Yamaha Q2031B User manual

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YAMAHA

GRAPHIC

EQUALIZER

EGALISEUR

GRAPHIQUE

GRAPHISCHER

EQUALIZER

ECUALIZADOR

GRAFICO

Q2031B

GQ1031C

GQ2015A

OPERATION

MANUAL

MANUEL

D'INSTRUCTIONS

BEDIENUNGSANLEITUNG

MANUAL

DE

INSTRUCCIONES

PRECAUTIONS

1.

Avoid

Excessive

Heat,

Humidity,

Dust

and

Vibration

Keep

the

unit

away

from

locations

where

it

is

likely

to

be

exposed

to

high

temperatures

or

humidity

—

such

as

near

radiators,

stoves,

etc.

Also

avoid

locations

which

are

subject

to

excessive

dust

accumulation

or

vibration

which

could

cause

mechanical

damage.

2.

Avoid

Physical

Shocks

strong

physical

shocks

to

the

unit

can

cause

damage.

Handle

it

with

care.

3.

Do

Not

Open

The

Case

Or

Attempt

Repairs

Or

Modifications

Yourself

This

product

contains

no

user-serviceable

parts.

Refer

all

maintenance

to

qualified

Yamaha

service

personnel.

Open¬

ing

the

case

and/or

tampering

with

the

interna!

circuitry

will

void

the

warranty.

4.

Make

Sure

Power

Is

Off

Before

Making

Or

Removing

Connections

Always

turn

the

power

OFF

prior

to

connecting

or

discon¬

necting

cables.

This

is

important

to

prevent

damage

to

the

unit

itself

as

well

as

other

connected

equipment.

5.

Handie

Cables

Carefully

Always

plug

and

unplug

cables

™

including

the

AC

cord

—

by

gripping

the

connector,

not

the

cord.

6.

Clean

With

a

Soft

Dry

Cloth

Never

use

solvents

such

as

benzine

or

thinner

to

clean

the

unit.

Wipe

clean

with

a

soft,

dry

cloth.

7.

Always

Use

the

Correct

Power

Supply

Make

sure

that

the

power

supply

voltage

specified

on

the

rear

panel

matches

your

local

AC

mains

supply.

Also

make

sure

that

the

AC

mains

supply

can

deliver

more

than

enough

current

to

handle

all

equipment

used

in

your

system.

IMPORTANT

NOTICE

FOR

THE

UNITED

KINGDOM

Connecting

the

Plug

and

Cord

IMPORTANT.

The

wires

in

this

mains

lead

are

coloured

in

accordance

with

the

fol¬

lowing

code:

BLUE

:NEUTRAL

BROWN

:L1VE

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

follows:

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

letter

L

or

coloured

RED.

Making

sure

that

neither

core

is

connected

to

the

earth

terminal

of

the

three

pin

plug.

*

This

applies

only

to

products

distributed

by

YAMAHA

-

KEMBLE

MUSIC

(U.K.)

LTD.

FEATURES

•

The

two-channel

system

offers

completely

independent

chan¬

nel

control

—

from

the

input

all

the

way

to

the

output.

(Q2031B,

GQ2015A)

•

The

Q2031B/GQ1031C

offers

a

narrow,

1/3-octave

bandwidth

and

31-band

control

over

the

entire

20

Hz

to

20

kHz

range

for

very

precise

equalization.

•

The

lU-size

GQ2015A

offers

15-band

control

on

two

inde¬

pendent

channels.

•

Equipped

with

an

EQ

switch

that

bypasses

the

equalizer

sec¬

tion,

a

RANGE.switch

that

changes

the

equalization

range

and

a

host

of

other

features

the

equalizer

presents

itself

as

a

unit

carefully

designed

from

both

functional

and

operational

perspectives.

•

The

Q2031B

features

a

high

pass

filter

that

allows

setting

the

rolloff

frequency

using

a

slider,

and

the

GQ1031C/GQ2015A

is

equipped

with

an

80

Hz

high

pass

filter.

•

Equipped

with

transformerless

balanced

XLR-type

and

phone

jack

input

and

output

connectors.

•

Suitable

for

PA

and

recording

applications

and

a

variety

of

other

uses.

•

Can

be

mounted

in

a

standard

19"

rack.

CONTENTS

FRONT

PANEL.

3

REAR

PANEL.5

TYPICAL

CONFIGURATIONS.

6

ACOUSTIC

CONTROL

.

7

SPECIFICATIONS..8

BLOCK

DIAGRAM.9

DIMENSIONS.

