration,

refer

to

the

instructions

Tovided

with

ALTEC

LANSING^

CORPOitAT/OAT

o

a

Mark

IV

Company

5

Operating

and

Service

Instructions

for

the

Altec

Lansing

9444B

Power

Amplifier

the

module.

Schematically,

the

module

will

bo

inserted

between

the

input

connector

and

the

bal-

anced

input

stage.

Electronic

modules

are

powered

from

a

bipolar

15

vplt

supply

in

the

amplifier,

'Hie

supply

is

cap¬

able

of

supplying

up

to

25

ma

DC

of

current.

Currents

in

excess

of

25

ma

DC

may

prevent

the

ampli-

Ger

from

diseng^ing

from

its

built-in

protection

meciianisms.

5

PROTECTTON

SYS¬

TEMS

5.1

Load

Protection

Cir¬

cuitry

Each

channel

independ¬

ently

protects

its

Ic^d

from

startup/shutdown

transients,

DC,

and

large

subsonic

signals.

5.2

Amplifier

Protection

Circuitry

A

unique

current-limiting

circuit

was

designed

specifically

for

the

amplifier.

It

features

a

variable

ciirrenl

limit

which

is

a

function

of

the

output

signal

volt¬

age,

As

a

result,

tlie

amplifier

can

deliver

the

rated

currents

into

rated

loads

but

substantially

lim¬

its

the

current

into

low

impedance

or

shorted

loads

(diorted

output

terminals).

Once

the

short

is

re¬

moved,

however,

the

amplifier

will

resume

normal

operation.

A

dual

speed

fan

is

also

incorp¬

orated

to

provide

efficient

cooling

under

the

most

demanding

condi¬

tions.

When

the

heatsink

temper¬

ature

at

the

fin

tips

reaches

ap¬

proximately

88

^

(190

TP')>

the

fan

automatically

switch^

to

high

speed

operation.

As

the

temper¬

ature

cools

to

approximately

78

®C

(172

"F),

low

speed

operation

is

once

again

reamed.

The

heatsink

is

also

thermally

equalized

to

prevent

the

output

devices

nearest

the

fan

from

op¬

erating

at

a

cooler

temperature

than

the

devices

at

the

opposite

end.

Tills

minimizes

the

thermal

gradient

across

the

heatsink

and

forces

the

devices

to

operate

at

more

nearly

the

same

tempera¬

ture,

Tills

equalizes

the

lifetimes

and

reliability

characteristics

of

the

output

devices

so

that

no

one

device

becomes

the

weak

link

in

the

chain.

Should

the

hmtsiiik

temperature

of

a

channel

remain

excessively

high,

the

affected

channel

will

shut

down

automatically.

When

the

output

devices

cool

to

a

safe

operating

temperature,

the

chan¬

nel

will

automatically

resume

normal

operation-

5.3

P

rotect

Indicator

The

‘TROTECT”

LED

does

not

tiirn*on

abruptly

as

others

may

do;

its

intensity

is

allowed

to

vary.

As

a

result,

its

degree

of

brightness

serves

as

a

relative

indicator

of

the

severity

of

the

current

operating

conditions

e.g.,

the

bri^ter

the

LED,

the

greater

the

stress

on

the

chan-

nel(sj.

This

provides

a

visual

not¬

ification

well

in

advance

of

any

impending

shutdown.

Although

the

channel

may

still

operate

with

the

LED

apparently

at

full

brightness,

a

total

shut¬

down

will

occur

within

a

few

sec¬

onds

unle^

the

operating

condit¬

ions

improve.

If

a

shutdown

does

occur,

the

channel

will

resume

normal

operation

as

soon

as

its

devices

have

cooled

to

an

accept¬

able

temperature.

0

OPERATION

6.1

Dual

Mode

of

Oper¬

ation

In

the

dual

mode

of

oper¬

ation,

the

channels

may

be

oper¬

ated

independently.

