Rotel RB-956AX User manual

Table of contents

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RB-956AX

SIX

CHANNEL

POWER

AMPLIFIER

OWNER'S

MANUAL

WARNING:

TO

PREVENT

FIRE

OR

SHOCK

HAZARD,

DO

NOT

EXPOSE

THIS

APPLIANCE

TO

RAIN

OR

MOISTURE.

Write

your

SERIAL

NUMBER

here

The

number

is

located

near

the

identification

plate

on

the

rear

panel

SAFETY

INSTRUCTIONS

_

Please

read

this

section

carefully

before

you

begin,

in

order

to

ensure

the

best

safe-guarding

both

of

yourself

and

that

of

your

equipment

at

all

times:

1.

Read

Instructions

-

All

the

safety

and

operating

instructions

should

be

raid

before

the

appliance

is

operated

2.

Retain

Instructions

-

The

safety

and

operating

instructions

should

be

retained

for

future

reference

3.

Meed

Warnings

-

All

warnings

on

the

appliance

and

in

the

operating

instructions

should

be

adhered

to

4.

Follow

Instructions

-

All

operating

and

use

instructions

should

be

followed.

5.

Water

and

Moisture

-

The

appliance

should

not

be

used

near

water

-

for

example,

near

a

bathtub,

washbowl,

kitchen

sink,

laundry

tub,

in

a

wet

basement

or

near

a

swimming

pool,

etc.

6.

Carts

and

Stands

-

The

appliance

should

be

used

only

with

a

carl

or

stand

that

is

recommended

by

the

manufacturer

6A.An

appliance

and

cart

combination

should

be

moved

with

care.

Quick

stops,

excessive

force

and

uneven

surfaces

may

cause

the

appliance

and

carl

combination

to

overturn.

7.

Wall

or

Ceiling

Mounting

-

The

appliance

should

be

mounted

to

a

wall

or

ceiling

only

as

recommended

bv

the

manufacturer.

8.

Ventilation

-

The

appliance

should

be

situated

so

that

its

location

or

position

docs

not

interfere

with

its

proper

ventilation.

For

example,

the

appliance

should

not

be

situated

on

a

bed.

sofa,

rug,

or

similar

surface

that

may

block

the

ventilation

openings;

or

placed

in

a

built-in

installation,

such

as

a

bookcase

or

cabinet

that

may

that

may

impede

the

flow

of

air

through

the

ventilation

openings.

9.

Heat

-

The

appliance

should

be

situated

away

from

heat

sources

such

as

radiators,

heat

registers,

stoves

or

other

appliances

(including

amplifiers)

that

produce

heat.

10.

Power

Sources

-

The

appliance

should

be

connected

to

a

power

supply

only

of

the

type

described

in

the

operating

instructions

or

as

marked

on

the

appliance.

11.

Grounding

or

Polarization

-

The

precautions

that

should

be

taken

so

that

the

grounding

or

polarization

means

of

an

appliance

is

not

defeated.

12.

Power-Cord

Protection

-

Power

supply

cords

should

be

routed

so

that

they

are

not

likely

to

be

walked

on

or

pinched

by

items

placed

upon

or

against

them,

paying

particular

attention

to

cords

and

plugs,

convenience

receptacles

and

the

point

where

they

exit

from

the

appliance.

13.

Cleaning

-

The

appliance

should

be

cleaned

only

as

recommended

by

the

manufacturer.

14.

Power

Lines

-

An

outdoor

antenna

should

be

located

away

from

the

power

lines

15.

Nonuse

Periods

-

The

power

cord

of

the

appliance

should

be

unplugged

from

the

outlet

w

hen

left

unused

for

a

long

period

of

lime.

16.

Object

and

Liquid

Entry

-

Care

should

be

taken

so

that

objects

do

not

fall

and

liquids

arc

not

spilled

into

the

enclosure

through

the

openings.

17.

