Roland Cpm-300 User manual

HATTA

TIAN

Roland’

EETTTUUTEUETTER

TET

TTT

de

POWERED

MIXER

CreM-300

OWNER'S

MANUAL

Main

Features

@

Lightweight,

Compact,

and

Energy-Efficient

Employing

the

latest

developments

in

high-efficiency

amplifier

technology,

the

CPM-300

packs

a

powerful

150

watts

per

channel

{into

4

ohms),

yet

weighs

a

mere

6.0

kilograms,

consumes

only

half

the

energy,

and

generates

just

one-third

the

heat

of

mixers

(in

actual

operation,

compared

with

other

Roland

mixers).

The

com-

pact

design

means

you

can

easily

find

space

to

set

it

up,

and

it

travels

a

lot

easier.

The

handles

make

this

piece

of

gear

easy

to

carry,

too.

The

CPM-300

is

ideal

as

a

simple

PA

for

a

variety

of

events,

and

since

it

is

air-cooled,

it

stays

quiet.

@

Packed

with

Features,

Yet

Simple

to

Operate

The

CPM-300

provides

six

mono

and

two

stereo

channels

for

a

total

of

ten

input

channels.

With

its

widely-

adjustable

input

circuits,

the

SENS

knobs

allow

you

to

adjust

the

input

sensitivity

with

the

twist

of

just

one

control.

This

allows

the

CPM-300

to

accept

a

wide

range

of

inputs,

from

mics

to

CD

players

to

electronic

instruments,

all

with

a

simple

adjustment.

@

Easy

Elimination

of

Irritating

Feedback

The

CPM-300

features

a

digitally

processed

“Anti-Feedback"

function.

Feedback

is

automatically

detected

and

elim-

inated

the

instant

it

begins.

@

The

high-quality

internal

effects

include

four

types

of

digital

reverb.

A

few

simple

steps

let

you

perform

with

these

superior

effect

sounds,

from

karaoke-style

echo

to

concert

hall

reverb

sound,

with

ease.

@

Limiter

Included

in

Power

Amp

Section

The

mixer's

amplifier

is

equipped

with

a

limiter

circuit,

providing

protection

against

the

clipping

that

can

cause

distor-

tion

and

blown

speakers.

@

Protection

Circuits

for

Added

Reliability

With

a

PC

Limiter

Circuit

which

guards

against

shorting

in

the

output,

a

Thermal

Protection

Circuit,

a

speaker-saving

DC

Detection

Circuit,

a

Muting

Circuit

that

cuts

the

"shock

noise”

that

occurs

when

the

power

is

switched

on,

and

more,

the

CPM-300

features

a

variety

of

protection

circuits

to

ensure

dependable

operation.

New

ECOS

High-Efficiency

Amplifier

Technology

ECOS

(Etficiency

Control

Operation

System)

is

a

new

high-efficiency

amplifier

technology

developed

by

Roland.

With

this

technology,

amplifier

power

consumption

is

only

1/2

that

of

while

generating

only

1/3

of

the

heat,

all

with

no

sacrifice

in

sound

quality.

As

a

result,

the

heal

dissipation

and

power

sections

are

smailer,

making

the

mixer

fighter

and

more

compact

than

Copyright

©

1998

ROLAND

CORPORATION

Ail

rights

reserved.

No

part

of

this

publication

may

be

reproduced

in

any

form

without

the

written

permission

of

ROLAND

CORPORATION.

CAUTION

ATTENTION

aisaue

ve

choc

evectaique

Ne

pas

ouvein

CAUTION:

TO

REDUCE

THE

RISK

OF

ELECTRIC

SHOCK,

DO

NOT

REMOVE

COVER

{OA

BACK).

NO

USER-SERVICEABLE

PARTS

INSIDE.

REFER

SERVICING

TO

QUALIFIED

SERVICE

PERSONNEL.

A

The

lightning

flash

with

arrowhead

symbol,

within

an

equilateral

\riangle,

is

intended

to

alert

the

user

fo

ihe

presence

oi

uninsulated

“dangerous

voltage”

within

the

product's

enclosure

that

may

be

of

sufficient

magnitude

to

constitute

a

risk

of

electric

shock

to

persons.

The

exclamation

point

within

an

equilateral

triangle

is

intended

to

alert

the

user

to

the

presence

of

important

operating

and

maintenance

(servicing)

instructions

in

the

literature

accompanying

the

product.

INSTRUCTIONS

PERTAINING

TO

A

RISK

OF

FIRE,

ELECTRIC

SHOCK,

OR

INJURY

TO

PERSONS.

IMPORTANT

SAFETY

INSTRUCTIONS

SAVE

THESE

INSTRUCTIONS

WARNING

-

When

using

electric

products,

basic

precautions

shauid

always

be

followed,

including

the

following:

1.

Read

all

the

instructions

before

using

the

product

2.

Do

not

use

this

product

near

water

—

for

example,

near

a

bathtub,

washbowl,

kitchen

sink,

in

a

wet

basement,

or

near

a

swimming

pool,

or

the

like.

3.

This

product

should

be

used

only

with

a

cart

or

stand

that

is

recommended

by

the

manufacturer.

8.

The

power-supply

cord

of

the

product

should

be

unplugged

from

the

outlet

when

leit

unused

for

a

long

periad

of

time.

9,

Care

should

be

taken

so

that

objects

do

not

fall

and

tiquids

are

not

spilled

into

the

enclosure

through

openings.

10.The

product

should

be

serviced

by

qualified

service

personnel

when:

4.

This

product,

either

alone

or

in

combination

with

an

amplifier

A.

The

power-supply

cord

or

the

plug

has

been

damaged;

or

and

headphones

or

speakers,

may

be

capable

of

producing

B.

Objects

have

fallen,

or

liquid

has

been

spilled

into

the

sound

levels

that

could

cause

permanent

hearing

loss.

Do

product;

or

not

operate

for

a

tong

period

of

time

at

a

high

volume

level

C.

The

product

has

been

exposed

to

rain;

or

at

a

jevel

that

is

uncomfortable.

If

you

experience

any

D.

The

product

does

no!

appear

to

operate

normally

or

hearing

loss

or

ringing

in

the

ears,

you

should

consult

an

exhibits

a

marked

change

in

performance;

or

audiologist.

—.

The

product

has

been

dropped,

or

the

enclosure

.

The

product

should

be

located

so

that

its

tocation

or

position

damaged.

does

not

intertere

with

its

proper

ventilation.

11.Do

not

attempt

to

service

the

product

beyond

that

described

.

The

product

should

be

located

away

from

heat

sources

such

in

the

user-maintenance

instructions.

All

other

servicing

as

radiators,

heat

registers,

or

other

products

that

produce

should

be

referred

to

qualified

service

personnel.

heat.

7.

The

product

shauld

be

connected

to

a

power

supply

only

of

the

type

described

in

the

operating

instructions

or

as

marked

on

the

product.

ana

For

the

USA

GROUNDING

INSTRUCTIONS

This

product

must

be

grounded.

If

it

should

malfunction

or

breakdown,

grounding

provides

a

path

of

least

resistance

for

electric

current

to

reduce

the

risk

of

electric

shock,

This

product

is

equipped

with

a

cord

having

an

equipment-grounding

conductor

and

a

grounding

plug.

The

plug

must

be

plugged

into

an

appropriate

outlet

that

is

property

installed

and

grounded

in

accordance

with

all

local

codes

and

ordinances.

