MIXING CONSOLE

Owners Manual
Keep This Manual For Future Reference.
WARNING: THIS APPARATUS MUST BE EARTHED

IMPORTANT

THE WIRES IN THIS MAINS LEAD ARE COLOURED IN ACCORDANCE WITH THE FOLLOWING CODE: GREEN-AND-YELLOW : BLUE : BROWN : EARTH NEUTRAL 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.

Precautions

Warnings
Do not allow water to enter this unit or allow the unit to become wet. Fire or electrical shock may result. Connect this units power cord only to an AC outlet of the type stated in this Owners Manual or as marked on the unit. Failure to do so is a re and electrical shock hazard. Do not scratch, bend, twist, pull, or heat the power cord. A damaged power cord is a re and electrical shock hazard. Do not place heavy objects, including this unit, on top of the power cord. A damaged power cord is a re and electrical shock hazard. In particular, be careful not to place heavy objects on a power cord covered by a carpet. If you notice any abnormality, such as smoke, odor, or noise, or if a foreign object or liquid gets inside the unit, turn it off immediately. Remove the power cord from the AC outlet. Consult your dealer for repair. Using the unit in this condition is a re and electrical shock hazard. Should this unit be dropped or the cabinet be damaged, turn the power switch off, remove the power plug from the AC outlet, and contact your dealer. If you continue using the unit without heeding this instruction, re or electrical shock may result. If the power cord is damaged (i.e., cut or a bare wire is exposed), ask your dealer for a replacement. Using the unit with a damaged power cord is a re and electrical shock hazard. Do not remove the units cover. You could receive an electrical shock. If you think internal inspection, maintenance, or repair is necessary, contact your dealer. Do not modify the unit. Doing so is a re and electrical shock hazard.

Cautions

This unit has ventilation holes at the top and right side to prevent the internal temperature rising too high. Do not block them. Blocked ventilation holes are a re hazard. Hold the power cord plug when disconnecting it from an AC outlet. Never pull the cord. A damaged power cord is a potential re and electrical shock hazard. Do not touch the power plug with wet hands. Doing so is a potential electrical shock hazard.

Operating Notes

Using a mobile telephone near this unit may induce noise. If noise occurs, use the telephone away from the unit. XLR-type connectors are wired as follows: pin 1: ground, pin 2: hot (+), and pin 3: cold (). Insert TRS phone jacks are wired as follows: sleeve: ground, tip: send, and ring: return. The performance of components with moving contacts, such switches, rotary controls, faders, and connectors, deteriorates over time. The rate of deterioration depends on the operating environment and is unavoidable. Consult your dealer about replacing defective components.

Introduction

Thank you for purchasing the Yamaha GF24/12, GF16/12, or GF12/12 mixing console. These mixers provide an ample twelve outputs, and are suitable for a wide variety of applications ranging from concert sound reinforcement to installed systems. In order to take full advantage of the mixers functionality and to enjoy years of trouble-free performance, please read this manual carefully.
This owners manual assumes that you are familiar with basic operation of a mixing console and its specialized vocabulary. At points where the specications of the GF24/12, GF16/12, and GF12/12 differ, the specications of the GF16/12 and GF12/12 are given in curly brackets { }.

Features of the system

In addition to the main stereo outputs, this mixer provides six AUX outputs plus four group outputs (a total of 12 outputs). The AUX/GROUP outputs can be used not only as sends to external effect processors or to a multitrack recorder, but are also ideal for creating separate foldback mixes for each speaker and amp. The MONO OUT jack can be controlled independently from the STEREO OUT jacks. Since a monaural mix of the main output is sent from this output, it can be used to extend a PA system. All input channels provide a high-pass lter, a three-band EQ, and 60 mm faders. All input channels/AUX returns provide a PFL switch, and AUX/group/stereo output channels provide an AFL switch. You can audition input and output sources at the touch of a button. All mono input channels provide balanced XLR type and TRS phone jack connectors that accommodate a range of sources from mics to line level devices. Switchable phantom power is provided. This can supply DC +48 V power from the XLR type input connectors to condenser mics and direct boxes that require an external power supply. Two stereo input channels allow connection of line-level equipment. 1/4" phone jack and phono jack inputs can be selected by a switch. Two stereo AUX returns are provided. This allows AUX return signals to be sent to an AUX bus or GROUP bus as well as to the ST bus. These can also be used as spare line level input jacks.
An insert I/O jack is provided on each mono input channel and on the ST bus, allowing you to insert external effect processors as desired. The TAPE IN jacks and REC OUT jacks let you easily connect a master recorder for recording or playback.