Damage

Requiring

Serv

ice

-

The

appliance

should

be

serviced

by

qualified

factory-authorized

sen

ice

personnel

w

hen

•

The

power-supply

cord

or

the

plug

has

been

damaged;

or

•

Objects

have

fallen,

or

liquid

has

been

spilled

into

the

appliance;

or

•

The

appliance

has

been

exposed

to

rain,

or

•

The

appliance

docs

not

appear

to

operate

normally

or

exhibits

a

marked

change

in

performance;

or

•

The

appliance

has

been

dropped,

or

the

enclosure

damaged.

18.

Serv

icing

-

The

user

should

not

attempt

to

service

the

appliance

beyond

that

described

in

the

operating

instructions.

All

other

servicing

should

be

referred

to

qualified

factory-authorized

service

personnel.

Explanation

of

Graphical

Symbols

The

lightning

flash

with

arrowhead

symbol,

within

an

equilateral

triangle,

is

intended

to

alert

the

user

to

the

presence

of

uninsulated

'dangerous

voltage'

within

the

product's

enclosure

that

may

be

of

sufficient

magnitude

to

constitute

a

risk

of

electric

shocr.

to

persons.

The

exclamation

point

within

an

equilateral

triangle

is

intended

to

alert

the

user

to

the

presence

of

important

operating

and

maintenance

instructions

in

the

literature

accompanying

the

appliance.

WARNING:

To

reduce

the

risk

of

fire

or

electric

shock,

do

not

expose

this

appliance

to

rain

or

moisture.

Do

not

remove

the

panels

There

arc

no

user-serviceable

parts

inside

Refer

servicing

to

qualified

service

personnel.

RISK

OF

ELECTRIC

SHOCK

DO

NOT

OPEN

CAUTION:

TO

REDUCE

THE

RISK

OF

ELECTRIC

SHOCK,

DO

NOT

REMOVE

COVER

(OR

BACK).

NO

USER-SERVICEABLE

PARTS

INSIDE.

REFER

SERVICING

TO

QUALIFIED

SERVICE

PERSONNEL.

INTRODUCTION

A

WORD

FROM

ROTEL

Rotel

wishes

to

take

this

opportunity

to

thank

you

for

choosing

our

product.

Our

commitment

and

dedication

to

the

design

and

manufacturing

of

high

fidelity

products

for

more

than

thirty

years

have

guided

the

creation

of

equipment

with

the

highest

level

in

sound

reproduction.

We

are

confident

that

you

will

enjoy

your

Rotel

equipment,

now

and

for

many

years

to

come.

Please

read

this

instruction

manual

carefully

before

you

start

using

your

amplifier

and

keep

it

in

a

safe

place

for

future

reference.

Thank

you

UNPACKING

AND

INSTALLING

UNPACKING

AND

LOCATION

•

Carefully

unpack

your

power

amplifier

and

place

it

gently

at

its

intended

location.

Please

keep

the

packaging

material

for

future

use

in

case

you

move

or

need

to

return

the

unit

for

service.

•

Place

the

amplifier

on

a

flat,

firm

surface

where

it

will

be

free

from

direct

sunlight,

excessive

humidity,

vibrations,

dust,

heat

or

cold.

•

Do

not

place

audio

or

video

cassettes

on

top

of

the

amplifier

because

their

content

may

be

erased

due

to

the

magnetic

fields

created

by

the

transformer

located

in

the

amplifier.

•

Ensure

the

amplifier

has

sufficient

ventilation.

Do

not

block

the

ventilation

openings

at

the

top

and

bottom

of

the

unit,

to

avoid

damage

from

overheating.

ELECTRICAL

REQUIREMENTS

Your

equipment

has

been

designed

to

be

powered

by

your

local

AC

(mains)

supply.

Before

connecting

it

to

the

AC

outlet,

check

the

rating

of

your

unit

on

the

identification

plate

found

on

the

rear

panel.

Never

plug

the

unit

into

an

outlet

of

voltage

different

to

that

specified.

The

wrong

voltage

can

cause

a

serious

fire

hazard.

Consult

your

dealer

if

in

doubt.

THE

CABINET

There

are

no

user-serviceable

parts

inside

the

unit.