DANGER:

Improper

connection

of

the

equipment-grounding

conductor

can

result

in

a

risk

of

electric

shock.

Check

with

a

qualified

electrician

or

serviceman

if

you

are

in

doubt

as

to

whether

the

product

is

properly

grounded.

Do

not

modify

the

plug

provided

with

the

product

—

if it

will

not

fit

the

outiet,

have

a

proper

outlet

installed

by

a

qualified

electrician,

For

the

U.K.

WARNING:

THIS

APPARATUS

MUST

BE

EARTHED

IMPORTANT:

THE

WIRES

IN

THIS

MAINS

LEAD

ARE

COLOURED

IN

ACCORDANCE

WITH

THE

FOLLOWING

CODE.

GREEN-AND-YELLOW:

EARTH,

BLUE:

NEUTRAL,

BROWN:

LIVE

As

the

colours

of

the

wires

in

the

mains

lead

of

this

apparatus

may

not

correspond

with

the

coloured

markings

identifying

the

terminals

in

your

plug,

proceed

as

tollows:

The

wire

which

is

coloured

GREEN-AND-YELLOW

must

be

connected

to

the

terminal

in

the

plug

which

is

marked

by

the

letter

E

or

by

the

safety

earth

symbol

Qor

coloured

GREEN

or

GREEN-AND-YELLOW.

The

wire

which

is

coloured

BLUE

must

be

connected

to

the

terminal

which

is

marked

with

the

letter

N

or

coloured

BLACK.

The

wire

which

is

coloured

BROWN

must

be

connected

to

the

terminal

which

is

marked

with

the

fetter

L

or

coloured

RED.

The

product

which

is

equipped

with

a

THREE

WIRE

GROUNDING

TYPE

LINE

PLUG

must

be

grounded.

SING

THE

UN

ELY

About

Z\

WARNING

and

A\

CAUTION

Notices

Used

for

instructions

intended

to

alert

the

user

to

the

risk

of

death

or

severe

A\WARNING

injury

should

the

unit

be

used

improperty.

Used

for

instructions

intended

to

alert

the

user

to

the

risk

of

injury

or

material

damage

should

the

unit

be

used

improperly.

A\

CAUTION

*

Material

damage

refers

to

damage

or

other

adverse

effects

caused

with

respect

to

the

home

and

all

its

furnishings,

as

well

to

domestic

animals

or

pets.

seseeseneesrenenetenersnecteteteneces

ALWAYS

OBSERVE

THE

FOLLOWING

*

Before

using

this

unit,

make

sure

to

read

the

\\

instructions

below,

and

the

Owner's

Manual.

*

Do

nat

open

or

perform

any

internal

modifications

®

on

the

unit.

*

Make

sure

you

always

have

the

unit

placed

so

it

is

eo

level

and

sure

to

remain

stable.

Never

place

it

on

stands

that

could

wobble,

or

on

inclined

surfaces.

«

Avoid

damaging

the

power

cord.

Do

not

bend

it

OQ

excessively,

step

on

it,

place

heavy

objects

on

it,

etc.

A

damaged

cord

can

easily

become

a

shock

or

fire

haz-

ard.

Never

use

a

power

cord

after

it

has

been

dam-

aged.

*

In

households

with

smail

children,

an

adult

should

provide

supervision

until

the

child

is

capable

of

fol-

lowing

ail

the

rules

essential

for

the

safe

operation

of

the

unit.

°

Protect

the

unit

from

strong

impact.

(Do

not

drop

it!)

*

Do

nat

force

the

unit's

power-supply

cord

to

share

SO

an

outlet

with

an

unreasonable

number

of

other

devices.

Be

especially

careful

when

using

extension

cords—the

total

power

used

by

all

devices

you

have

connected

to

the

extension

cord's

outlet

must

never

exceed

the

power

rating

(watts/amperes)

for

the

extension

cord.

Excessive

loads

can

cause

the

insula-

tion

on

the

cord

to

heat

up

and

eventually

melt

through.

INSTRUCTIONS

FOR

THE

PREVENTION

OF

FIRE,

ELECTRIC

SHOCK,

OR

INJURY

TO

PERSONS

About

the

Symbols

The

A

symbol

alerts

the

user

to

important

instructions

or

warnings.The

specific

meaning

of

the

symbol

is

ZX

determined

by

the

design

contained

within

the

triangle.

In

the

case

of

the

symbol

at

left,

it

is

used

for

general

cautions,

warnings,

or

alerts

to

danger.

The

©

symbol

alerts

the

user

to

items

that

must

never

be

carried

out

(are

forbidden).

The

specific

thing

that

®

must

not

be

done

is

indicated

by

the

design

contained

within

the

circle.

In

the

case

of

the

symbol

at

left,

it

means

that

the

unit

must

never

be

disassembled.

The

@

symbol

alerts

the

user

to

things

that

must

be

carried

out.

The

specific

thing

that

must

be

done

is

Z

indicated

by

the

design

contained

within

the

circle.

In

the

case

of

the

symbol

at

left,

it

means

that

the

power-

cord

plug

must

be

unplugged

from

the

outlet.

ZA\WARNING

¢

Before

using

the

unit

in

a

foreign

country,

camult7N

with

your

retailer,

the

nearest

Roland

Service

Center,

or

an

authorized

Roland

distributor,

as

listed

on

the

“Information”

page.

CAUTION

*

Always

grasp

only

the

plug

on

the

power-supply

&

cord

when

plugging

into,

or

unplugging

from

an

out-

let.

¢

Try

to

prevent

cords

and

cables

from

becoming

entangled.

Also,

all

cords

and

cables

should

be

placed

so

they

are

out

of

the

reach

of

children.

*

Never

climb

on

top

of,

nor

place

heavy

objects

on

OQ

the

unit.

*

Never

handle

the

power

cord

or

its

plug

with

wet

&)

hands

when

plugging

into,

or

unplugging

from,

an

outlet.

*

Before

moving

the

unit,

disconnect

the

power

plug

A

from

the

outlet,

and

pull

out

all

cords

from

external

devices.

*

Before

cleaning

the

unit,

turn

off

the

power

and

€:

unplug

the

power

cord

from

the

outlet

(p.

9).

-

*

Whenever

you

suspect

the

possibility

of

lighting

A

in

your

area,

pull

the

plug

on

the

power

cord

out

of

“™®

the

outlet.

Important

Notes

In

addition

to

the

items

listed

under

“IMPORTANT

SAFETY

INSTRUCTIONS”

and

“USING

THE

UNIT

SAFELY”

on

pages

2

and

3,

please

read

and

observe

the

following:

Power

Supply

*

Do

not

use

this

unit

on

the

same

power

circuit

with

any

device

that

will

generate

line

noise

(such

as

an

electric

motor

or

variable

lighting

system).

¢

Before

connecting

this

unit

to

other

devices,

turn

off

the

power

to

all

units.

This

will

help

prevent

malfunctions

and/or

damage

to

speakers

or

other

devices.

Placement

¢

Using

the

unit

near

power

amplifiers

(or

other

equipment

containing

large

power

transformers)

may

induce

hum.

To

alleviate

the

problem,

change

the

orientation

of

this

unit;

or

move

it

farther

away

from

the

source

of

interference.

*

This

device

may

interfere

with

radio

and

television

reception.

Do

not

use

this

device

in

the

vicinity

of

such

receivers.

Maintenance

*

For

everyday

cleaning

wipe

the

unit

with

a

soft,

dry

cloth

or

one

that

has

been

slightly

dampened

with

water.