Contents

Front and rear panel.. 5
Channel controls..6 Master controls..10 Connectors..17

Specifications.. 21

General specifications..21 Input specifications..22 Output specifications..22 Dimensions..23 Block/Level Diagram.24

Front and rear panel

This section explains the names and functions of each section of the GF24/12, GF16/12, and GF12/12. The functionality of these mixers is grouped into ten sections. These are the two channel control sections, seven master control sections, and the rear panel connectors. Their functions will be explained sequentially.

Front panel

20 21/22
PEAK +8 +5 +3 +20 PEAK +8 +5 +3 +20

+10 80

PEAK HIGH

STEREO

15 ++++++++++++++++15 15
PFLAFL/TAPE IN PHANTOM 3 4

MID 2 MID MID ST

AUX PRE

1 AUX RETURN 2

TAPE IN

PHANTOM +48V

METER SELECT

STEREO PFLAFL GROUP

PAN PAN

PAN L ODD R EVEN

BAL L ODD R EVEN
C-R MONITOR LEVEL ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON TO ST TO ST TO ST TO ST POST

PHONES LEVEL

PHONES

GROUP 1

GROUP 2

GROUP 3

GROUP 4

Channel controls

1. Mono input channels (page 6) 2. Stereo input channels (page 8)

Master controls

3. GROUP section (page 10) 4. AUX section (page 11) 5. STEREO/MONO section (page 12) 6. AUX RETURN section (page 13) 7. TAPE IN section (page 14) 8. Other controls/connectors (page 14) 9. Meter section (page 16)

Rear panel

Connectors (page 17)

INSERT I/O

OUT +4dB

ST INSERT I/O 0dB

AUX RETURN +4dB

(MONO)

OUT IN

ON/ OFF

GROUP OUT +4dB

1R 23L

INPUT B
21L INSERT I/O 0dB INSERT I/O 0dB INSERT I/O 0dB

AUX OUT +4dB (BALANCE)

TAPE IN 10dBV

22R INPUT INPUT INPUT

MONO OUT +4dBV

STEREO OUT +4dBV

REC OUT 10dBV

INPUT A

s Mono input channels
Here are the 20 {12, 8} mono input channels of the GF24/12 {GF16/12, GF12/12}. The input channel section processes the signal from the input jacks of the connector section, and sends the result to the GROUP buses, AUX buses, and the ST bus.

1 Pad switch

This attenuates the input signal by 26 dB. The pad is on when this switch is pressed in.

2 GAIN control

250 5K
This adjusts the input sensitivity. The range of levels that can be accommodated is 16 dB to 60 dB when the pad switch (1) is off, and +10 dB to 34 dB when the pad switch is on.

3 High pass lter switch

This is an on/off switch for the high pass lter that cuts the frequency range below 80 Hz at a slope of 12 dB/octave. The high pass lter is on when the switch is pressed in.

4 PEAK indicator

This is an indicator that detects post-EQ clipping. It will light 3 dB before clipping, indicating that the signal is near the clipping level. If this LED lights, lower the GAIN control (2).
5 EQ controls (HIGH/MID/LOW)
This is a three-band equalizer that boosts/cuts each frequency band over a 15 dB range. The center frequency and equalizer type for each band is shown below.

L ODD R EVEN

Center frequency 10 kHz 250 Hz5 kHz 100 Hz
Type shelving peaking shelving

HIGH MID

The response is at when the knob is in the w position.

6 AUX controls (16)

These knobs adjust the level at which the input channel signal is sent to the AUX buses 16. AUX controls 1 and 2 are xed at pre-fader, and AUX controls 36 can be switched between pre/post fader using the PRE switch (7). When a knob is in the position, the level is nominal.

7 PRE switches

These switches select whether the pre or post fader signal will be sent to AUX buses 36. This setting is switched in pairs: AUX 3/4 and 5/6. When the switch is pressed in, the pre-fader signal will be sent to the corresponding pair of AUX buses. When the switch is in the out (up) position, the post-fader signal will be sent.

0 Group select switches

These switches send the signal of the input channel to GROUP buses 14. When the 12 switch is on (pressed in) the signal will be sent to GROUP bus 1/2. When the 34 switch is on, the signal will be sent to GROUP bus 3/4.

A ST (stereo) switch

This switch sends the signal of the input channel to the ST bus. When this switch is on, the signal will be sent to the ST bus.