Do

not

attempt

to

open

the

cabinet,

as

this

could

damage

your

unit

and

void

your

warranty.

If

the

amplifier

is

dropped,

damaged

or

does

not

seem

to

function

properly,

disconnect

the

power

cord

immediately

and

consult

your

dealer.

CLEANING

YOUR

UNIT

If

your

unit

becomes

dirty,

wipe

it

gently

with

a

soft,

clean,

dry

cloth.

Never

use

solvents

of

any

kind.

HUM

AND

NOISE

In

any

high

fidelity

installation,

hum

may

be

caused

by

the

interconnection

of

a

turntable,

tuner,

amplifier

and

speakers,

as

a

result

of

wiring,

different

grounding

or

locations

of

the

components.

If

hum

or

noise

is

experienced

with

your

unit

try

one

or

a

combination

of

the

following

measures:

•

Check

that

all

cable

connections

have

been

well

and

securely

made,

and

that

they

do

not

run

too

close

to

a

strong

AC

field.

•

Disconnect

all

components

from

the

preamplifier,

except

the

power

amplifier.

Then

reconnect

the

turntable

and

if

hum

or

howling

appears,

move

the

turntable

further

away

from

the

speakers.

•

Use

an

improved

outdoor

antenna

on

your

tuner,

or

move

the

equipment

away

from

objects

such

as

fluorescent

lamps,

rheostats

and

house

appliances

that

use

motors

or

thermostats,

when

receiving

broadcasts.

•

Connect

a

wire

from

the

ground

terminal

on

the

rear

panel

of

this

unit,

to

the

ground

terminal

on

the

applicable

source

unit

(or

any

other

point

on

the

cabinet

where

noise

can

be

brought

down

to

a

minimum).

However,

absolutely

ensure

the

wire

does

not

touch

any

areas

related

to

the

power

source

such

as

auxiliary

AC

outlets,

and

do

not

insert

the

wire

inside

the

cabinet.

•

Contact

your

dealer

for

further

advice.

1

STEREO

AND

BRIDGED

MONO

OPERATION

The

power

amplifier

can

be

used

either

as

a

normal

6-channel

stereo

amplifier

or

as

a

multi-channel

bridged

amplifier.

The

unit

comes

factory-set

as

a

stereo

amplifier

(the

BRIDGED

switches

on

the

back

of

the

unit

are

set

at

the

STEREO

position).

Do

not

tamper

with

the

switch,

unless

you

wish

to

use

the

unit

as

a

mono

amplifier,

in

which

case

reset

the

switch

to

the

BRIDGED

position.

Do

not

connect

the

speakers

before

the

switch

position

is

set

correctly

according

to

your

choice.

The

amplifier

may

be

bridged

to

become

a

5,

4,

or

3

channel

amplifier.

All

settings

and

wiring

should

be

done

prior

to

turning

on

the

amplifier.

MAKING

THE

CONNECTIONS

_

See

Illustration

1

-

Rear

Panel,

to

visualize

where

the

connections

to

components

are

to

be

made.

NOTE:

•

Please

ensure

the

power

is

turned

off

and

that

the

power

cords

from

the

equipment

have

been

unplugged

from

the

AC

(mains)

outlet

before

making

any

connections.

•

The

RB-956AX

has

3

sets

of

level

controls

on

the

front

panel

and

3

bridged

mode

switches

on

the

rear

panel.

These

3

sets:

AMPLIFIER

A,

B

and

C,

all

perform

the

same

functions

and

therefore

only

one

set

of

connections

will

be

explained

in

this

section.

1.

CONNECTING

THE

SPEAKERS:

•

The

illustration

shows

what

audio

components

you

can

connect

to

the

rear

panel

of

the

unit

and

how

they

should

be

properly

hooked

up

via

RCA

type

pin

cords.

Ensure

that

the

Left

and

Right

channels

are

correctly

matched

between

the

RCA

type

sockets

of

the

unit

and

those

on

the

components.

•

Use

speakers

of

impedance

ratings

of

4

to

16

ohms.

