Yamaha Audio GA32/12 GA24/12 User Manual

E

MIXING CONSOLE

Owner’s Manual

ii

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. Ventilation

The unit has ventilation slots on the top, rear and
bottom panels. Do not block these vents.

3. Avoid physical shocks

Strong physical shocks to the unit can cause dam­age. Handle it with care.

4. 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. Opening the case and/or tampering
with the internal circuitry voids the warranty.

5. Always power off before making connec­tions

Always turn the power OFF before connecting or
disconnecting cables. This is important to pre­vent damage to the unit itself as well as other con­nected equipment.

IMPORTANT NOTICE FOR

THE UNITED KINGDOM

Connecting the Plug and Cord

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 follows:

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 or coloured 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 letter L or coloured RED.

* This applies only to products distributed by YAMAHA KEMBLE

MUSIC (U.K.) LTD.

6. Handle cables carefully

Always plug and unplug cables — including the
AC power cord — by gripping the connector, not
the cord.

7. 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.

8. 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.

Contents

Introduction .......................................1

Features..................................................................1

Front Panel .........................................2

Monaural input channels......................................2

Stereo input channels............................................4

Master Section ...................................6

Variable/Fix select section.....................................6

Mix section ............................................................6

ST (Stereo) section ................................................9

AUX RETURN section........................................10

MATRIX section..................................................11

C-R MONI (Control room monitor) section

PHONES (headphones) section .........................12

TAPE IN section..................................................13

TALKBACK section ............................................14

METER SELECT section.....................................15

Meter bridge ........................................................15

Rear Panel ........................................16

GA Diversity Function ......................19

What is GA Diversity? .........................................19

Setting the GA Diversity function ......................19

Specifications ...................................20

General specifications .........................................20

Input specifications .............................................21

Output specifications ..........................................21

Dimensions..........................................................22

Block and Level diagram.....................................23

GA32/12, GA24/12—Owner’s Manual

Introduction

Thank you for choosing the Yamaha GA32/12 or GA24/12 mixing console. Please read
this manual thoroughly to take best advantage of the console and extend its useful life.

Notes:

This manual has been written on the assumption that you already understand the basic
operation and technical terminology of mixing consoles.

Descriptions of GA24/12 specifications appear in brackets ({}) if they differ from the
GA32/12.

Features

Introduction

1

• The GA32/12 provides 28 monaural and 2 stereo
input modules {the GA24/12 provides 20 mon­aural and 2 stereo input modules}. The output
channels comprise stereo outputs, 10 mix out­puts, and two matrix outputs, and support a wide
range of applications, from SR (sound reinforce­ment) to facility acoustics.

• Each monaural input channel offers a 26 dB pad,
HPF, phase switch, 4-band EQ (HI-MID and LO­MID frequencies are variable), and a 100 mm­long full-stroke fader. Also, phantom power can
be turned on and off for every group of four
inputs.

• Four stereo AUX returns and TAPE IN jacks are
provided as standard.

• The master section of the console is located in the
center area of the unit, facilitating operation.

• The master section provides output channels for
MIX buses 1–10, with EQs and 100 mm-long
faders.

• Each input channel and four stereo AUX returns
include a PFL switch, and stereo bus, MIX buses
1–10, and Matrix 1–2 has an AFL switch,
enabling you to monitor the input/output
sources quickly.

This routing can be used as a conventional group
bus. In this way, you can configure the bus for a
specific purpose.

• The console has two independent matrixes. You
can mix MIX buses 1–4 and the stereo bus indi­vidually at the levels you desire and output them
from the MATRIX OUT 1–2 jacks. This routing
can be used as a mix for the foldback or for indi­vidual speakers and amplifiers.

• The INSERT I/O jacks are provided for all mon­aural input channels, the stereo bus, and MIX
buses 1–4. You can insert an external effect pro­cessor, if necessary.

• Talkback signals can be sent to any of MIX buses
1–4, MIX buses 5–10, and the stereo bus.

• C-R monitor output enables you to select PFL/
AFL or TAPE IN as a monitoring source.

• The console’s sturdy finish and rugged design
assure its durability even under severe conditions
and rough on-site usage.

• Using the GA Diversity function enables you to
set MIX buses 1–4 to Variable mode or Fix mode
individually. In Variable mode, you can change
the level of the signals sent out from the input
channels. This routing can be used as a conven­tional AUX bus. In Fix mode, the level of the sig­nals sent out from the input channels is fixed.