8 PAN control

This adjusts the left/right position at which the input channel signal will be sent to the ST (stereo) bus, GROUP bus 1/2, and GROUP bus 3/4.
B PFL (pre-fader listen) switch
This switch sends the pre-fader signal to the PFL/ AFL bus, allowing you to monitor it through headphones or monitor speakers. When this switch is on, the pre-fader signal of the input channel can be heard from the C-R OUT jacks and the PHONES jack, even if the ON switch (9) is off.

9 ON switch

This switches the input channel on/off. When this switch is turned off, the signal of the input channel will not be sent to the ST bus, GROUP buses, or AUX buses. However even if this switch is off, you can use the PFL switch (B) to monitor the signal from the C-R OUT jacks or the PHONES jack.

C Channel fader

This fader adjusts the input level of the input channel. The position of the channel fader will affect the level of the signal that is output from the ST bus, GROUP buses 14, and AUX buses (except when the PRE switch is on for AUX buses 36).
PHANTOM GROUP AUX PFL/AFL ST L R L R +48V PHANTOM +48V INSERT I/O 0dB PEAK ST HA 3 Stage EQ PAN 80 ON g g 26dB GAIN g f 3-4 1-2
INPUT A 1-20 {1-12} {1-8} INPUT B
AUX 1 AUX 2 AUX 3 PRE AUX 4 AUX 5 PRE PFL AUX 6
Mono input channel signal ow

s Stereo input channels

Here are the two stereo input channels provided by the GF24/12, GF16/12, and GF12/12. The INPUT 21/22 and 23/24 {13/14 and 15/16 on the GF16, and 9/10 and 11/12 on the GF12/12} jacks (6 and 0 of the connector section) are pairs of connectors that let you control a stereo signal using one input channel. If a cable is connected only to the INPUT A 21L or 23L jack {13L or 15L on the GF16/12, or 9L or 11L on the GF12/12}, the source will be controlled as a monaural signal.

1 A/B switch

This switch selects input jacks. When the switch is in the upward position ( ) the input signal of the INPUT A jack is selected (page 18, 6 of the connector section). When the switch is in the downward section ( ), the input signal of the INPUT B jack is selected (0 of the connector section).

This adjusts the input sensitivity. The range of levels that can be accommodated is +10 dB to 34 dB.
Band HIGH Center frequency 10 kHz 250 Hz 100 Hz Type shelving peaking shelving

MID LOW

These switches select whether the pre or post fader signal will be sent to AUX buses 36. This setting is switched in pairs: AUX 3/4 and 5/6. When the switch is pressed in, the pre-fader signal will be sent to the corresponding pair of AUX buses. When the switch is in the upward position, the post-fader signal will be sent.

8 BAL (balance) control

This adjusts the left/right balance at which the signal of the stereo input channel will be sent to the ST (stereo) bus, GROUP bus 1/2, and GROUP bus 3/4.
This fader adjusts the input level of the stereo input channel. The position of the channel fader will affect the level of the signal that is output from the ST bus, GROUP buses 14, and AUX buses 16 (except when the PRE switch is on for AUX buses 36).
GROUP AUX PFL/AFL ST L R L R PEAK *1,*3 (MONO) INPUT A A HA B GAIN HPF Stage EQ LOW HIGH MID ST
*2,*4 *1,*3 INPUT B *2,*4

HPF 80

3 Stage EQ 3-4
AUX 1 AUX 2 AUX 3 PRE AUX 4 AUX 5
No. GF12/12 GF16/12 *1 *2 *3 *4 9L 10R 11L 12R 13L 14R 15L 16R

GF24/12 21L

22R 23L 24R
Stereo input channel signal ow

s GROUP section

This section individually controls the output signal of GROUP buses 14. The signal that passes through the GROUP 14 output channels can be sent individually from the GROUP OUT 14 output jacks (page 20, D in the connector section), and can also be sent to the ST bus or PFL/ AFL bus by using the TO ST switch (group section 2) and AFL switch (group section 4).

L R L R L R L R

1 PAN control
This knob adjusts the left/right position when sending the signal of each GROUP bus 14 to the ST bus.
to Meter GROUP ST PFL/AFL L R L R

TO ST GROUP OUT 1

2 TO ST switch
This switch sends the signal of each GROUP bus 14 to the ST bus. When the switch is on, the signal that has passed through the PAN control (1) will be sent to the ST bus.