.

.

.

9

FRONT

PANEL

Q2031B

9

0

00

O

FWISE

Q

adB

H

jmi

|

|

o

J

H

YAMAHA

•

O

JQ2031B

o

6

^

GQ1031C

GQ2015A

FRONT

PANEL

O

POWER

switch

When

this

switch

is

pressed

to

turn

the

power

on,

the

POWER

indicator

LED

above

the

switch

will

iight.

*

To

prevent

click

noise,

the

output

is

muted

for

approximately

two

seconds

after

the

power*is

turned

on.

O

RANGE

switch

Allows

selection

of

the

boost

or

cut

range

for

equalization.

When

this

switch

is

off,

the

maximum

range

of

+/-12

dB

is

selected;

when

on,

the

+/-6

dB

range

is

selected.

Use

this

switch

to

select

the

range

suitable

for

each

application.

When

the

switch

is

on,

the

LED

indicator

to

its

left

lights

to

show

that

the

+/-6

dB

range

is

in

effect.

OHPF

switch

(Q2031B)

/SO^

switch

(GQ1031C/GQ2015A)

Allows

switching

the

high

pass

filter

in

or

out

of

the

audio

path.

When

the

switch

is

on,

the

high

pass

filter

is

effective

and

the

indicator

LED

lights.

The

Q2031B

provides

12

dB

per

octave

rolloff

below

the

frequency

set

with

the

HPF

con¬

trol

0,

while

on

the

GQ1031C/GQ2015Athe

rolloff

is

12

dB

per

cotave

below

80

Hz.

When

the

switch

is

off,

the

input

signal

goes

directly

to

the

equalizer

section,

bypassing

the

HPF.

On

the

GQ2015A

the

/so^

switch

turns

the

HPF

on/off

for

channels

A

and

B

simultaneously.

o

EQ

switch

This

switch

determines

whether

the

signal

is

routed

through

or

bypasses

the

equalizer

section.

When

the

switch

is

off,

the

equalizer

is

bypassed

and

the

settings

of

the

equalizer

controls

O

are

ineffective,

providing

a

flat

frequency

re¬

sponse.

When

the

switch

is

on,

its

indicator

lights

and

the

equalizer

is

switched

into

the

audio

path.

The

equalized

sig¬

nal

can

be

compared

with

the

un-equalized

signal

simply

by

alternately

turning

the

EQ

switch

on

and

off.

0

LEVEL

control

Allows

precise

control

of

the

optimum

input

sensitivity.

When

the

control

Is

at

the

top

of

the

scale,

the

input

level

remains

unchanged

(+4

dB).

This

control

can

be

used

to

restore

the

output

level

when

the

overall

level

has

been

changed

during

the

equalization

pro¬

cess.

This,

however,

will

also

change

the

input

level.

Equal¬

ization

methods

which

do

not

change

the

LEVEL

control

set¬

ting

will

yield

a

better

signal-to-noise

ratio

and

wider

dynamic

range.

Example:

The

settings

in

Fig.

A

will

provide

a

better

result

than

the

settings

in

Fig.

B.

•

Boost/cut

settings

centered

around

the

0

dB

point

lamH

m

Fig.

A

•

Boost/cut

settings

off

the

0

dB

point

Hg.B

@HPF

control

(Q2031B)

The

HPF

control

sets

the

rolloff

frequency

for

the

built-in

high

pass

filter.

The

control

allows

continuous

adjustment

over

the

range

of

20

Hz

to

200

Hz.

Below

the

selected

frequency

there

will

be

a

12

dB

per

octave

cut.

The

filter

is

turned

on/off

using

the

HPF

switch

0.

The

HPF

can

be

adjusted

to

eliminate

low-range

standing

waves,

a

resonance

phenomenon

that

sometimes

occurs

in

small

indoor

environments,

vocal

"pops”

and

wind

noise

in

microphones

and

AC

hum.

3

FRONT

PANEL

O

Equalizer

controls

Q2031B/GQ1031C:

The

20

Hz

to

20

kHz

spectrum

is

divided

into

31

bands

(1/3

octave

steps),

and

each

of

these

bands

is

equipped

with

an

equaiizer

control

that

aiiows

boosting/cutting

the

corresponding

center

frequency.

GQ2015A

:

The

25

Hz

to

16

kHz

spectrum

is

divided

into

15

bands

(2/3

octave

steps),

and

each

of

these

bands

is

equipped

with

an

equalizer

control

that

allows

boosting/cutting

the

corresponding

center

frequency.