To

remove

stubborn

dirt,

use

a

cloth

impregnated

with

a

mild,

non-abrasive

detergent.

Afterwards,

be

sure

to

wipe

the

unit

thoroughly

with

a

soft,

dry

cloth.

*

Never

use

benzine,

thinners,

alcohol

or

solvents

of

any

kind,

to

avoid

the

possibility

of

discoloration

and/or

deformation.

Additional

Precautions

¢

Use

a

reasonable

amount

of

care

when

using

the

unit’s

buttons,

sliders,

or

other

controls;

and

when

using

its

jacks

and

connectors.

Rough

handling

can

lead

to

malfunctions.

*

When

connecting

/

disconnecting

all

cables,

grasp

the

connector

itself—never

pull

on

the

cable.

This

way

you

will

avoid

causing

shorts,

or

damage

to

the

cable’s

internal

elements.

¢

A

small

amount

of

heat

will

radiate

from

the

unit

during

normal

operation.

¢

To

avoid

disturbing

your

neighbors,

try

to

keep

the

unit’s

volume

at

reasonable

levels

(especially

when

it

is

late

at

night).

*

When

you

need

to

transport

the

unit,

package

it

in

the

box

{including

padding)

that

it

came

in,

if

possible.

Otherwise,

you

will

need

to

use

equivalent

packaging

materials.

Using

The

Unit

Safely....sccssesssscssssssssesssessssessressssssssssessnssssesssessnesssesssersnecsusersessseconsssssesnsennesansssassnosanees

3

Important

Notes

.......ssccosscssssssssssessssscstssnecaneceneessvessnesssessnsenessnessuessuesassssnsescessvessesasessssssavecesccsesessenesenensnes?

4

DN

arives

aid

Beri

c

hives

sca

scs

sav

cas

secs

ces

ccecs

vavancnspinca

sets

da

sbucde

Savon

nv

Uubazs

caicpes

ia

vanang

dvb

bshaev

eon

danuevnisevenneiuians

6

Front

Panel..........

Channel

Section

Master

Section

..

Jacks

and

Connector:

Rear

Panel...

Side

Panel

Connections...

Basic

Connections:

An

Example....

es

Connecting

an

External

Effects

Frocesser

or

Equalizer

Checking

Out

the

Sound..........

Precautions

When

Turning

on

the

Power..

Producing

Sound

with

Microphones

(Basic

Knobs

and

Faders

Adjustments)

.

Adjusting

the

Sound

Quality

with

the

Equalizer

Adding

Reverberation

to

the

Sound

(Digital

Reverb)...........sssssssssssssscsssssseesessressecsnssasecneeraneeneceses

13

Operating

the

Digital

Reverb

sssscsciss.cicssccsessiesisssctestccssssesoovssseucebosanusbesgest

cgoutonrss

seacdanstebuse

sag

svdodanacondareosacoesdae

13

Eliminating

Feedback

(Anti-Feedback

Function)....

How

to

Avoid

Feedback

.....

Using

the

CPM-300's

Anti-Feedback

Function

Procedure

for

Operating

the

Auto

Adjust

Function

Notes

Regarding

the

Auto

Adjust

Function.

Dynamic

Adjust

Function.

Common

Notes

about

the

Auto

Adjust

and

Dynamic

Adjust

Functions

Further

Details

on

the

Anti

Feedback

Function...

How

the

Removal

of

Feedback

is

Achieved

About-

the

Safety:

Margin

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About

the

Protection

Circuits.

Troubleshooting

.........sesccssesssesseecsesseesccnssnesscssnscssssvesesavesesenssesenssenesessnesuneneenseneeenes

+18

Specifications...

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Input/Output

Standards

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Block

Diag

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assis.

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22

Dimensions

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23

Blank

User

Settings

Chart

........ccssssscssescssssnesssessssssesssessnesssesssesssesssessssssvassesssauesssessessavssaseenessecsnnecsnesene

24

Names

and

Functions

of

Each

Part

Front

Panel

3

LY

TE

ES

YS

000000000000§

EStbpaaesece

0900060000000

of

a

—_

=

13

Channel

Section

Input

Channels

1-6

(MONO)

7-8,

9-10

(STEREO)

1.SENS

Knob

This

adjusts

the

sensitivity

to

ensure

the

proper

input

signal

level.

Adjust

this

knob

so

that

the

PEAK

indicator

(6)

does

not

light

too

frequently.

*

Rated

Input

Level

Channel

1-6:

+4

dBm

to

-60

dBm

Channel

7-8,

9-10:

+4

dBm

to

-20

dBm

2.EQ

(Equalizer)

Knob

Use

these

to

adjust

the

tone

quality

of

the

input

signal.

Setting

a

knob

to

the

0

position

provides

a

flat

response.

(>

p.

12)

3.SEND

Knob

This

adjusts

the

output

level

of

the

signal

sent

to

the

Master

section

SEND

knob

(9).

*

Output

is

normal

when

the

knab

is

set

to

the

0

position.

*

This

signal

is

output

after

passing

through

the

channel

fader

(post-fader).

(Refer

to

the

Block

Diagram

—

p.

22,

4.PAN

(Panpot)

Knob

This

knob

assigns

the

left-right

distribution

of

each

channel's

output,

localizing

the

sound

within

the

stereo

field.

At

center

position,

sound

is

localized

at

the

center

of

the

field

(i.e.,

both

the

left

and

right

channels

are

output

at

the

same

volume).

5.BAL

(Balance)

Knob

This

adjusts

the

left-right

balance

of

the

output,

adjusting

the

apparent

location

of

the

sound

in

the

stereo

field.

At

center

position,

sound

is

localized

at

the

center

(the

volume

is

the

same

in

both

the

left

and

right

channels).

6.

PEAK

Indicator

These

indicators

light

in

red

when

the

input

signal

level

is

too

high.

They

go

on

at

6

dBm

before

clipping,

warning

that

the

signal

is

approaching

clipping

levels.

The

signal

monitored

by

the

PEAK

indicator

is

post-EQ

and

post-

fader

(please

refer

to

the

Block

Diagram

—

p.

22).

Adjust

the

SENS

knob

(1)

and

Channel

fader

(7)

so

that

the

indi-

cator

does

not

light

up

too

frequently.

7.Channel

Faders

Each

fader

adjusts

the

output

for

its

corresponding

channel.

The

black

areas

along

the

fader

markings

make

it

easy

to

determine

the

range

within

which

the

faders

can

be

set

to

avoid

distortion

and

noise.

*

Output

is

normal

when

the

fader

is

set

to

the

0

position.

Master

Section

8.DSP

PROCESSING

@DIGITAL

REVERB

The

CPM-300

offers

four

types

of

internal

digital

reverb.

(=

p.

13)

@ANTI

FEEDBACK

Feedback

is

automatically

detected

and

eliminated

the

instant

it

begins.

(—

p.

14)

9.SEND/RETURN

@SEND

Knob

This

takes

the

signals

adjusted

by

means

of

the

individual

channel

SEND

knobs

(3),

mixes

them,

adjusts

the

output,

and

sends

it

to

the

DSP

PROCESSING

(internal

digital

reverb)

(8).

An

identical

signal

is

also

sent

to

the

SEND

jack

in

the

connector

section.

*

Output

is

normal

when

the

knob

is

set

to

the

0

position.