After

install-

ation

and

hookup,

verify

that

the

mode

switch,

located

on

the

rear

panel,

is

in

the

**DUAL”

position

and

rotate

the

level

controls

fully

counterclockwise

(full

attom.

ion).

Input

a

0

dBo

(0-775

V

nominal

signal

level

and

power.

Slowly

increase

the

controls

until

the

desired

oui

power

is

obtained.

If

ci

^^CLIP”

LED

illuminates,

red

the

output

with

the

channel

lev

control

or

reduce

the

input

eigi

level

at

its

source.

WARNING:

Never

attempt

o

nect

the

outputs

of

the

two

cka

nels

in

parallel.

6,2

Bridge

Mode

of

Op-

ation

After

installatian

hookup,

verify

that

the

mt

switch,

located

on

the

rear

pan?

is

in

the

“BRIDGE’’

position,

h

ate

both

levels

controls

fi

.

counterclockwise

(full

atteiin;:

ion).

Input

a

0

dBu

(0.775

V

r:

noniinal

signal

level

into

chan:^

1

only

and

apply

power.

Slowly

crease

the

level

control

of

char

.

1

until

the

desired

output

povv

is

obtained-

If

either

“CLIP”

LK

illuminates,

reduce

the

output

le

el

with

the

level

control

or

redur

the

input

signal

level

at

its

sou:

CAUTION:

Be

sure

that

no

inp'

connectioTis

are

made

to

ehannc:

and

that

its

level

control

is

fut

counterclockwise

(OFF).

WARNING:

The

bridged

outp:

mode

provides

a

true

balanced-tf

ground

output

Do

not

use

any

tei

equipment

to

test

or

evaluate

tk^

amplifier

which

does

not

ha’

floating

grounds.

7

In

Cajse

of

Problems

Please

check

the

foUowii..

items:

1.

Verify

that

the

amplifier

is

properly

connected

an

ac

power

source

an^

that

the

source

is

active.

2,

Verify

that

the

input

con¬

nections

are

proper.;

6

ALTEC

LANSIN<?^

CORPORATION

•

a

Mark

IV

Company

Operating

and

Service

Instructions

for

the

Altec

Innsing

9444B

Power

Amplifier

made.

Refer

to

Figure

3.

3.

Verify

that

the

output

connections

are

properly

made.

Refer

to

Figure

4.

4.

Check

the

input

and

out¬

put

cables

for

proper

wiring

and

continuity,

5.

Check

the

signal

source

and

the

load.

6.

Insure

that

the

two

jump¬

ers

for

each

octal

socket

are

properly

installed

(if

not

using

optional

plug-in

modules)-

7.

Insure

that

any

accessory

modnles

installed

do

not

draw

more

than

25

ma

DC

of

current,

8.

Check

that

the

mode

switch

is

in

the

desired

position,

NOTICE:

Repairs

perfoT-med

by

other

than

authorized^

worranty

stations

(Declers)

or

qudlified

persofiTtel

shall

void

the

w<xrrajity

period

of

this

unit

To

avoid

loss

of

warranty^

see

your

nearest

Alt^

Lansing

authorized

dealer^

or

call

Altec

Lansing

Customer

Service

directly

at

(405)

324^5311^

FAX

(405)

324-8981,

or

uirite:

Altec

Lansing

Customer

Service/Repair

10500

W,

Reno

Oklahoma

City,

OK

73128

U,ISA,

ALTEC

LANSING^

CORPORATION

«

a

Mark

IV

Company

7

operating

and

Service

Instructions

for

the

Altec

Uinsing

9444B

Power

Amplifier

8

SPECIFICATIONS

Bridge

mode,

8

or

16

Q;

39

dB

Conditions:

1.

0

dBu

-

0<775

volts

rms.

2.

Dual

mode

ratings

are

for

each

charmeL

3.

Both

channels

operating

at

rated

output

power

unless

noted.

4.

120

volt

ac

line

input

voltage

maintained

for

all

tests

unless

noted.