AFL to Meter

TO ST GROUP OUT 2

3 Group fader

This adjusts the output level of each GROUP bus 14. The position of the group fader will affect all signals that are sent from the GROUP bus to the GROUP OUT jacks, ST bus, and PFL/AFL bus.
GROUP OUT 3-4: Same as GROUP OUT 1-2
4 AFL (after-fader listen) switch
This switch sends the signal of the GROUP bus to the PFL/AFL bus. If this switch is on, the afterfader signal of the GROUP bus can be monitored in the C-R OUT jacks or the PHONES jack.

Group section signal ow

s AUX section
This section individually controls the output signals of AUX buses 16. The signal that has passed through the AUX 16 output channels can be sent individually to the AUX OUT jacks 16 (page 17, 1 in the connector section), and can also be sent to the PFL/AFL bus by using the AFL switch (2 in the AUX section).

1 AUX fader

These faders adjust the output level of AUX buses 16. The position of the AUX faders will affect the signals that are sent from the AUX bus to the AUX OUT jacks and the PFL/AFL bus.
AUX AUX OUT 1 PFL/AFL L R

AFL AUX OUT 2

2 AFL (after-fader listen) switch
This switch sends the AUX bus signal to the PFL/ AFL bus. When the switch is on, the after-fader signal of the AUX bus can be monitored in the CR OUT jacks or the PHONES jack.
AUX OUT 3-4: AUX OUT 5-6: Same as AUX OUT 1-2

AUX section signal ow

s STEREO/MONO section
This section separately controls the STEREO OUT jacks (page 17, 3 in the connector section) which are the main output of the mixer, and the MONO OUT jack (page 17, 2 in the connector section) which outputs a monaural mix of the STEREO OUT output.
1 MONO (monaural) control
This adjusts the signal level that is sent to the MONO OUT jack. The level is nominal when the control is at the position.

2 POST switch

This switches the output of the fader between the pre- and post-fader signals. When this switch is pressed in, the signal after passing through the STEREO fader (post-fader) will be sent to the MONO OUT jack. When this switch is in the upward position, the signal before passing through the STEREO fader (pre-fader) will be sent to the MONO OUT jack.

3 STEREO fader

This adjusts the level of the signal that is sent to the STEREO OUT jack. The position of the STEREO fader will affect the signals that are sent from the ST bus to the STEREO OUT jacks, the MONO OUT jack (if the POST switch 2 is on), and the PFL/AFL bus.
This switch sends the signal of the ST bus to the PFL/AFL bus. When the switch is on, the signal following the STEREO fader (the same signal as output from the STEREO OUT jacks) can be monitored from the C-R OUT jacks and the PHONES jack.

ST L R

to Meter

PFL/AFL L R

ST INSERT I/O L ST INSERT I/O R
L STEREO OUT R L PAD REC OUT R AFL

MONO OUT POST MONO

STEREO/MONO section signal ow

s AUX RETURN section

This section controls the two stereo AUX returns. By using the L and R jacks of AUX RETURN 1/2 (page 19, A in the connector section) in pairs, you can input stereo signals. If only the L jack of AUX RETURN 1/2 is connected, this can be used as a monaural AUX return. The input signal from AUX RETURN jack 1 can also be sent to GROUP bus 1/2 and AUX bus 1/2, and the input signal from AUX RETURN jack 2 can be sent to GROUP bus 3/4 and AUX bus 3/4.
1 GROUP 1/2, AUX 1/2 mix controls
These controls adjust the level at which signals from the AUX RETURN 1 jacks are sent to GROUP bus 1/2 and AUX bus 1/2. When a stereo signal is input, the signals of the L and R channels will be sent to GROUP buses 1/2 and AUX buses 1/2 respectively. When a monaural signal is input, the same signal will be sent to GROUP buses 1 and 2, and to AUX buses 1 and 2.

2 GROUP 3/4, AUX 3/4 mix controls
These controls adjust the level at which signals from the AUX RETURN 2 jacks are sent to GROUP bus 3/4 and AUX bus 3/4. When a stereo signal is input, the signals of the L and R channels will be sent to GROUP buses 3/4 and AUX buses 3/4 respectively. When a monaural signal is input, the same signal will be sent to GROUP buses 3 and 4, and to AUX buses 3 and 4.