@RTN

(Return)

Knob

This

adjusts

the

input

signal

from

the

connector

section's

RETURN

jack.

*

Input

is

normal

when

the

knob

is

set

to

the

0

position.

10.MASTER

LEVEL

Meter

This

meter

indicates

the

mixer

section's

output

level

(MIXER

OUT

level).

When

the

0

indicator

is

lit,

it

indicates

that

the

output

level

is

at

+4

dBm.

The

output

of

the

mixer

section

is

sent

to

the

amplifier

section,

and

this

signal

is

output

from

the

speaker

terminals

on

the

rear

panel

at

100

watts

(when

speakers

with

of

8

ohms

are

connected).

*

When

cables

are

connected

to

the

AMP

IN

jacks,

the

mixer

and

amplifier

sections

are

separated,

and

the

signal

from

the

mixer

section

is

isolated.

(—>

p.

11)

11.POWER

Indicator

This

indicator

lights

up

when

the

power

up

on.

12,PHONES

Knob

This

adjusts

the

headphones

volume.

*

The

signal

used

for

the

headphones

is

taken

before

the

MASTER

faders

(pre-fader)

(please

refer

to

the

Block

Diagram

—

p.

22).

*

The

headphones

of

this

unit

may

be

capable

of

producing

sound

levels

that

could

cause

permanent

hearing

loss.

Do

not

oper-

ate

for

a

long

period

of

time

at

a

high

volume

Jevel,

or

at

a

level

that

is

uncomfortable.

13.MASTER

Faders

(LEFT/RIGHT)

These

adjust

the

final

output

level

of

the

mix.

The

black

areas

along

the

fader

markings

make

it

casy

to

determine

the

range

within

which

the

faders

can

be

set

to

avoid

distortion

and

noise.

*

Output

is

normal

when

the

fader

is

set

to

the

0

position.

*

The

CPM-300's

power

amp

features

a

built-in

limiter

circuit.

This

monitors

the

signal

from

the

CPM-300's

mixer

to

prevent

clipping

in

the

amp

that

can

cause

distorted

sound

and

blown

speakers.

14

15

1617

18

19

UUULADUUTAM

TTT

it

PT

TY

TO

a

Jacks

and

Connectors

14.INPUT

These

connector

and

jacks

accept

input

of

signals.

Channel

1

(MONO)

@XLR

Type

(Unbalanced

Input)

*

Pins

are

wired

as

shown

in

the

diagram

below.

Before

con-

necting

other

devices,

confirm

that

the

assignment

matches

that

of

the

CPM-300's

input.

*

3

is

connected

to

ground;

take

care

when

connecting

to

devices

featuring

balanced

outs.

1:GND

2:HOT

3:GND

@TRS

Standard

Phone

Type

(Unbalanced

Input)

*

Pins

are

wired

as

shown

in

the

diagram

below.

Before

con-

necting

other

devices,

confirm

that

the

assignment

matches

that

of

the

CPM-300's

input.

*

The

ring

is

connected

to

ground;

take

care

when

connect-

2

ing

to

devices

featuring

balanced

outs.

GNO(RING)

GND{SLEEVE)

HOT{TIP}

HOT(TIP)

*

Use

only

one

of

the

two

inputs

at

any

one

time.

Connecting

to

both

inputs

may

result

in

insufficient

volume.

Channels

2-6

(MONO),

Channels

7-8

(STEREO)

@Standard

Phone

Type

Channels

9-10

(STEREO)

@Standard

Phone

Type

@RCA

Phono

Type

*

You

can use

either

one.

When

both

are

used

at

the

same

ume,

connection

to

the

standard

type

is

given

priority,

and

the

other

remains

unconnected.

RAD

Roland

CPpM-300

POWERED

150w+150w

15.RETURN

Jack

(Standard

Phone

Type)

This

is

used

for

connecting

external

effects

devices.

The

signal

returned

from

the

effect

device

is

input

here

(>

p.

11).

This

also

can

be

used

as

an

auxiliary

input.

Mono

input

is

possible

by

connecting

only

to

the

L

input.

16.SEND

Jack

(Standard

Phone

Type)

This

is

used

for

connecting

external

effects

devices.

The

signal

sent

to

the

effect

device

is

output

here

(>

p.

11).

17.REC

OUT

Jack

(RCA

Phono

Type)

These

are

the

output

jacks

for

recording.

Use

these

to

connect

to

external

recording

devices and

similar

equipment.

*

This

signal

is

taken

before

the

MASTER

fader

(pre-fader)

(please

refer

to

the

Block

Diagram

—>

p.

22).

While

the

MIXER

OUT

signal

is

output

from

this

connector,

it

is

unaf-

fected

by

the

MASTER

faders

(rated

output

level

:

-10

dBm).

Returning

the

output

of

the

recording

device

during

recording

may

result

in

unwanted

oscillations

in

the

sound.

During

recording,

completely

lower

the

fader

(set

the

fader

to

infinity)

for

the

input

channel

connected

to

the

output

of

the

recording

device.

18.MIXER

OUT/AMP

IN

Jack

(Standard

Phone

Type)

Connect

an

equalizer

or

compressor/limiter

here.

(~

p.

11)

*

When

cables

are

connected

to

the

AMP

IN

jacks,

the

mixer

and

amplifier

sections

are

separated,

and

the

signal

from

the

mixer

section

is

isolated.

(>

p.

11)

*

Deo

not

connect

MIXER

OUT

Jacks

directly

to

the

speakers.

19.PHONES

Jack

(Stereo

Standard

Phone

Type)

Headphones

are

plugged

in

here.

Rear

Panel

g

fe

0)

A

ane

A

Soemnrd.

feces

+o

EMER

serenay

seencrenres]

ATTENTION:

aan

m

crce

sacrwan

na

mo

are

WARNING:

romance

ra

mac

ere

oneterme

RE

avon!

hat

Doone

Rison

nono

ours

|

oun

pope

ae

Eames

=

N25

ioe

|

(CE

1

2

*

Turn

the

power

on

and

off

only

after

completely

turing

down

all

volume

levels

by

lowering

the

faders

and

volume

controls

1.POWER

Switch

on

the

CPM-300

and any

connected

equipment.

2.Speaker

Connection

Terminals

(Binding

Post,

Standard

Phone

Type)

These

are

the

jacks

and

terminals

for

connecting

the

speakers.

Two

systems

may

be

connected

simultaneously.

Minimum

recommended

load

impedance

for

the

CPM-300's

power

amp

is

4

ohms.

<Combining

Speakers>

Nor

Be

sure

to

check

the

combined

impedance

when

connecting

multiple

speaker

pairs.

When

connecting

multiple

speakers

in

parallel:

(Ex.)

8

ohms/8

ohms

—

4

ohms

YES

6

ohms/8

ohms

>

3.40hms

NO

6

ohms/6

ohms

—

3

ohms

NO

4

ohms/4

ohms

—>

2

ohms

NO

“Although

the

CPM-300

is

protected

from

damage

by

the

PC

Control

Circuit,

take

care

not

to

connect

speakers

of

less

than

4

ohms

impedance

or

to

allow

shorting

in

the

speaker

cables

<About

the

PC

Limiter

Circuit>

MEMO

The

PC

Limiter

Circuit

works

to

protect

the

CPM-300

if

the

+

and

-

wires

of

the

speaker

cable

are

shorted

or

if

speakers

with

impedance

of

less

than

4

ohms

are

used;

this

may

result

in

no

sound

from

the

speakers

or

distortion.

