Toa A-903MK2 Operating Instructions Manual Download Page 6 | Manualshive

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Toa A-903MK2 Operating Instructions Manual Download Page 6

AUX
OUT

PRE
AMP
IN

PRE
AMP
OUT

REMT

VOL

MUTE

1

MUTE

2

BRG
IN/
OUT

70V

25V

COM

DIRECT

4Ω

8Ω

AUX
OUT

PRE
AMP
IN

PRE
AMP
OUT

REMT

VOL

MUTE

1

MUTE

2

BRG
IN/
OUT

70V

25V

COM

DIRECT

4Ω

8Ω

13 14

15

17

18

19

20

21

22

23

A-906MK2
A-912MK2

13 14

15 16

16

17

18

19

20

21

22

23

A-903MK2

[Rear]

6

SIGNAL

NORMAL

PROTECT

PEAK

POWER

ON

OFF

MASTER

INPUT 8

INPUT 7

INPUT 6

INPUT 5

INPUT 4

INPUT 3

INPUT 2

INPUT 1

TREBLE

TONE DEFEAT

OFF

ON

BASS

LOW CUT

OFF

ON

2

1

3

4

5

6

7

8

9

10

11

12

A-903MK2
A-906MK2
A-912MK2

5. NOMENCLATURE AND FUNCTIONS

[Front]

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Summary of Contents for A-903MK2

Page 1: ...llow the instructions in this manual to ensure long trouble free use of your equipment This figure represents the A 903MK2 TABLE OF CONTENTS 1 IMPORTANT SAFETY INSTRUCTIONS 2 2 SAFETY PRECAUTIONS 3 3 GENERAL DESCRIPTION 5 4 FEATURES 5 5 NOMENCLATURE AND FUNCTIONS 6 6 INSTALLATION AND CONNECTIONS 6 1 Module Installation 8 6 2 Speaker Connections 9 6 3 Remote Control Connections 11 7 RACK MOUNTING B...

Page 2: ...instructions pour référence ultérieure Respecter tous les avertissements Suivre toutes les instructions Ne pas utiliser cet appareil à proximité d eau Nettoyer uniquement à l aide d un chiffon sec Ne pas obstruer les orifices de ventilation Installer conformément aux instructions du fabricant Ne pas installer à proximité de sources de chaleur telles que des radiateurs des registres thermiques des ...

Page 3: ...e earthing connection L appareil doit être branché à une prise d alimentation avec mise à la terre de protection The socket outlet shall be installed near the equipment and the plug shall be easily accessible Use the optional Rack mounting bracket MB 25B when mounting the unit in an equipment rack Remove four M4 x 8 screws on both sides of the unit and mount the bracket there using the M4 x 16 scr...

Page 4: ...Do not place heavy objects on the unit as this may cause it to fall or break which may result in personal injury and or property damage In addition the object itself may fall off and cause injury and or damage Make sure that the volume control is set to minimum position before power is switched on Loud noise produced at high volume when power is switched on can impair hearing Do not operate the un...

Page 5: ...0 V line or 4 Ω or 8 Ω speaker systems Each Mixer Power Amplifier can be mounted in an EIA equipment rack with the addition of the optional MB 25B Rack Mounting Bracket The optional perforated panel PF 511 provides suitable ventilation finished in black color to match the Mixer Power Amplifiers 4 FEATURES Plug in modular construction A wide frequency response of 20 to 20 000 Hz 1 dB Low distortion...

Page 6: ... COM DIRECT 4Ω 8Ω 13 14 15 17 18 19 20 21 22 23 A 906MK2 A 912MK2 13 14 15 16 16 17 18 19 20 21 22 23 A 903MK2 Rear 6 SIGNAL NORMAL PROTECT PEAK POWER ON OFF MASTER INPUT 8 INPUT 7 INPUT 6 INPUT 5 INPUT 4 INPUT 3 INPUT 2 INPUT 1 TREBLE TONE DEFEAT OFF ON BASS LOW CUT OFF ON 2 1 3 4 5 6 7 8 9 10 11 12 A 903MK2 A 906MK2 A 912MK2 5 NOMENCLATURE AND FUNCTIONS Front ...

Page 7: ...h DIRECT Placing the switch in the DIRECT position enables only unbalanced low impedance speaker connection Placing it in another position enables transformer balanced 25 V 70 V or low impedance speaker connection For the use of this switch refer to p 9 Speaker Connections 16 Speaker output terminals Connect speaker cables to these terminals 17 Remote volume control terminal REMT VOL Connecting a ...