GA32/12, GA24/12—Owner’s Manual

2

Front Panel

Front Panel

26dB

GAIN

+10 –34

–60–16

PEAK

HIGH

HI-MID

LO-MID

LOW

M1

M2

M3

M4

M5

M6

M7

M8

M9

M10

PAN

ST

PRE

PRE

PRE

PFL

80

+15–15

8k400

+15–15

1.6k80

+15–15

+15–15

EQ

100

ON

100

ON

100

ON

100

ON

100

100

100

100

100

100

RL

ON

10

5

0

5

10

20

30

40

50
60

5

8

0

C

1

Monaural input channels

2

3
4

6

7

9

A

B

D

E

F

The GA32/12 {GA24/12} has 28 {20} monaural input channels. They are located on both
sides of the master section and feature the same specifications.

A

Pad switch

This switch is used to attenuate input signals by 26 dB. Press down the switch to turn the
pad on.

GAIN control

B

This control knob is used to adjust input sensitivity. The adjustable range is –16 dB to
–60 dB when the pad switch

1

is turned off, and +10 dB to –34 dB when the pad switch is

turned on.

C

Ø (Phase) switch

This switch reverses the phase of input signals. Press down this switch to reverse the phase.

D

High pass filter switch

This high pass filter is used to cut the frequency range below 80 Hz with a slope of 12 dB/
oct. Press down the switch to turn the high pass filter on.

E

PEAK indicator

This indicator lights up when the level of signals that pass the EQ reaches 3 dB below the
clipping level.

EQ controls (HIGH/HI-MID/LO-MID/LOW)

F

This 4-band equalizer provides ±15 dB of cut and boost over each range, with the center
frequencies and types shown in the following table. The frequencies for HI-MID and LO­MID are variable.

Band Center frequencies Type

HIGH 10 kHz shelving

HI-MID 400 Hz–8 kHz peaking (parametric)

LO-MID 80 Hz–1.6 kHz peaking (parametric)

LOW 100 Hz shelving

G

EQ switch

This switch is used to turn equalization on and off. Press down the switch to turn
equalization on.

H

M1–M4 mix level controls

These controls are used to route the pre fader signals from the input channel to MIX buses
1–4.

Note: When you press down the M1–M4 switches to the FIX position in the Variable/

Fix select section (see page 6), the output level of the signals routed to the MIX buses will
be fixed and the corresponding M1–M4 mix level controls will be disabled.

GA32/12, GA24/12—Owner’s Manual

Monaural input channels

ON switches

I

These switches are used to turn on and off the signals routed from the input channel to MIX
buses 1–4.

Note: When these switches are set to off, no signals will be sent from the input channel to

the corresponding MIX buses regardless of the setting of the switches in the Variable/Fix
select section (see page 6).

M5–M10 mix level controls

J

These controls route the input channel signals to MIX buses 5–10. Use the PRE switches
select pre- or post-fader.

K

PRE switches

These switches are used to select pre- or post-fader for signals sent from the input channel to
MIX buses 5–10. Each switch is effective for one pair of MIX buses: 5/6, 7/8, or 9/10. When you
turn these switches on, the pre-fader signals will be sent to the corresponding MIX bus pair.

L

PAN control

This control is used to set the stereo image of signals sent from the input channel to the ST
(stereo) buses.

K

3

to

INPUT A

1-12,
17-24/17-32

INPUT B

ST (Stereo) switch

M

When you turn this switch on, input channel signals are sent to the ST buses.

N

ON switch

This switch is used to turn on and off the corresponding input channel module. When this
switch is turned off, no signals are sent from the corresponding input channel to the ST buses
and MIX buses 1–10. However, using the PFL switch

O

will enable you to monitor the signals

via the C-R MONITOR OUT jacks or PHONES jack.

O

PFL (Pre-fader Listen) switch

When you turn this switch on, the pre-fader signals of the input channel are routed to the PFL
bus, and you are able to monitor the signals via the C-R MONITOR OUT jacks or PHONES
jack.

P

Channel fader

This fader is used to adjust the level of the input channel signals. This fader setting affects the
level of the signals routed to the ST buses, MIX buses 1–4, and MIX buses 5–8 (when the PRE
switches are turned off).

PHANTOM

PAD

26dB

+48V

HA

GAIN

HPF

INSERT I/O

MIX

PEAK

ON

ON

ON

ON

PRE

PRE

PRE

ST

80

ø

4-Stage EQ

fgf

HIGH

HI-MID

g

LOW

LO-MID

EQ

ON

(FIX)

M1

M2

M3

M4
M5
M6
M7
M8
M9
M10

PAN

4321

1234

MIX

(VARIABLE)

1098765

PFL

ST

RL

CTLRL

PFL

Signal flow of the monaural input channel

GA32/12, GA24/12—Owner’s Manual

4

Front Panel

Stereo input channels

The GA32/12 and GA24/12 provide two stereo input channel modules. Use the paired
INPUT 13/14 and 15/16 jacks (see page 17, rear panel

5

) to input stereo signals. If you
connect signals only to the 13L (MONO) jack or 15L (MONO) jack, the same signal will
be sent t the o M1–4 and ST buses.