Side

Panel

(Left

side)

Handle

This

is

the

mixer's

carrying

handle.

*

Do

not

swing

the

unit

around

by

the

handle

or

pull

on

the

handle

with

excessive

force.

(218

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=

SUOLPIBUUOS

DISDYG

Connecting

an

External

Effects

Processor

or

Equalizer

Connect

effects

processors,

equalizers,

and

other

such

equipment

using

the

following

Jacks.

@SEND/RETURN

Jack

Use

these

jacks

when

connecting

an

effects

processor

to

add

effects

to

the

source

sound.

*

This

also

can

be

used

as

an

auxiliary

input.

Mono

input

is

possible

by

connecting

only

to

the

L

input.

@MIXER

OUT/

AMP

IN

Jack

Use

these

jacks

when

connecting

devices

such

as

equalizers

and

compressor/limiters,

which

alter

the

sound

input

to

compensate

for

acoustic

and

other

sonic

characteristics.

When

cables

are

connected

to

the

AMP

IN

jacks,

the

mixer

and

amplifier

sections

are

separated,

and

the

signal

from

the

mixer

section

is

isolated.

Effects

processor

to

add

effects

to

Equalizers

and

compressor/imiters,

whicn

alter

the

source

sound

the

sound

input

to

compensate

for

acoustic

and

other

sonic

characteristics

<MIXER

OUT/AMP

IN

Jack>

In

addition

to

their

use

in

connecting

devices

such

as

equalizers

and

compressor/limiters,

the

MIXER

OUT/AMP

IN

jacks

can

also

be

used

in

the

following

circumstances

@When

volume

levels

greater

than

the

CPM-300's

internal

power

amp

can

provide

are

needed,

connect

to

an

auxiliary

power

amp

and

speakers

>

Connect

to

MIXER

OUT

jacks

(refer

to

the

figure

below).

@When

you

want

to

use

the

CPM-300's

power

amp

only

—

Connect

to

AMP

IN

Jack

Just

as

with

the

CPM-300's

mixer

signal,

the

amplifier's

built-in

limiter

circuit

works

to

prevent

the

signal

input

from

the

AMP

IN

jacks

from

causing

distortion

and

speaker

damage.

<Using

Additional

Power

Amps

and

Speakers>

The

output

from

the

MIXER

OUT

jacks

can

be

sent

to

a

separate

power

amp.

11

Checking

Out

the

Sound

Precautions

When

Turning

on

the

Power

OTo

protect

against

malfunction

and

damage

to

speakers

and

other

equipment,

proceed

with

the

following

only

after

turning

down

the

volume

for

all

devices.

Turn

each

channel's

SENS

knob

completely

counterclockwise.

4

Set

each

channel's

EQ

knobs

to

0

(12

o'clock

position).

Set

each

channel's

PAN

and

BAL

knobs

to

the

12

o'clock

position.

Turn

each

channel's

SEND

and

RETURN

knobs

completely

counterclockwise.

Completely

lower

all

channel

faders.

After

properly

connecting

the

equipment,

switch

on

the

power

for

each

device

in

sequence,

starting

with

the

device

producing

the

sound,

or

into

which

the

audio

signals

first

enter

(reverse

the

order

when

shutting

off

the

equip-

ment).

Ex.)

CD

Player,

Synthesizer,

etc.»

Effects

Processor

or

Other

Processing

Device

-»>

CPM-300

*

Using

the

improper

sequence

when

turning

the

equipment

on

may

result

in

malfunction

or

damage

to

speakers

or

other

equipment.

*

After

the

CPM-300

is

switched

on,

a

protection

circuit

(the

Muting

Circuit)

temporarily

prevents

the

speakers

from

playing

(For

more

information

about

the

Muting

Circuit

>

p.

17)

Producing

Sound

with

Microphones

(Basic

Knobs

and

Faders

Adjustments)

Now,

try

using

a

microphone

to

get

some

sounds.

1.Connect

a

microphone

to

the

CPM-300,

and

rotate

the

SENS

knob

slowly

clockwise

while

speaking

into

the

micro-

phone

until

the

PEAK

indicator

lights

up

from

time

to

time,

then

lower

the

level

slightly

to

set

the

knob

position.

2.Raise

the

channel

fader

to

the

0

position

(in

the

black

range).

3.Adjust

the

overall

volume

with

the

MASTER

fader.

Adjust

the

SENS

knob

again

if

the

PEAK

indicator

shows

that

the

signal

is

too

hot

(strong).

4.Set

the

sound

image

for

each

channel

with

the

PAN

and

BAL

knobs.

MEMO

The

black

range

along

the

channel

fader

and

MASTER

fader

markings

indicate

the

normal

range

within

which

you

can

operate

free

of

distortion

or

noise.

*

Basic

adjustments

are

the

same

as

those

made

with

CD

players

and

other

electronic

musical

instruments.

After

making

rough

adjustments

on

the

connected

devices,

proceed

to

“Adjusting

the

Sound

Quality

with

the

Equalizer’.

Adjusting

the

Sound

Quality

with

the

Equalizer

The

EQ

(equalizer)

knobs

adjust

the

tone

for

each

channel's

input

signals.

Try

rotating

the

EQ

knobs

while

listening

to

the

sound

coming

from

the

speakers

(or

headphones).

At

the

0

position,

the

signal

is

“flat”

(the

same

as

the

source

sound).

@HIGH:

This

adjusts

the

tone

in

the

higher

frequency

range.

With

12

kHz

as

the

center

frequency,

the

volume

of

the

high

range

can

be

adjusted

15

dB

up

or

down.

Lowering

the

HIGH

EQ

cuts

the

high

frequencies,

resulting

in

a

milder

tone.

Lowering

this

too

much

creates

a

tone

that

is

dull

and

dark.

@

Raising

the

HIGH

EQ

boosts

the

high

frequencies,

providing

a

sound

that

is

bright

and

crisp.

Raising

this

too

much

creates

a

sharp,

edgy

tone.

@LOW:

This

adjusts

the

tone

in

the

lower

frequency

range.

Centered

on

80

Hz,

the

volume

of

the

low

range

can

be

adjusted

15

dB

up

or

down.

@

Lowering

the

LOW

EQ

cuts

the

low

frequencies.

Use

this

technique

to

improve

vocal

intelligibility

(such

as

in

speeches)

in

meeting

rooms

and

similar

venues.

@

Raising

the

LOW

EQ

boosts

the

low

tones.

Use

this

on

input

from

CDs

or

electronic

instruments

to

give

the

sound

more

punch,

After

adjusting

the

sound

with

the

equalizer,

proceed

to

“Adding

Reverberation

to

the

Sound

(Digital

Reverb)"

(3

-

13).

an

"Blank

User

Settings

Chart”

can

be

found

on

p.

24.

Use

this

chart

to

record

connections

to

other

equipment,

knob

positions,

and

other

settings.

12

Adding

Reverberation

to

the

Sound

(Digital

Reverb)

The

CPM-300

offers

four

types

of

internal

digital

reverb.

DSP

PROC

DIGITAL

REVERB

eco

aay

TIME

Knob

Reverb

Mode

Switches

LEVEL

Knob

SEND

Knob

(Master

Section)

Reverb

Mode

(Reverb

Types)

@ECHO

‘This

is

an

echo

effect

perfect

for

karaoke.

@HALL

This

reverb

simulates

the

reverberation

found

in

concert

halls.

@STAGE

:This

simulates

the

reverberation

you

hear

on

a

stage.