3 ST (stereo) controls

These adjust the level at which the input signals from the AUX RETURN 1/2 jacks are sent to the ST bus. The position of the stereo control knobs does not affect the GROUP 14 and AUX 14 mix controls (1 and 2).
4 PFL (pre-fader listen) switch
These switches send the input signal from the AUX RETURN 1/2 jacks to the PFL/AFL bus. When this switch is on, the input signal from the AUX RETURN 1/2 jacks can be monitored directly from the C-R OUT jacks or the PHONES jack.
GROUP AUX ST PFL/AFL L R L R L (MONO) AUX RETURN 1 R GROUP 1 GROUP 2 AUX 1 AUX 2 ST

L (MONO) AUX RETURN 2 R

GROUP 3 GROUP 4 AUX 3 AUX 4 ST
AUX RETURN section signal ow

s TAPE IN section

This section controls the signal that is input from the TAPE IN jacks (page 17, 4 in the connector section). The input signal from the TAPE IN jacks can be sent directly from the ST bus, and can also be monitored from the C-R OUT jacks or PHONES jack.

1 ST (stereo) control

This adjusts the level at which the input signal from the TAPE IN jacks is output to the ST bus.

2 ON switch

This is an on/off switch for the signal that is sent from the TAPE IN jacks to the ST bus. Even when this switch is off, the TAPE IN switch (page 15, 3 in the other controls/connector section) can be turned on to allow monitoring of the TAPE IN input signal from the C-R OUT jacks or the PHONES jack.
s Other controls/connectors
1 PHANTOM +48 V (phantom power sup-

OFF ON

ply) switch This is the on/off switch for the +48 V phantom power supply. When this switch is on, the PHANTOM indicator (page 16, 3 in the meter bridge section) will light, and DC +48 V phantom power will be supplied to the INPUT A jacks (page 18, 7 in the connector section) of each mono input channel. Caution: When phantom power is on, connecting an unbalanced device or a device whose transformer is center-grounded may cause hum, noise, or malfunctions. If you do not require phantom power, be sure to turn this switch off.

C-R MONITOR LEVEL

2 METER SELECT switch

This selects the signal source whose level will be shown by the level meters. When the switch is down ( ) The level meters will show the output level of the GROUP buses 14.
When the switch is up ( ) The two level meters at the left will show the output level of the ST bus, and the two level meters at the right will show the output level of either the PFL/AFL bus or the TAPE IN jacks (page 17, 4 in the connector section), depending on the setting of the TAPE IN switch (3).

3 TAPE IN switch

This selects the signal that will be monitored by the C-R OUT jacks and PHONES jack: either the PFL/AFL bus, or the TAPE IN jacks.
6 PHONES (headphone) jack
A set of stereo headphones can be connected to this jack for monitoring. This jack will output the same signal as the C-R OUT jacks. The wiring of this jack is as shown in the following diagram.
Tip (hot) 1/4" TRS phone plug Ring (cold)
4 C-R MONITOR LEVEL (control room monitor level) control This adjusts the level of the signal that is sent to the C-R OUT jacks. It does not affect the output signal of the PHONES jack.
5 PHONES LEVEL (headphone) jack
This adjusts the level of the signal that is sent to the PHONES jack. It does not affect the output signal of the C-R OUT jacks.

Sleeve (ground)

from STEREO OUT L from GROUP OUT 1 from STEREO OUT R ST PFL/AFL L R L R from GROUP OUT 2

from GROUP OUT 3

from GROUP OUT 4 METER SELECT
BA TAPE IN C-R MONITOR LEVEL BA L TAPE IN R PHONES LEVEL BA ST ON BA

L C-R OUT R

Tape input and monitor output signal ow

s Meter section

This is a peak level meter that shows (according to the setting of the METER SELECT switch, page 14) the output levels of GROUP buses 14, the ST bus, and the PFL/AFL bus, and the input level of the TAPE IN jacks. The status of the mixers power supply and phantom power is also shown here.

1 Level meters

When the METER SELECT switch (page 14) is pressed inward ( ), the four level meters will show the output levels of GROUP buses 14. When the METER SELECT switch is in the upward position ( ), the two level meters at left will show the output level of the ST bus, and the two level meters at right will show either the output level of the PFL/AFL bus or the input level of the TAPE IN jacks (page 17, 4 of the connector section), depending on the setting of the TAPE IN switch (page 15, 3 of other controls/connectors).

2 POWER indicator

This indicator shows the on/off status of the mixers power supply. When the POWER switch (page 20, E in the connector section) has been pressed to turn on the power, this indicator will light.
3 PHANTOM (phantom power supply) indicator This indicator shows the on/off status of the phantom power supply. When the PHANTOM +48 V switch (page 14, 1 in other controls/connectors) has been slid to turn on the phantom power, this indicator will light.

Connectors

1 AUX OUT jacks 16
These are TRS phone output jacks (balanced) that individually output the signals of AUX buses 16. Nominal level is +4 dB. These jacks can be connected to your foldback system or to the inputs of external effect processors. The pin wiring is shown in the following diagram.