The

scales

on

either

side

of

the

controls

are

calibrated

to

indicate

the

correct

setting

values

when

the

RANGE

switch

is

off

(+/-12

dB

range).

When

the

RANGE

switch

is

on

(+/'6

dB

range),

the

true

values

are

one-half

of

the

calibrated

values.

Q2031B,

GQ1031C

10

100

Ik

10k

30k

Frequency

[Hz]

To

get

the

best

performance

from

your

equalizer,

it

is

important

that

you

understand

the

frequency

components

that

make

up

the

sounds

of

each

musical

instrument.

The

following

graph

is

pro¬

vided

to

aid

this

understanding.

You

should

also

bear

in

mind,

that

besides

fundamental

frequen¬

cies

harmonics

also

can

have

a

significant

impact

on

timbre.

FREQUENCY

(Hz)

10

100

Ik

10k

30k

Frequency

[Hz]

O

SIGNAL

and

PEAK

indicators

This

SIGNAL

indicator

LED

lights

up

when

the

output

signal

level

is

within

13

dB

below

nominal

level.

The

indicator

con¬

firms

that

the

current

signal

level

settings

are

suitable.

The

PEAK

indicator

LED

lights

up

when

the

output

signal

level

reaches

3

dB

below

clipping

level.

If

the

PEAK

indica¬

tor

LED

lights

continuously,

the

overall

level

is

too

high

and

must

be

reduced

using

one

of

the

two

following

methods:

(1)

By

reducing

the

overall

level

with

the

LEVEL

control

(2)

By

reducing

the

levels

of

each

equalizer

band

4

REAR

PANEL

GQ2015A

O

INPUT

connectors

The

equalizer

is

equipped

with

baianced

XLR-type

and

1/4"

phone

jack

input

connectors.

For

both

a

600

Q

line

shouid

be

used.

The

rated

input

level

is

+4

dB.

•

XLR-3-31

type

connector

Pin

1

:

Ground

O

OUTPUT

connectors

The

equaiizer

is

equipped

with

balanced

XLR-type

and

1/4"

phone

jack

output

connectors.

For

both

a

line

with

the

match¬

ing

load

impedance

of

600

Q

should

be

used.

The

rated

out¬

put

level

is

+4

dB.

•

XLR-3-32

type

connector

Pin

2

:

Hot

{+)

•

TRS

phone

connector

Sleeve:

Ground

Ring:

Cold

(-)

Tip:

Hot

{+)

TYPICAL

CONFIGURATIONS

•

Insertion

between

the

channel

(master)

insert

out/in

Q2031B

GQ1031CX2

•

insertion

in

the

main

line

of

the

output

system

POWER

AMP

6

ACOUSTIC

CONTROL

The

diagrams

show

the

connection

method

for

the

Q2031B.

The

GQ2015A

is

connected

in

the

same

way.

In

case

of

the

GQ1031C

you

will

need

two

units

for

a

two-channel

setup.

Maintaining

Ideal

Indoor

Propagation

Characteristics

Speaker

systems

that

demonstrate

flat

responses

in

anechoic

rooms

may

have

irregular

responses

in

a

concert

hall

due

to

acoustic

conditions.

The

Q2031B

equalizer

can

be

used

to

minimize

these

irregularities.

For

smoothing

of

the

playback

system

response

a

pink

noise

generator

and

a

spectrum

analyzer

are

needed.

Connect

the

noise

is

radiated

from

the

speaker.

While

measuring

the

pink

noise

at

strategic

listening

positions

in

the

room

using

the

spectrum

analyzer,

adjust

the

Q2031B

until

the

preferred

response

is

obtained.

POWER

AMP

SPEAKER

-OH

1

SPECTRUM

ANALYZER

•

Ensuring

Adequate

Feedback

Margins

in

Stage

Monitor

Systems

Depending

on

the

room

characteristics

feedback

can

result

in

howling

or

ringing

being

generated

at

specific

frequen¬

cies.

In

such

cases

the

equalizer

can

be

used

to

reduce

lev¬

els

at

the

affected

frequencies

and

thereby

to

control

the

feedback,

but

a

pink

noise

generator

and

a

spectrum

ana¬

lyzer

are

again

required.

Set

the

equipment

up

just

as

for

an

actual

performance,

and

connect

the

pink

noise

generator

to

a

spare

input

connector

of

the

mixing

console

and

the

spectrum

analyzer

to

a

spare

output

connector.