@ROOM

‘This

simulates

the

reverberation

found

in

smaller

rooms.

Operating

the

Digital

Reverb

1.Select

the

Reverb

made.

2.Set

the

SEND

knobs

to

0

(12

o'clock

position)

on

any

channel

on

which

reverb

is

to

be

added

to

the

sound.

3.Rotate

the

SEND

knob

(Master

Section)

to

adjust

the

level

of

the

signal

sent

to

the

internal

digital

reverb.

4.Rotate

the

LEVEL

knob

to

adjust

the

overall

reverb

level.

5.Rotate

the

TIME

knob

to

adjust

the

reverb

time.

6.Readjust

the

SENS

knobs,

SEND

knobs,

and

faders

on

each

channel

as

needed.

If

you

have

a

mic

connected,

proceed

to

"Eliminating

Feedback

(Anti-Feedback

Function)"

(>

p.

14).

13

Eliminating

Feedback

(Anti-Feedback

Function)

Awful,

ear-splitting

whines

and

screeching

sounds

referred

to

as

"feedback"

occur

when

the

output

from

the

speak-

ers

reenters

the

microphone,

when

it

is

further

amplified

and

then

output

again,

over

and

over,

creating

a

feedback

loop

which

results

in

these

unpleasant

oscillations

in

the

sound.

Feedback

crops

up

readily

when

the

mic

volume

is

set

too

high,

or

when

the

mic

is

pointed

at

or

placed

too

closed

to

a

speaker.

How

to

Avoid

Feedback

The

following

describes

measures

you

can

take

to

help

prevent

feedback

from

becoming

a

problem.

@Select

the

proper

output

level

for

the

particular

room

or

venue.

@Separate

mics

and

speakers

as

much

as

possible,

and

avoid

pointing

mics

in

the

direction

of

the

speakers

@Set

the

volume

levels

of

connected

instruments

at

appropriate

levels.

In

actuality,

however,

feedback

may

still

occur

even

though

you've

observed

the

preventive

measures

listed

above.

Using

the

CPM-300's

Anti-Feedback

Function

The

CPM-300's

built-in

"Anti-Feedback

Function"

is a

function

that

automatically

detects

feedback

the

instant

it

begins,

after

which

the

Anti-Feedback

Filters

then

eliminate

the

feedback.

The

Anti-Feedback

Function

feature

includes

two

functions.

@Auto

Adjust

Function

You

can

eliminate

feedback

before

your

performances

by

running

the

Auto

Adjust

Function

during

your

sound

check

or

rehearsal.

@Dynamic

Adjust

Function

This

function

monitors

and

instantly

cuts

unexpected

feedback

during

performances.

Procedure

for

Operating

the

Auto

Adjust

Function

ON/OFF

Indicator

ia

|

ON/OFF

Switch

AUTO

SET

Indicator

e

AUTO

SET

Switch

1.Set

up

microphones

at

the

positions

they

will

be

used,

then

switch

them

on.

2.Switch

the

ON/OFF

switch

to

ON.

3.Ready

the

mixer

by

raising

the

faders

on

channels

to

which

microphones

or

other

inputs

are

connected,

and

the

MASTER

fader

to

appropriate

levels.

4.Hold

down

the

AUTO

SET

switch

for

at

least

two

seconds.

The

AUTO

SET

indicator

flashes,

and

while

feedback

is

generated,

the

point

at

which

the

feedback

starts

is

automat-

ically

detected,

and

the

feedback

is

eliminated.

5.The

setting

is

fixed

when

the

AUTO

SET

indicator

changes

to

steady

illumination.

When

Quitting

Auto

Adjust

Function

During

the

Procedure

Press

the

AUTO

SET

switch.

The

AUTO

SET

indicator

is

illuminated,

and

the

Anti-Feedback

Filter

settings

in

effect

at

that

time

are

stored

and

retained.

Resetting

the

Auto

Adjust

Function

from

the

Beginning

Hold

down

the

AUTO

SET

switch

for

at

least

two

seconds.

The

Anti-Feedback

Filter

settings

in

effect

up

to

that

time

are

cleared,

and

determination

of

the

point

at

which

the

feedback

starts

is

begun

again.

14

Notes

Regarding

the

Auto

Adjust

Function

@Run

the

Auto

Adjust

function

only

after

setting

up

the

mics

in

the

positions

at

which

they

will

be

used.

@Do

not

speak

into

the

mics,

or

let

other

sounds

enter

the

mics

while

the

Auto

Adjust

function

is

being

run.

@Feedback

is

supposed

to

occur

while

the

Auto

Adjust

function

is

run;

this

is

not

abnormal.

To

avoid

disagreeable

sound

and

damage

to

speakers

that

can

occur

with

excessive

feedback,

lower

the

MASTER

faders

and

the

faders

for

Channels

1-6.

The

feedback

sound

is

also

output

through

the

headphone

jack.

If

you

are

using

headphones,

keep

the

PHONES

knob

turned

completely

to

the

left

during

the

Auto

Adjust

procedure.

@The

Anti-Feedback

Filters

settings

made

during

Auto

Adjust

are

stored

and

retained

even

if

the

CPM-300's

power

is

turned

off.

When

the

power

is

switched

back

on,

the

settings

in

effect

when

the

power

was

turned

off

are

recalled.

@The

AUTO

SET

indicator

goes

out

if

the

Anti-Feedback

Filters

are

not

set

(have

not

been

used),

for

example,

when

the

faders

are

lowered

during

the

Auto

Adjust

process.

When

the

AUTO

SET

indicator

goes

out,

and

then

feedback

is

no

longer

eliminated,

after

resetting

each

device

(raising

the

CPM-300's

faders,

turning

on

mic

switches,

and

so

on),

run

the

Auto

Adjust

function

once

more.

Dynamic

Adjust

Function

The

Dynamic

Adjust

Function,

which

operates

continuously

whenever

the

Anti

Feedback

ON/OFF

switch

is

set

to

ON,

monitors

and

eliminates

any

feedback

that

may

suddenly

occur

during

performances.

(However,

il

is

not

oper-

ational

while

Auto

Adjust

is

in

progress).

Common

Notes

about

the

Auto

Adjust

and

Dynamic

Adjust

Functions

@In

some

cases,

due

to

certain

device

conditions

and

settings,

feedback

may

not

be

completely

eliminated.

@The

Anti-Feedback

functions

are

effective

only

on

the

mono

Channels

1-6.

Furthermore,

the

Anti-Feedback

fune-

tions

are

not

effective

on

signals

from

any

mono

Channel

1~6

that

has

been

routed

through

the

internal

digital

reverb

by

means

of

the

channel

SEND

knobs

and

MASTER

Section's

SEND

knob.

When

Anti-Feedback

function

cannot

eliminate

feedback

while

the

internal

digital

reverb

is

in

use,

then

with

the

digital

reverb

LEVEL

knob

rotated

completely

counterclockwise

(-infinity:

no

digital

reverb

applied),

check

the

fol-

lowing.

If

feedback

is

suppressed:

The

feedback

is

caused

by

the

signal

sent

to

the

internal

digital

reverb.

The

Anti-Feedback

function

is

not

applied

to

this

signal.

Lower

the

send

levels

somewhat

with

the

mono

Channel

1-6

SEND

knobs

and

the

MAS-

TER

SEND

knob,

and

rotate

the

digital

reverb

LEVEL

knob

completely

counterclockwise

(no

digital

reverb

applied)

to

prevent

feedback

from

occurring.