However

if

you

wish

to

operate

the

unit

in

bridged

mode

as

a

mono

power

amplifier

with

only

one

speaker,

ensure

the

speaker

is

rated

8

ohms

minimum.

The

speaker

impedance

will

be

indicated

on

the

back

of

the

speakers

or

in

the

speaker's

instruction

manual.

•

Use

proper

speaker

cords

-

which

your

dealer

will

normally

recommend

-

with

as

low

capacitance

content

as

possible.

The

speaker

connections

(five-way

binding

posts)

provided

on

the

back

of

the

amplifier

are

suitable

for

banana

plugs,

as

well

as

bare

wire

or

spade

lugs.

•

If

connecting

the

speaker

cords

directly

with

bare

wire

ends,

we

suggest

you

strip

off

about

1

cm

of

the

insulation

shield

cover

from

the

ends

of

the

speaker

cords.

Twist

any

exposed

strands

tightly,

and

insert

the

ends

fully

and

securely

into

the

terminals

on

the

rear

panel.

•

Check

that

the

speaker

cord

ends

(exposed

tips)

on

the

terminal

posts,

have

no

stray

wires

touching

one

another,

as

this

can

cause

short

circuits

and

may

damage

both

the

amplifier

and

the

speakers.

•

When

using

the

unit

as

a

STEREO

power

amplifier:

make

sure

the

BRIDGED

switch

is

set

correctly

to

the

STEREO

position.

Connect

the

Left

and

Right

channels

correctly

between

the

speaker

and

the

unit,

and

ensure

for

each

channel

that

the

"+"

and

terminals

are

also

correctly

matched.

•

When

using

the

unit

as

a

BRIDGED

power

amplifier

(bridged

mode):

make

sure

the

BRIDGED

switch

is

set

correctly

to

the

BRIDGED

position.

Connect

only

one

speaker

to

the

power

amplifier:

connect

the

"+"

speaker

lead

wire

to

the

LEFT

"+"

terminal

post

on

the

power

amplifier

and

the

speaker

lead

wire

to

the

RIGHT

"+”

terminal

post.

Do

not

operate

the

amplifier

with

a

common

ground

speaker

switching

device.

This

will

damage

the

amplifier

(and

void

your

warranty).

Consult

your

dealer

if

in

doubt.

2.

CONNECTING

THE

PREAMPLIFIER

See

Illustrations

2,

3

and

4

-

when

using

the

unit

as

a

stereo

power

amplifier,

a

bridged

amplirier

or

as

a

stereo

amplifier

for

bi-amplification,

respectively.

•

The

stereo

mode

uses

one

preamplifier

and

one

power

amplifier.

•

The

bridged

mode

(5,

4

or

3

channel

operation)

uses

one

preamplifier

and

bridged

power

amplifiers.

•

The

bi-amping

mode

uses

one

amplifier,

which

has

two

sets

of

outputs

connected

in

parallel,

and

two

stereo

power

amplifiers,

one

driving

the

tweeters

and

the

other

driving

the

woofers

of

the

speakers,

which

have

separate

connectors

for

the

tweeters

and

the

woofers.

•

Ensure

that

regardless

of

the

mode

you

choose,

that

the

correct

connections

are

done.

2

ILLUSTRATION

1

-

REAR

PANEL

ILLUSTRATION

3-WHEN

USING

THE

UNIT

AS

A

BRIDGED

AMPLIFIER

3.

CONNECTING

THE

POWER

CORD

•

Always

handle

the

power

cord

with

care

and

never

pull

the

plug

out

of

the

wall

socket

by

tugging

the

cord.

Hold

the

plug

to

remove

it

from

the

wall.

•

Ensure

the

VOLUME

control

is

set

to

the

minimum

position

before

plugging

in

the

power

cord.

•

Connect

the

power

cord

to

the

AC

(mains)

outlet.

•

When

plugging

and

unplugging

make

sure

the

power

switch

on

the

unit

is

turned

off.

NOTES:

•

Verify

that

all

connections

are

properly

and

securely

made

and

that

the

amplifier

and

components

have

been

plugged

in.