After

ensuring

that

pink

noise

is

being

prop¬

erly

radiated

from

all

PA

speakers

and

monitor

speakers,

gradually

raise

the

output

level

until

it

is

evident

at

which

frequencies

feedback

will

occur.

Use

the

Q2031B

to

reduce

the

levels

of

these

specific

frequencies.

Proper

adjustment

will

provide

a

safety

margin

against

feed¬

back

when

the

output

level

is

raised.

NOTE

:

Measuring

instruments

can

only

provide

basic

sound

realism.

After

you

have

completed

the

indoor

propaga¬

tion

and

feedback

compensation

adjustments,

make

the

final

adjustments

using

the

ultimate

judge,

vour

trained

ears.

A

Pink

Noise

Generator

generates

a

uniform

level

of

random

noise

throughout

the

audio

spectrum.

(Equal

Energy

per

octave)

A

Spectrum

Analyzer

divides

the

audio

spectrum

into

ranges

and

indicates

the

sound

pressure

for

each

range.

POWER

AMP

SPEAKER

7

SPECIFICATIONS

Q2031B

GQ1031C

GQ2015A

FREQUENCY

RESPONSE

20

Hz

~

20

kHz

±0.5dB

@

+4dB*

600Q

TOTAL

HARMONIC

DISTORTION

Less

than

0.05%

(THD+N),

20

Hz

~

20

kHz

@

+4

dB*

600^2,

Equalizer...all

flat

(OdB)

HUM

&

NOISE

(Average,

Rs=600£2

BPF

:

20Hz

-

20kHz)

-96

dB*

I

-94

dB*

|

-96

dB*

Equalizer

...

all

flat

(0

dB),

Input

Level

...

Max.

MAXIMUM

VOLTAGE

GAIN

0

dB,

Input

Level

...

Max.

EQUALIZER

CONTROLS

Center

Frequencies:

31

band

(1/3

octave)

20,

25,

31.5,

40,

50,

63,

80,

100,

125,160,

200,

250,

315,

400,500,

630,

800,1

k,

1.25k,

1.6k,

2k,

2.5k,

3.15k,

4k,

5k,

6.3k,

8k,

10k,

12.5k,

16k,

20kHz

15

band

(2/3

octave)

25,40,63,100,160,

250,

400,

630,

Ik,

1.6k,

2.5k,

4k,

6.3k,

10k,

16kHz

Variable

Range:

±12dB/±6dB

HIGH

PASS

FILTER

(Rolloff

Frequency)

12dB/octave

(20'-200Hz

at-3dB

point.)

12dB/octave

(80Hz

at

-3dB

point.)

PEAK

LED

INDICATOR

Red

LED

on

each

channel

turns

on

when

post-EQ

signal

reaches

the

level

3

dB

below

clipping.

SIGNAL

LED

INDICATOR

Green

LED

on

each

channel

turns

on

when

post-EQ

signal

reaches

the

level

13

dB

below

nominal

level.

POWER

REQUIREMENTS

U.

S.

&

Canadian

Models

:

AC120V,

60Hz

General

Model

:

AC230V,

50Hz

POWER

CONSUMPTION

20W

13W

15W

DIMENSIONS

(W

X

H

X

D)

480

X

93.4

X

230mm

480

X

49.4

X

230mm

WEIGHT

4.0kg

2.8kg

3.0kg

*

0

dB

is

referenced

to

0.775V

RMS.

•

INPUT

SPECIFICATIONS

INPUT

Connectors

Input

Impedance

Source

Impedance

Input

Level

Connectors

**

Sensitivity

*

Nominal

Level

Maximum

Before

Clipping

INPUT

(A,

B)

15

kQ

600

Q

Lines

+4

dB

(1.23V)

+4

dB

(1.23V)

+24

dB

(12.3V)

XLR-3-31

Type

Phone

Jack

(TRS)

•

OUTPUT

SPECIFICAT

IONS

OUTPUT

Connectors

Output

Impedance

Load

Impedance

Output

Level

Nominal

Level

Maximum

Before

Clipping

Connectors

OUTPUT

(A,

B)

150

Q

600

Q

Lines

+4

dB

(1.23V)

+24

dB

(12.3V)

XLR-3-32

Type

Phone

Jack

(TRS)

*

The

input

level

required

to

obtain

the

nominal

output

level.

**

XLR“type

connectors

are

balanced.

1=Ground,

2=+,

3=-

Phone

jacks

are

balanced.

T=+,

R=-,

S=Ground

•

Specifications

subject

to

change

without

notice.

8