¢

If

feedback

is

not

suppressed:

This

feedback

cannot

be

removed

with

Anti-Feedback

function.

After

redoing

the

settings

for

each

device,

run

the

Auto

Adjust

Function

once

more.

@Switching

the

Anti

Feedback

ON/OFF

switch

to

ON

sends

the

signal

input

to

Channels

1-6

to

the

Anti

Feedback.

To

prevent

change

in

the

sound

quality

of

electronic

musical

instruments,

CD

players,

and

other

such

devices

resulting

from

application

of

the

Anti-Feedback

Filters,

connect

devices

other

than

microphones

to

Channels

7-8

and

9-10.

Microphone

To

Channel

1

!

To

Channel

1-6

3

7-8,

9-10

CD

player,

Electronic

instruments,

etc.

OUT

PUT

15

Further

Details

on

the

Anti-Feedback

Function

How

the

Removal

of

Feedback

is

Achieved

The

CPM-300's

Anti-Feedback

function

works

by

applying

narrow-band

“filters,”

called

“Anti-Feedback

Filters,”

to

the

frequencies

at

which

feedback

is

generated,

thus

eliminating

the

feedback

by

reducing

the

volume

of

those

fre-

quencies.

The

CPM-300's

Anti-Feedback

function

features

eight

separate

filters.

With

the

"Auto

Adjust

Function,”

the

volume

is

gradually

raised,

the

intention

being

to

actually

cause

feedback.

It

detects

the

frequencies

where

feedback

occurs,

and

after

the

Anti-Feedback

Filter

settings

are

finished,

the

gain

is

returned

to

the

original

level.

When

the

Auto

Adjust

procedure

is

finished,

margin

of

gain

(called

the

“safety

mar-

gin")

is

maintained,

so

it

keeps

working

even

if

conditions

change.

Six

Anti-Feedback

Filters

are

assigned

in

the

Auto

Adjust

Function.

The

"Dynamic

Adjust

Function,”

which

operates

continuously

whenever

the

Anti-Feedback

ON/OFF

switch

is

set

to

ON

(except

when

Auto

Adjust

is

in

progress).

It

monitors

the

sound

for

feedback

during

performances,

and

elim-

inates

any

feedback

that

may

suddenly

occur.

Two

Anti-Feedback

Filters

are

used

with

the

Dynamic

Adjust

func-

tion.

The

bandwidth

of

these

eight

Anti-Feedback

Filters

is

extremely

narrow,

so

they

can

suppress

feedback

while

hav-

ing

very

little

effect

on

the

sound

quality.

About

the

Safety

Margin

At

the

completion

of

Auto

Adjust,

a

"safety

margin”

of

apporoximately

12

dB

will

have been

set

up.

However,

dur-

ing

the

Auto

Adjust

procedure,

the

Auto

indicator

will

begin

to

flash

rapidly

as

soon

as

a

safety

margin

of

6

dB

has

been

achieved.

This

conveniently

allows

you

to

stop

Auto

Adjust

while

it

is

in

progress,

if

you

believe

that

a

6

dB

margin

is

sufficient

for

your

needs.

*Auto

Adjust

ends

when

all

six

Anti-Feedback

filters

are

set,

even

if

the

approximately

12

dB

for

the

safety

margin

is

not

attained.

16

About

the

Protection

Circuits

The

CPM-300

features

special

circuitry

to

protect

the

CPM-300

and

any

connected

devices.

Whenever

this

is

activat-

ed,

the

speakers

are

prevented

from

producing

sound.

Stop

operation

of

the

equipment,

and

immediately

check

to

find

the

problem.

1.Thermal

Protection

Circuit—Protects

the

Amp

Speaker

output

is

cut

if

the

temperature

of

the

amp's

heat sink

exceeds

100

degrees

C.

Stop

operating

the

equipment

for

a

short

while

to

allow

the

heat

to

dissipate

sufficiently.

—

Although

the

unit

automatically

restarts

when

the

power

amp's

interior

temperature

falls,

if

the

overheating

pro-

tection

circuit

is

activated

again,

check

to

make

sure

that

the

operating

environment

and

connected

output

speakers

conform

to

the

CPM-300's

specifications.

Minimum

recommended

load

impedance

for

the

CPM-300's

power

amp

is

4

ohms.

2.DC

Detection

Circuit—Protects

the

Speakers

;

Whenever

DC

(direct

current)

is

generated

in

the

output

sent

to

the

speakers,

the

output

is

cut

off,

protecting

the

speakers.

—

The

CPM-300

restarts

a

few

seconds

after

generation

of

direct

current

in

the

output

ceases.

3.Muting

Circuit—Protects

the

Speakers

When

the

power

is

switched

on,

output

to

the

speakers

is

cut

for

a

few

seconds,

thereby

protecting

the

speakers

from

the

sudden

noise

that

occurs

when

the

power

is

switched

on.

17

Troubleshooting

There

is

no

sound.

@Has

the

power

cord

been

pulled

out

of

the

socket,

or

is

it

not

seated

well?

Also

check

for

any

shorts

in

the

power

cord

resulting

from

a

cut

or

broken

cord

or

from

damage

to

the

cord

covering.

@Are

the

channel

faders

or

the

MASTER

fader

lowered?

Also

check

to

make

sure

the

channel

SENS

knobs

are

not

rotated

too

far

counterclockwise.

@Connecting

a

cable

to

AMP

IN

jacks

cuts

off

the

signal

from

the

mixer

section.

When

an

equalizer

or

other

device

is

connected,

confirm

that

the

MIXER

OUT

and

AMP

IN

jacks

are

both

securely

connected.

Check

to

see

if

the

vol-

ume

of

any

device

connected

between

MIXER

OUT

and

AMP

IN

is

turned

down.

(=

p.

11)

@Is

a

device

with

a

HOT

3

connected

to

Channel

1?

3

on

the

CPM-300's

Channel

1

is

wired

to

ground.

No

sound

will

be

produced

if

3

of

the

connected

device

is

HOT.

The

assignment

for

the

CPM-300's

Channel

1

is

shown

in

the

diagram

below.

Check

the

assignments

used

by

other

devices

before

connecting

them.

XLR

Type

(Unbalanced

Input)

TRS

Standard

Phone

Type

(Unbalanced

Input)

GND(SLEEVE)

GND(RING)

GND(SLEEVE)

HOT(TIP)

@If

the

speaker

cable's

"+

and

-"

wires

are

shorted,

or

if

speakers

rated

at

less

than

4

ohms

impedance

are

connected,

the

PC

Limiter

Circuit

is

activated

in

order

to

protect

the

speakers,

and

the

sound

may

be

cut

off

or

distorted.

Check

to

make

sure

the

speaker

cables

are

not

shorted

and

that

the

speaker

impedance

is

not

less

than

4

ohms.

(PC

Limiter

Circuit

>

p.

9)

@The

Thermal

Protection

Circuit

cuts

off

the

sound

if

the

internal

power

amp

overheats.

Stop

operation

of

the

equipment

for

a

while

to

allow

the

heat

to

dissipate

sufficiently.

Although

the

unit

automati-

cally

restarts

when

the

power

amp’s

interior

temperature

falls,

if

the

Thermal

Protection

Circuit

is

activated

again,

check

to

make

sure

that

the

operating

environment

and

connected

speakers

conform

to

the

CPM-300's

specifica-

tions.