Continuous;

Elated

Output

Power:

(20

Hz

-

20

kHz

at

less

than

0-1%

THD)

Dual

mode,

4

fl:

300

watts/ch

Bridge

mode,

8

A:

600

watts

Dual

mode,

8

A:

200

watts/ch

Bridge

mode,

16

A:

400

watts

Input

Sensitivity

for

Rat«d

Output

Power;

(Ret

1

kHz,

±0.15

dB)

Dual

mode,

4

A:

±0.1

dBu

(0.78

V

nn

>

Bridge

mode,

8

A:

+0.1

dBu

(0.78

V

rm:v

Dual

mode,

8

A:

+1.2

dBu

(0.89

V

rm."

Bridge

mode,

16

A:

+1.2

dBu

(0.89

V

rm

Maximum

Input

Level:

+20

dBu

(7.75

V

rme

(Ref,

1

kHz)

input

Impedance:

(Ref.

1

kHz)

Balanced;

15

kA

Unbalanced:

15

kA

Continuous

Rated

Output

Power

to

Subwoofer:

(20

Hz

-

1

kHz

at

less

than

0.1%

THD)

Dual

mode,

4

A:

375

watts/ch

Bridge

mode,

8

A:

750

watts

Dual

mode,

8

A:

225

watts/ch

Bridge

mode,

16

A;

450

watts

Polarity:

Positive-going

sign

applied

to

pin

2

of

or

{+)

of

barrier

st.

produces

positive-gf

signal

at

(+)

oirt-p

terminal.

Maximum

Midband

Output

Power:

(Ref.

1

kHz,

1%

THD,

@120

volts

ac

line

volUge)

Dual

mode,

4

A:

>400

watts/ch

Bridge

mode,

8

A:

>800

watts

Dual

mode,

8

A:

>250

watts/ch

Bridge

mode,

16

A:

>

500

watts

(Ref.

1

kHz,

1%

THD,

@108

volts

ac

(10%

sag))

Dual

mode,

4

A:

>325

watts/ch

Bridge

mode,

S

A:

>650

watts

Dual

mode,

8

A:

>200

watts/ch

Bridge

mode,

16

A;

>400

waits

(Ref

1

kHz,

1%

THD,

@100

volts

ac

(17%

sag))

Dual

mode,

4

A:

>230

watts/ch

Bridge

mode,

8

A:

>460

watts

Dual

mode,

8

A:

>

176

watts/ch

Bridge

mode,

16

A;

>350

watts

Headroom

(Before

clip):

^

1

dB

(Ref.

1

kHz,

1%

THD,

any

mode)

Frequency

Response;

10

Hz

-

90

kHz

(Ref.

1

kHz,

1

watt

output,

+0/—3

dB)

Power

Bandwidth:

20

Hz

-

20

kHz

(Ref

1

kHz,

+0/—1

dBr

where

0

dBr

=

rated

output

power

in

any

mode)

Voltage

Gain:

(Ref.

1

kHz)

Dual

mode,

4

A

or

8

0;

33

dB

<+

2

5

^

>-^

15

"

<

0

.

1

%

{Typ.

<

0

.

01

%

measurement

bandwidth)

Phase

Response:

(Any

mode)

20

Hz:

20

kHz:

THD:

(Any

mode,

30

kHz

IMD

(SMPTE

4:1):

(Any

mode)

TIM

(DIM

100):

(Any

mode)

Rise

Time:

(Any

mode,

10%

to

90%)

Slew

Rate:

Dual

mode,

4

or

8

A:

Bridge

mode,

8

or

16

A:

Damping

Factor;

(Dual

mode,

8

A)

20

Hz

-

1

kHz:

20

kHz:

<0.05%

(l^p.

<0S)m

<0.05%

<6

psec

>30

V/psac

>60

V/psec

>200

>76

Crosstalki

<76

dBr

(Ref

1

kHz,

0

dBr

—

rated

output

power

into

8

ohms,

single

channel

operating)

Noise:

>100

dB

(Below

rated

output

power,

A-weighting

filter,

S

8

ALTEC

LANSING^

CORPORATION

«

a

Mark

IV

Company