GAIN control

A

This control is used to adjust input sensitivity. The adjustable range is +10 dB to –34 dB.

B

PEAK indicator

This indicator lights up when the level of signals that have been processed by the EQ
reaches 3 dB below the clipping level.

High pass filter switch

C

This high pass filter is used to cut the frequency range below 80 Hz with a slope of 12 dB/
oct.

2

GAIN

PEAK

HIGH

HI-MID

LO-MID

LOW

1

–34+10

3

80

+15–15

+15–15

4

+15–15

+15–15

6

8

A

M1

M2

M3

M4

M5

M6

M7

M8

M9

M10

BAL

5

EQ

D

EQ controls (HIGH/HI-MID/LO-MID/LOW)

This 4-band equalizer provides ±15 dB of cut and boost over each range, with the center

100

ON

100

ON

7

100

ON

100

ON

100

PRE

100

100

9

PRE

100

100

PRE

100

0

RL

ST

B

ON

frequencies and types shown in the following table.

Band Center frequencies Type

HIGH 10 kHz shelving

HI-MID 3 kHz peaking

LO-MID 800 Hz peaking

LOW 100 Hz shelving

E

EQ switch

This switch is used to turn the equalization on and off.

F

M1–M4 mix level controls

These controls are used to route the pre fader signals from the stereo input channel to MIX
buses 1–4. When stereo signals are input, the L channel signal will be sent to MIX buses 1,
3, and the R channel signal will be sent to MIX buses 2 and 4.

Note: When you press down the M1–M4 switches to the FIX position in the Variable/

Fix select section (see page 6), the output level of signals sent to the MIX buses will be
fixed and the corresponding M1–M4 mix level controls will be disabled.

G

ON switches (M1–M4)

These switches are used to turn on and off the signals routed from the stereo input channel
to MIX buses 1–4.

PFL

C

10

5

0

5

D

10

20

30

40

50
60

GA32/12, GA24/12—Owner’s Manual

Note: When these switches are set to off, no signals are sent from the stereo input

channel to the corresponding MIX buses regardless of the setting of the switches in the
Variable/Fix select section (see page 6).

M5–M10 mix level controls

H

These control knobs route the stereo input channel signals to MIX buses 5–10. Stereo
input signals are mixed into a monaural signal and sent to MIX buses 5–10. Use the PRE
switches

9

to select pre- or post-fader.

Stereo input channels

I PRE (Pre-fader) switches

These switches are used to select pre- or post-fader for signals sent from the stereo input
channel to MIX buses 5–10. Each switch is effective for one pair of MIX buses:5/6, 7/8, or 9/10.
When you turn these switches on, the pre-fader signals are sent to the corresponding MIX bus
pair.

J BAL (Balance) control

This control is used to adjust the left and right balance of signals sent from the stereo input
channel to the ST bus.

K ST (Stereo) switch

When you turn this switch on, the stereo input channel signals will be sent to the ST bus. If you
connect monaural signals to the 13L (MONO) jack or 15L (MONO) jack (see page 17, rear
panel 5), the same signals will be sent to both L and R channels.

L ON switch

This switch is used to turn on and off the corresponding stereo input channel. When this switch
is turned off, no signals are sent to the ST bus and MIX buses 1–10. However, using the PFL
switch M will enable you to monitor the signals via the C-R MONITOR OUT jacks or
PHONEs jack.

5

13L(MONO),
15L(MONO)

14/13,
16/15

M PFL (Pre-fader listen) switch

When you turn this switch on, the pre-fader signals of the stereo input channel are routed to
the PFL bus, and you can monitor the signals via the C-R MONITOR OUT jacks or PHONES
jack.

N Channel fader

This fader is used to adjust the level of the stereo input channel signals. This fader setting affects
the level of the signals routed to the ST bus, MIX buses 1–4, and MIX buses 5–8 (when the PRE
switches are turned off).

HA

14R,
16R

PAD

PAD

HPF

GAIN

HA

80

HPF

4-Stage EQ

HIGH

HI-MID

4-Stage EQ

LOW

LO-MID

MIX

PRE

PRE

PRE

(FIX)

M1

M2

M3

M4
M5
M6
M7
M8
M9
M10

BAL

PFL

ON

EQ

PEAK

ON

ON

ON

ON

ST

MIX

(VARIABLE)

PFL

109876512344321

ST

CTL

RL

RL

PFL

Signal flow of the stereo input channel

GA32/12, GA24/12—Owner’s Manual

6 Master Section

Master Section

Variable/Fix select section

The GA32/12 and GA24/12 feature a GA (Group/Aux) diversity function, which enables you to
use the MIX bus 1–4 signals as group bus signals or AUX bus signals. This section of the console
allows you to select whether you wish to use MIX buses 1–4 as group buses or AUX buses.