Minimum

recommended

load

impedance

for

the

CPM-300's

power

amp

is

4

ohms.

(Thermal

Protection

Circuit

>

p.

17)

@When

DC

(direct

current)

is

generated

in

the

output

sent

to

the

speakers,

the

DC

Detection

Circuit

cuts

off

the

sound

to

protect

the

speakers.

The

CPM-300

restarts

a

few

seconds

after

generation

of

direct

current

in

the

output

ceases.

(DC

Detection

Circuit

~

p.

17)

The

internal

reverb

is

not

working.

@Make

sure

that

the

SEND

knobs

for the

channels

and

the

master

section

to

which

you

want

effects

applied

are

not

turned

counterclockwise.

@Make

sure

that

the

DIGITAL

REVERB

LEVEL

knob

is

not

turned

counterclockwise.

@Make

sure

that

the

faders

on

the

channels

to

which

you

want

effects

applied

are

not

lowered.

18

Anti-Feedback

Function

is

not

working.

@Make

sure

the

ANT]

FEEDBACK

ON/OFF

switch

is

not

set

to

OFF.

@Anti-Feedback

function

cannot

operate

if

Anti-Feedback

Filters

have

not

been

set

(AUTO

SET

indicator

extin-

guished).

Check

the

status

of

all

devices

(raise

the

CPM-300's

faders,

switch

on

mics,

and

so

on),

then

run

the

Anti-

Feedback

function's

Auto

Adjust

again.

Feedback

cannot

be

eliminated.

@Moving

a

microphone

after

the

Anti-Feedback

Filter

settings

are

completed

creates

the

chance

that

feedback

will

again

become

a

problem.

Run

the

Auto

Adjust

with

mics

in

the

positions

where

they

will

be

used

during

the

perfor-

mance.

@1f

extraneous

sound

is

allowed

to

enter

the

mic

during

the

Auto

Adjust

process,

the

threshold

where

feedback

begins

cannot

be

properly

detected.

@Feedback

is

supposed

to

occur

during

Auto

Adjust;

this

is

not

abnormal.

@The

AUTO

SET

indicator

goes

out

if

the

Anti-Feedback

Filters

are

not

set

(have

not

been

used),

for

example,

when

the

faders

are

lowered

during

the

Auto

Adjust

process.

When

the

AUTO

SET

indicator

goes

out,

with

feedback

no

longer

being

eliminated,

then

after

resetting

each

device

(raising

the

CPM-300's

faders,

turning

on

mic

switches,

and

so

on),

run

the

Auto

Adjust

procedure

once

more.

@The

Anti-Feedback

functions

are

effective

only

on

the

mono

Channels

1-6.

Furthermore,

the

Anti-Feedback

func-

tions

are

not

effective

on

signals

from

any

mono

Channel

1-6

that

has

been

routed

through

the

internal

digital

reverb

by

means

of

the

channel

SEND

knobs

and

MASTER

Section’s

SEND

knob.

When

Anti-Feedback

function

cannot

eliminate

feedback

while

the

internal

digital

reverb

is

in

use,

then

with

the

digital

reverb

LEVEL

knob

rotated

completely

counterclockwise

(-infinity:

no

digital

reverb

applied),

check

the

fol-

lowing.

If

feedback

is

suppressed:

The

feedback

is

caused

by

the

signal

sent

to

the

internal

digital

reverb.

The

Anti-Feedback

function

is

not

applied

to

this

signal.

Lower

the

send

levels

somewhat

with

the

mono

Channel

1-6

SEND

knobs

and

the

MAS-

TER

SEND

knob,

and

rotate

the

digital

reverb

LEVEL

knob

completely

counterclockwise

(no

digital

reverb

applied)

to

prevent

feedback

from

occurring.

If

feedback

is

not

suppressed:

This

feedback

cannot

be

removed

with

Anti-Feedback

function.

After

redoing

the

settings

for

each

device,

run

the

Auto

Adjust

Function

once

more.

@in

some

cases,

due

to

certain

device

conditions

and

settings,

feedback

may

not

be

completely

eliminated.

The

signal

from

Channels

1-6

is

not

output

properly

@Switching

the

Anti

Feedback

ON/OFF

switch

to

ON

sends

the

signal

input

to

Channel

1-6

to

the

Anti

Feedback.

To

prevent

change

in

the

sound

quality

of

electronic

musical

instruments,

CD

players,

and

other

such

devices

resulting

from

application

of

the

Anti-Feedback

function,

connect

devices

other

than

microphones

to

Channels

7-8

and

9-10.

Oscillation

in

the

sound

occurs

during

recording.

@

Returning

the

output

of

the

recording

device

while

recording

may

cause

unwanted

oscillations

in

the

sound.

During

recording,

completely

lower

(set

to

infinity)

the

fader

for

the

input

channel

connected

to

the

output

of

the

recording

device.

19

Specifications

1.

Mixer

Section

@Frequency

Responce:

20

Hz-—20

kHz

-2/+1

dB

(Sens

:

min}

@Total

Harmonic

Distortion:

0.1%

or

less

(sens

;

min,

20

H7—20

kHz,

rated

output)

@®Noise

Level:

{Input

150

W

terminated,

IHF-A

Weighted

typ.)

@

Equivalent

input

Noise

Level:

-120

dBm

@

Residual

Noise:

-89

dBm

(all

fader

:

min)

-72

dBm

(master

fader

:

max)

{all

channel

fader

:

min)

-72

dBm

(master

fader

:

max)

{all

channel

fader

:

nominal)

(all

sens

:

min)

-72

dBm

(master

fader

:

max)

(all

channel

fader

:

nominal)

(all

sens

:

max)

@Crosstalk:

~70

dB

or

less

(1

kHz

between

channels)

-60

dB

or

less

(1

kHz

between

L

and

R)

@£qualizer:

HIGH

EQ:

+15

dB

(10

kHz

shelving

type)

LOW

EQ:

+15

dB

(100

Hz

shelving

type)

@Digital

Reverb:

Sampling

Frequency:

48

kHz

Signal

Processing:

24

bits

2.

Power

Amplifier

Section

@Rated

Output:

100

W

x

2

(Stereo,

both

channels

8 W

loaded,

20

Hz—20

kHz,

0.1

%

or

less

THD)

150

W

x

2

(Stereo,

both

channels

4 W

loaded,

20

Hz—20

kHz,

0.1

%

or

less

THD)

@Recommended

Load

Impedance:

4

Q

or

greater

(STEREO)

@Frequency

Response:

20

Hz—20

kHz

(+1

dB

1W/8W)

@Total

Harmonic

Distortion:

0.05

%

or

less

(Stereo,

both

channels

8

W

loaded,

1

kHz,

50

Ww)

@S/N

Ratio:

100

dB

or

greater

(amp

in

150

W

terminated,

IHF-A

Weighted)

20

3.

Others

@Power:

AC

117/230/240

V

(50/60

Hz)

@Power

Consumption:

150

W

{AC

117/230/240

V)

@Dimensions:

375

(W)

x

307

(D)

x

131

(H)

mm

14-13/16

(W)

x

12-1/8

(D)

x

5-3/16

(H)

inches

@Weight:

6.0

kg

/

13

lb

40z

@Accessories:

Owner's

Manual

*

0

dBm

=

0.775

Vrms

*

In

the

interest

of

product

improvement,

the

specifications

and/or

appearance

of

this

unit

are

subject

to

change

without

prior

notice.

Roland CPM-300 User manual

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