Page 8: ...ng them along the upper and lower guide rails then secure each with two screws Be sure to cover idle slots with the blank panels attached to the unit Important Be sure to switch off the unit s power when inserting or removing the module Failure to do so may cause the module to fail AUX OUT PRE AMP IN PRE AMP OUT BRG IN OUT Amplifier 900 Series module option or Blank panel accessory Machine screw M...

Page 9: ...m the end of the speaker cable as shown in the figure at right Step 3 Connect speaker cables to the speaker output terminals Step 4 Replace the terminal cover 10 mm 0 39 Connection of speaker cable Impedance selector switch setting Step 1 Loosen the screw Step 2 Shift the impedance selector switch to 4 Ω position Step 3 Retighten the screw Low cut switch on the front panel setting It is highly rec...

Page 10: ... DIRECT 4Ω 8Ω 70V 25V COM 8 Ω 25 V line A 906MK2 10 4 Ω A 912MK2 5 2 Ω 1 3 70 V line A 906MK2 83 Ω A 912MK2 41 Ω Impedance selector switch 2 Impedance selector switch setting Step 1 Loosen the screw Step 2 Shift the impedance selector switch to 8 Ω position Step 3 Retighten the screw It is highly recommended that the low cut switch be placed in the ON position to cut off unnecessary low frequency ...

Page 11: ...nction activated on the MUTE 1 bus Likewise short circuiting between MUTE 2 and GND terminals mutes such modules on the MUTE 2 bus In this case the modules set for mute send function are not muted having precedence over mute receive modules For details refer to the module s instruction manual 6 3 2 Remote volume control connection The connected potentiometer serves as the remote control of the Mas...

Page 12: ...nel PF 511 1 unit size TO NE DE FE AT OF F ON LO W CU T OF F ON SIG NA L NO RM AL PR OT EC T ON OF F PE AK PO WE R MA ST ER INP UT 8 INP UT 7 INP UT 6 INP UT 5 INP UT 4 INP UT 3 INP UT 2 TR EB LE INP UT 1 BA SS TO NE DE FE AT OF F ON LO W CU T OF F ON SIG NA L NO RM AL PR OT EC T ON OF F PE AK PO WE R MA ST ER INP UT 8 INP UT 7 INP UT 6 INP UT 5 INP UT 4 INP UT 3 INP UT 2 TR EB LE INP UT 1 BA SS R...

Page 13: ...el Turn the knobs clockwise to increase the output level and counterclockwise to decrease it For normal music playing or announcement adjust the input level so that the Normal Indicator intermittently lights Sound quality is downgraded when the Peak Indicator remains lit Step 3 Adjust the Bass and Treble controls Set the Tone Defeat Switch to the OFF position to activate the Bass and Treble contro...

Page 14: ...OWER ON OFF MASTER INPUT 8 INPUT 7 INPUT 6 INPUT 5 INPUT 4 INPUT 3 INPUT 2 INPUT 1 TREBLE TONE DEFEAT OFF ON BASS LOW CUT OFF ON INPUT 8 INPUT 7 INPUT 6 INPUT 5 INPUT 4 INPUT 3 INPUT 2 INPUT 1 280 11 02 17 0 67 318 12 52 Unit mm inches Unit mm inches 76 2 3 88 4 3 48 99 1 3 9 466 18 35 420 16 54 482 6 19 466 18 35 420 16 54 482 6 19 320 12 6 17 0 67 358 14 09 76 2 3 88 4 3 48 99 1 3 9 14 10 DIMENS...

Page 15: ...N Power amplifier only 105 dB Tone defeat switch ON Bass 10 dB at 100 Hz Treble 10 dB at 10 kHz 8 Input gain control 1 Master gain control 1 Bass control 1 Treble control 1 Power ON OFF switch 1 Tone defeat switch 1 Low cut switch 60 Hz 6 dB octave 1 Power LED 1 Protect LED 1 Signal LED 1 Normal LED 1 Peak LED Self protection with AC fuse inside Input 1 to 8 card edge connector Bridging Mixer prea...

Page 16: ...one defeat switch ON Power amplifier only 105 dB Tone defeat switch ON Bass 10 dB at 100 Hz Treble 10 dB at 10 kHz 8 Input gain control 1 Master gain control 1 Bass control 1 Treble control 1 Power ON OFF switch 1 Tone defeat switch 1 Low cut switch 60 Hz 6 dB octave 1 Power LED 1 Protect LED 1 Signal LED 1 Normal LED 1 Peak LED Self protection with AC fuse inside Input 1 to 8 card edge connector ...

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