A M1–M4 switches

These switches are used to select whether the level of signals sent from the input channels to
MIX buses 1–4 will be fixed (FIX) or variable (VARIABLE).

■ When FIX is on:

The selected MIX bus(es) function as a group bus. The
level of the signal from each input channel will be fixed,

VARIABLE / FIX

FIX

and the M1–M4 mix level controls of the input channels
that correspond to the MIX buses will be disabled.

FIX

1

■ When FIX is off:

The selected MIX bus(es) function as an AUX bus. Signals
that pass through the M1–M4 mix level controls of each
input channel (see page 2, monaural input channel 8, and
page 4, stereo input channel 6) are sent to the
corresponding MIX buses.

FIX

FIX

Mix section

This section consists of the output channels that handle MIX bus 1–10 signals individually.
Signals that pass these output channels are output from MIX OUT 1–10 jacks (see page 17, rear
panel 6), and also routed to the AFL bus. MIX bus 1–4 signals are also routed to the ST bus
and Matrixes 1/2.

1

HIGH

MID

HIGH

+15–15

MID

6k300

HIGH

+15–15

MID

6k300

HIGH

+15–15

MID

6k300

HIGH

+15–15

MID

6k300

HIGH

+15–15

MID

6k300

HIGH

+15–15

MID

6k300

HIGH

+15–15

MID

6k300

HIGH

+15–15

MID

6k300

HIGH

+15–15

6k300

+15–15

MID

M1

M2

M3

M4

1

6k300

LOW

2

PAN

3

4

TO ST

5

6

GA32/12, GA24/12—Owner’s Manual

+15–15

+15–15

EQ EQ EQ EQEQ

RL

AFL

10

5

0

5

10

20

30

40
50

60

M1 M2

LOW

PAN

TO ST

+15–15

+15–15

RL

AFL

10

5

0

5

10

20

30

40
50

60

+15–15

LOW

+15–15

PAN

RL

TO ST

AFL

10

5

0

5

10

20

30

40
50

60

M3 M4

LOW

PAN

TO ST

+15–15

+15–15

RL

AFL

LOW

+15–15

+15–15

AFL

LOW

+15–15

+15–15

EQ

AFL

LOW

+15–15

+15–15

EQ

AFL

LOW

+15–15

+15–15

EQ

AFL

LOW

+15–15

+15–15

EQ

AFL

LOW

+15–15

+15–15

2

EQ

AFL

5

10

5

0

5

10

20

30

40
50

60

10

5

0

5

10

20

30

40
50

60

M5

M6

10

5

0

5

10

20

30

40
50

60

M7

10

5

0

5

10

20

30

40
50

60

M8

10

5

0

5

10

20

30

40
50

60

M9

10

5

0

5

10

20

30

40
50

60

10

5

0

5

6

10

20

30

40
50

60

M10

Mix section 7

■ M1–M4

These modules function as output channels for either a group bus or an AUX bus, depending
on the setting of the switches in the Variable/Fix select section. The MIX bus 1–4 signals that
pass these output channels can be routed to MIX OUT 1–4 jacks, ST bus, AFL bus, and
Matrixes 1/2.

■ M5–M10

These modules function as output channels for an AUX bus. The MIX bus 5–10 signals that
pass these output channels can be routed to MIX OUT 5–10 jacks and AFL bus.

A EQ controls (HIGH/MID/LOW)

This 3-band equalizer provides ±15 dB of cut and boost over each frequency range of the MIX

bus signals, with center frequencies and types shown in the following table. The frequencies for
MID are variable.

Band Center frequencies Type

HIGH 10 kHz shelving
MID 300–6 kHz peaking (parametric)
LOW 100 Hz shelving

B EQ switch

This switch is used to turn the equalization on and off.

C PAN control (applied only to M1–M4)

This control allows you to adjust the stereo position of signals routed from MIX buses 1–4 to
the ST bus.

D TO ST (To stereo) switch (applied only to M1–M4)

When you turn this switch on, the MIX bus 1–4 signals will be sent to the ST bus.

E AFL (After-Fader Listen) switch

When you turn this switch on, the post-fader signals in the MIX buses are routed to the AFL
bus, and you can monitor the signals via the C-R MONITOR OUT jacks or PHONES jack.

F Mix master fader

This fader adjusts the output level of the MIX buses. The settings of the M1–M4 faders affect the
level of signals sent to MIX OUT 1–4 jacks, ST bus, AFL bus, and Matrixes 1/2. The settings of
the M5–M10 faders affect the level of signals sent to the MIX OUT 5–10 jacks and AFL bus.

GA32/12, GA24/12—Owner’s Manual