3 STEREO OUT jacks

These are XLR-3-32 type connectors (balanced) which output the main stereo signal that has passed through the STEREO fader. Nominal output level is +4 dB. The pin wiring is shown in the following diagram.

Female XLR connector

2 (hot) 3 (cold)

1 (ground)

2 MONO OUT jack
This is a XLR-3-32 type connector (balanced) which outputs a monaural mix of the main stereo output. Nominal output level is +4 dB. The pin wiring is shown in the following diagram.

4 TAPE IN connector

These are phono inputs jacks (unbalanced) for connecting external line level devices. Nominal level is 10 dBV. The pin wiring is shown in the following diagram.
2 (hot) 3 (cold) Phono plug Tip

Sleeve 1 (ground)

5 REC OUT jacks
These are phono jacks (unbalanced) that output the signal from the ST bus, with a nominal level of 10 dBV. This output signal is not affected by external effect processors connected to the ST INSERT I/O jacks (B) or by the position of the STEREO fader (page 12, 3 in the STEREO/ MONO control section). The pin wiring is shown in the following diagram.
7 INPUT A jacks 120 {112 on the GF16/12,
18 on the GF12/12} These are XLR-3-31 type input connectors (balanced) for the monaural input channels. Nominal input level is 16 dB to 60 dB when the pad switch (page 6, 1 of the monaural input channel section) is off, and +10 dB to 34 dB when the pad switch is on. When the PHANTOM +48 V switch (page 14, 1 of other controls/connectors) is on, DC +48 V phantom power is supplied to pins 2/3. The pin wiring is shown in the following diagram.

Phono plug

Sleeve Male XLR connector

1 (ground) 3 (cold)

6 INPUT A jacks 2124 {1316 on the GF16/
12, 912 on the GF12/12} These are 1/4" phone input jacks (unbalanced) for the stereo input channels, with nominal level of +10 dB to 34 dB. When using these as mono channels, insert a plug only into the 21L/23L jacks {13L/15L on the GF16/12, or 9L/11L on the GF12/12}. The pin wiring is shown in the following diagram.

2 (hot)

8 INPUT B jacks 120 {112 on the GF16/12,
18 on the GF12/12} These are TRS phone input jacks (balanced) for the monaural input channels. Nominal input level is the same as for the INPUT A jacks (7). Be aware that it is not possible to simultaneously use both the INPUT A and INPUT B jacks of the same channel. Phantom power is not supplied to the INPUT B jacks. The pin wiring is shown in the following diagram.

Tip (send) 1/4" phone plug
Sleeve (ground) Tip (hot) 1/4" TRS phone plug Ring (cold)
9 INSERT I/O jacks 120 {112 on the GF16/
12, 18 on the GF12/12} These are TRS phone input/output jacks for inserting external effect processors between the EQ and channel fader of a monaural input channel. Nominal level is 0 dB. The pin wiring is shown in the following diagram.
Tip (send) Ring (return) 1/4" TRS phone plug

To processors input

Tip (return) 1/4" phone plug
Connect to INSERT I/O jack

From processors output

0 INPUT B jacks 2124 {1316 on the GF16/
12, 912 on the GF12/12} These are phono input jacks (unbalanced) for the stereo input channels. Nominal level is the same as the INPUT A jacks (6). On the stereo input channels, you can make connections both to the INPUT A jacks (6) and the INPUT B jacks (0), and use the A/B switch (page 8, 1 in the stereo input channel section) to select whether INPUT jack A or B will be used. Be aware that in the case of the INPUT B jacks, the channel cannot be used as a mono input channel by inserting a plug only into 21L and 23L. (If only 21L or 23L are connected, the signal will be sent only to the left channel.) The pin wiring is shown in the following diagram.

A AUX RETURN jacks 1/2

These are 1/4" phone input jacks (unbalanced) for connecting the stereo output of external effect processors, etc. The nominal level is +4 dB. If inputting a monaural signal, connect a plug only to the 1L or 2L jack. The pin wiring is shown in the following diagram.

Sleeve

B ST INSERT I/O jacks
These are TRS phone input/output jacks for inserting external effect processors between the ST bus and the STEREO fader. The nominal input/output level is 0 dB. The pin wiring is shown in the following diagram.
C C-R OUT (control room monitor out) jacks
These are 1/4" phone output jacks (unbalanced) for monitoring the PFL/AFL bus or the input signal from the TAPE IN jacks (4). The nominal output level is +4 dB. The pin wiring is shown in the following diagram.