Using

higher

quality

interconnect

cables

will

improve

sound

quality.

LOCATION

AND

OPERATION

OF

CONTROLS

AND

INDICATORS

_

See

Illustrations

1

and

5

-

Rear

and

Front

Panels,

to

visualize

the

location

of

the

switches

and

controls.

NOTE:

Ensure

the

volume

control

is

set

to

the

minimum

position

before

turning

the

power

on.

1.

POWER

BUTTON/INDICATOR

Switches

the

power

on

and

off

once

power

is

supplied

to

the

unit.

2.

CHANNEL

INDICATORS

The

CHANNEL

indicators

light

up

red

to

show

which

channels

are

in

use.

3.

BRIDGED

MODE

INDICATOR

The

BRIDGED

mode

indicators

light

up

amber

to

show

that

the

BRIDGED

switch

on

the

rear

panel

is

set

to

the

BRIDGED

position.

4

LEVEL

CONTROLS

There

is

a

LEVEL

control

for

each

amplifier

set,

which

are

useful

for

custom

installations

or

for

setting

the

sensitivity

to

match

other

amplifiers

or

speakers

in

a

surround

sound

system.

Turn

the

LEVEL

controls

clockwise

for

greater

sensitivity,

and

counterclockwise

for

less

sensitivity.

5.

BRIDGED

SWITCHES

(ON

REAR

PANEL)

When

the

BRIDGED

switch

is

in

the

STEREO

position,

this

(A,

B

or

C)

is

a

2-channel

power

amplifier.

When

the

BRIDGED

switch

is

in

the

BRIDGED

position,

this

(A,

B

or

C)

is

a

single

channel

power

amplifier.

ILLUSTRATION

5

-

FRONT

PANEL

©

©

®

©

4

SPECIFICATIONS

Continuous

Power

Output.

DIN

Output.

Peak

Current.

Power

Output

(BTL).

Total

Harmonic

Distortion

(THD).

(20

to

20,000Hz)

Intermodulation

Distortion.

(60

Hz

:

7

kHz

=

4:1)

Output

(Speakers).

Damping

Factor.

Input

Sensitivity/Impedance.

Overload

Level

(THD

0.5

%,

1

kHz)....

Frequency

Response.

Signal

to

Noise

Ratio

(IHF,

A

network)

30

watts*

per

channel,

min.

RMS

both

channels

driven

into

8

ohms

from

20

to

20,000

Hz

with

no

more

than

0.03%

THD.

50

watts

per

channel

(1kHz,

4

ohms,

1%

THD)

20A

(0.1

ohms,

10

psec,

1

pulse)

90

watts

(bridged)

min.

RMS

driven

into

8

ohms

from

20

to

20,000Hz

with

no

more

than

0.03%

THD.

No

more

than

0.03%

(continuous

rated

power

output).

No

more

than

0.03%

(continuous

1/2

rated

power

output).

No

more

than

0.05%

(1

watt

per

channel

power

output,

8

ohms).

No

more

than

0.05%

(continuous

rated

power

output)

No

more

than

0.05%

(continuous

1/2

rated

power

output).

No

more

than

0.05%

(1

watt

per

channel

power

output,

8

ohms).

8

ohms

min

(bridged

mode):

4-16

ohms

(stereo

mode)

180

(20

to

20,000

Hz,

8

ohms)

1.0

V/27

kohms

5

V

10

to

80,000

Hz,+1

dB.-1.0dB

105

dB

GENERAL

Power

Requirement.120

V/60

Hz,

230-240

V/50

Hz

(depending

on

destination)

Power

Consumption.400

watts

Dimension

(overall).440

(W)

x

92

(H)

x

396

(D)

mm

7-3/8"

x

3-5/8"

x

15-5/8"

Weight

(net).10.5

kg

/

23.1

lbs

*

Measured

pursuant

to

the

Federal

Trade

Commission's

Trade

Regulation

Rule

or,

Power

Claims

for

Amplifiers

(applicable

to

the

USA

only).

NOTE:

Specifications

and

design

are

subject

to

possible

modification

without

notice.

5