D GROUP OUT jacks 14

CH input equalization

ST input equalization
Meters CH peak indicators Phantom power Power requirement Power consumption Dimensions (WxHxD) Weight
0 dB is referenced to 0.775 Vrms.

Input specications

Input terminals Gain trim Actual load impedance For use with nominal Input level Connector SensitivitydB (38.8 V) 42 dB (6.16 mV) 60 dB (0.775 mV) 16 dB (123 mV) 12 dB (195 mV) 10 k 600 Lines 26 dBV (50.1 mV) 26 dB (38.8 mV) 0 dB (775 mV) 10 dB (245 mV) +20 dB (7.75 V) Nominal 60 dB (0.775 mV) 16 dB (123 mV) 34 dB (15.5 mV) +10 dB (2.45 V) +4 dB (1.23 V) 10 dBV (316 mV) Max. before clip 40 dB (7.75 mV) +4 dB (1.23 V) 14 dB (155 mV) +30 dB (24.5 V) +20 dB (7.75 V) +8 dBV (2.51 V) A: XLR-3-31 type2 B: Phone jack2 A: Phono jack3 B: Phone jack3 Phone jack3 Phono jack3
INPUT A, B (120, 112, 18)

MAX 3 k MIN MAX MIN

50600 Mics & 600 Lines
ST INPUT A, B (2124, 1316, 912) AUX RTN IN (1, 2) TAPE IN (L, R) CH INSERT IN (120, 112, 18) ST INSERT IN (L, R)

Phone jack (I/O)3

1. Sensitivity is the lowest level that will produce an output of +4 dB (1.23 V) or the nominal output level when the unit is set at maximum gain. (All faders and level controls are at maximum positions.) 2. Balanced. 3. Unbalanced. When dB represents a specic voltage, 0 dB is referenced to 0.775 Vrms, 0 dBV is referenced to 1 Vrms.

Output specications

Output terminals Actual source impedance For use with nominal Output level Connector Nominal Max. before clip
ST OUT (L, R) 150 MONO OUT GROUP OUT (14) AUX OUT (16) C-R OUT (L, R) REC OUT (L, R) CH INSERT OUT (120, 112, 18) ST INSERT OUT (L, R) PHONES OUT Phones 3 mW 100 mW k Lines 0 dB (775 mV) +20 dB (7.75 V) dBV (316 mV) 600 Lines +4 dB (1.23 V) +20 dB (7.75 V) +24 dB (12.3 V) +20 dB (7.75 V) +10 dBV (3.16 V) +24 dB (12.3 V)
XLR-3-32 type1 Phone jack2 Phone jack1 Phone jack2 Phono jack2

Phone jack (I/O)2

ST phone jack2
1. Balanced. 2. Unbalanced. When dB represents a specic voltage, 0 dB is referenced to 0.775 Vrms, 0 dBV is referenced 1 Vrms.
Specications are subject to change without prior notice. For European Model Purchaser/User Information specied in EN55103-1 and EN55103-2. Inrush Current: 3A Conformed Environment: E1, E2, E3 and E4

Dimensions

GF12/12

GF16/12

GF24/12

H: 157

W: GF24/12: 938 GF16/12: 701 GF12/12: 587

Unit: mm

D: 487

Block/Level Diagram

PHANTOM GROUP AUX +48V PHANTOM +48V INSERT I/O 0dB PEAK ST HA 3 Stage EQ PAN 80 ON g g 26dB GAIN g f 3-4 1-2 to ST
AUX 1 AUX 2 AUX 3 PRE AUX 4 AUX 5 PRE to PFL/AFL PFL PAN AUX 6 GROUP OUT 1 to PFL/AFL PEAK to ST ST AFL TO ST to Meter

*1,*3 (MONO) INPUT A

A HA B GAIN HPF Stage EQ LOW HIGH MID
GROUP OUT 2-4: Same as GROUP OUT 1 ON BAL 1-2

AUX 1 AUX 2 AUX 3

GF24/12 21L 22R 23L 24R
L (MONO) AUX RETURN 1 R PFL to PFL/AFL

AUX 4 AUX 5

AUX 6 AUX OUT 1 to PFL/AFL AFL
GROUP 1 GROUP 2 AUX 1 AUX 2 ST to ST
AUX OUT 2-6: Same as AUX OUT 1

to PFL/AFL

GROUP 3 GROUP 4 AUX 3 AUX 4 ST to ST
+20 dB PAD 26 dB GAIN Min (+10 dB) ST INPUT GAIN Min (+10 dB) AUX RETURN (+4 dB) 0 dB INSERT I/O (0 dB) AUX (6 dB) 10 dB PAD 0 dB GAIN Min (16 dB) Ch Fader GROUP, AUX GROUP OUT, AUX OUT (+4 dB)

+10 dB

PAD 26 dB GAIN Max (34 dB)

ST INPUT GAIN Max (30dB)

50 dB PAD 0 dB GAIN Max (60 dB)
from GROUP OUT 1 ST INSERT I/O L L ST INSERT I/O R STEREO OUT R L PAD REC OUT R AFL from GROUP OUT 3

from GROUP OUT 2

1-20 Ch Input {1-12} {1-8} Ch Input *1,*3 Ch Input *2,*4

(L) (R) POST MONO

MONO OUT

AUX RETURN 1, 2

1-20 Ch Input {1-12} {1-8} Ch Input *1,*3 Ch Input *2,*4 L R

GROUP OUT

AUX OUT

+20 dB

+10 dB STEREO OUT, MONO OUT (+4 dB) ST INSERT I/O (0 dB) TAPE IN (10 dBV) REC OUT (10 dBV) MONO 20 dB PHONES (3 mW, 40*) 10 dB C-R OUT (+4 dB) 0 dB

YAMAHA CORPORATION

V329640 RIP 32 NP Printed in Taiwan Pro Audio Division, #18/3 P.O. Box 3, Hamamatsu, 430-8651, Japan

PHANTOM GROUP AUX +48V PHANTOM +48V INSERT I/O 0dB PEAK ST HA 3 Stage EQ PAN 80 ON g g 26dB GAIN g f 3-4 1-2 ST L R to ST
INPUT A 1-20 {1-12} {1-8} INPUT B
AUX 1 AUX 2 AUX 3 PRE AUX 4 AUX 5 PRE to PFL/AFL PFL PAN AUX 6 GROUP OUT 1 to PFL/AFL PEAK to ST ST AFL ST INSERT I/O L L GROUP OUT 2-4: Same as GROUP OUT 1 HIGH ON BAL 1-2 L PAD 3-4 REC OUT R ST INSERT I/O R STEREO OUT R from GROUP OUT 3 from GROUP OUT 1 TO ST to Meter PFL/AFL L R

from GROUP OUT 2

*1,*3 (MONO) INPUT A
A HA B GAIN HPF Stage EQ LOW MID
from GROUP OUT 4 METER SELECT
*2,*4 *1,*3 INPUT B *2,*4

HPF 80

3 Stage EQ 1-20 Ch Input {1-12} {1-8} Ch Input *1,*3 Ch Input *2,*4 L R

(L) (R) POST MONO

AUX 1 AUX 2 AUX 3 from

MONO OUT

No. GF12/12 GF16/12 *1 *2 *3 *4 9L 10R 11L 12R 13L 14R 15L 16R

GF24/12 21L 22R 23L 24R

L (MONO) AUX RETURN 1 R PFL to PFL/AFL

AUX 4 AUX 5

AUX RETURN 1, 2
1-20 Ch Input {1-12} {1-8} Ch Input *1,*3 Ch Input *2,*4
AUX 6 AUX OUT 1 to PFL/AFL AFL from
GROUP 1 GROUP 2 AUX 1 AUX 2 ST to ST
GROUP OUT AUX OUT 2-6: Same as AUX OUT 1
(odd) (even) (odd) (even)

AUX OUT

BA TAPE IN C-R MONITOR LEVEL BA L

L C-R OUT R

to PFL/AFL

L (MONO) AUX RETURN 2 R

GROUP 3 GROUP 4 AUX 3 AUX 4 ST to ST

TAPE IN R

ON BA PHONES LEVEL BA PHONES
+20 dB PAD 26 dB GAIN Min (+10 dB) ST INPUT GAIN Min (+10 dB) AUX RETURN (+4 dB) 0 dB INSERT I/O (0 dB) AUX (6 dB) 10 dB PAD 0 dB GAIN Min (16 dB) Ch Fader GROUP, AUX TAPE IN (10 dBV) GROUP OUT, AUX OUT (+4 dB) ST INSERT I/O (0 dB) REC OUT (10 dBV) MONO PHONES (3 mW, 40*) STEREO OUT, MONO OUT (+4 dB) C-R OUT (+4 dB)

+20 dB

+10 dB
PAD 26 dB GAIN Max (34 dB)
30 dB ST INPUT GAIN Max (30dB) 40 dB
50 dB PAD 0 dB GAIN Max (60 dB)