TOA Electronics W-912A, W-906A User Manual

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OPERATING INSTRUCTIONS

NEW 900 SERIES

IN-WALL MIXER POWER AMPLIFIER

W-906A

W-912A

900 SERIES

WALL AMPLIFIER

 

 

 

 

 

POWER

PEAK

 

 

 

 

POWER

AC FUSE

OUTPUT FUSE

 

 

 

COMPRESSOR

ON

 

 

 

OFF

250V 3A

 

250V 6A

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

OFF

MAX

EQUALIZER

 

HIGH PASS

LOW PASS

 

 

 

 

OUT

IN

 

OFF

 

ON

OFF

 

ON

 

 

 

 

63

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12

 

 

 

 

 

 

 

12

 

 

 

 

6

 

 

 

 

 

 

 

6

 

 

 

 

0

 

 

 

 

 

 

 

0

 

 

 

 

6

 

 

 

 

 

 

 

6

 

 

 

 

12

 

 

 

 

 

 

 

12

 

 

 

 

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INPUT 1

INPUT 2

 

INPUT 3

 

INPUT 4

INPUT 5

INPUT 6

MASTER

TABLE OF CONTENTS

 

1. GENERAL DESCRIPTION ............................

2

2. FEATURES ....................................................

2

3. NOMENCLATURE AND FUNCTIONS

 

Front ..............................................................

3

Front (viewed with the front cover removed) ....

4

4. INSTALLATION AND CONNECTION ..........

5

5. SERVICING ....................................................

8

6. OPERATION ................................................

8

7. HOW TO USE VOLUME CONTROL COVER ....

9

8. OUTPUT EQ CHARACTERISTIC .............

10

9. BLOCK DIAGRAM ....................................

10

10. SPECIFICATIONS .....................................

11

Accessories ................................................

12

Please follow the instructions in this manual to obtain the optimum results from this unit. We also recommend that you keep this manual handy for future reference.

1. GENERAL DESCRIPTION

The TOA W-906A and W-912A Mixer Power Amplifiers control and mix up to six independent input signals plus two inputs with use of expanding kit. The W-906A delivers up to 60 W of output power and the W-912A 120 W. Optional accessory modules are available for use with the W-906A and W-912A to provide versatility for a wide range of operating applications. Edge connectors at the bottom of the front panel permit the selection of the TOA plug-in modules: The H-01 series, H-02 series, H-03 series, H-21 and H-22 Microphone Preamplifiers, the E-01 series and E-11 series Mag. Phono Preamplifiers, the X-01 series, X-11 series and X- 21 Auxiliary Preamplifiers for high-level sources, the B-01 series and B-11 series Bridging Transformers for bridging high-impedance lines, the L-01 series Line Matching Transformers for matching 600 Ω lines, I-01 Paging Input for combining with TOA Intercom Systems EXES-1000, EXES-5000 and EX-16, T-01 series Line Outputs for matching 600 Ω lines and the S-01, S-02 and S-03 Tone Signal Generators for generating attention-getting signals and 1 kHz sine wave for testing within the total system. Other features include a muting function. Sources fed to particular input module accessories are muted by short-circuiting at MUTE TERMINALS on the front. To perform this function, Module E-11, X-11 series or B-11 series is required. Using any of the modules H-21, H-22 and X-21 permits the input signal level to be controlled remotely by means of an external potentiometer.

The W-906A and W-912A have a built-in one-octave graphic equalizer with 9 bands to tailor sound system frequency response to room acoustics, reducing feed-back tendencies and improving intelligibility. A built-in compressor circuit is provided to protect the output level from distortion as a result of excessive input and keeps it constant. Compressor's threshold level can be adjusted.

The W-906A and W-912A Mixer Power Amplifiers have output terminals to match 4 or 8 Ω speaker systems, or speaker distribution system may be connected to the 25 or 70 V terminals. User's (blank) space is provided for additional functions to be made by the customers. The expanding kit (optional) may be loaded in this space when the number of input is increased. Protection against tampering is assured by means of a key-locked hinged door. The W-906A and W-912A can be mounted in any four-inch wall with of the BX-9F Flush Mounting Black Box. On-wall mounting is also possible with the BX-9S Surface Mounting Box.

2. FEATURES

6-channel mixer power amplifier

Expandable to 8-input

Output power: 120 W for W-912A, 60 W for W-906A

Wide frequency response: 30 to 20,000 Hz ±1dB

Low distortion and noise

Excellent output regulation

Built-in one-octave equalizer

Built-in compressor

Self-protection circuitry design

Separate output terminals: 4 and 8 Ω, 25 and 70 V

Extra space for customizing

LED pilot light

LED peak indicator

Full range of plug-in modules

Flush and surface mounting

2

3. NOMENCLATURE AND FUNCTIONS

 

 

 

 

 

 

 

 

 

 

[Front]

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

11

 

 

 

 

 

 

900 SERIES

 

 

Equalizer Section

 

 

6

 

 

7

 

8

 

 

 

 

 

 

 

WALL AMPLIFIER

 

 

 

 

 

 

 

 

 

 

 

10

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

12

 

 

 

 

 

 

 

 

 

 

 

5

 

EQUALIZER

 

HIGH PASS

 

LOW PASS

13

 

 

 

 

 

 

 

 

 

 

 

14

 

OUT

IN

 

OFF

 

ON

OFF

ON

 

 

 

 

 

 

 

 

 

 

 

 

63

125

250

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POWER

PEAK

 

 

 

12

 

 

 

 

 

 

 

12

1

POWER

AC FUSE

OUTPUT FUSE

 

 

 

COMPRESSOR

 

6

 

 

 

 

 

 

 

6

 

 

 

 

 

 

 

 

 

 

 

 

 

ON

 

 

 

 

6

 

 

 

 

 

 

 

6

 

OFF

 

250V 3A

 

250V 6A

 

 

 

 

 

 

0

 

 

 

 

 

 

 

0

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

OFF MAX

 

 

 

 

 

 

 

 

 

 

 

EQUALIZER

HIGH PASS

LOW PASS

 

 

 

 

 

 

 

 

 

 

 

 

 

 

OUT

IN

OFF

 

ON

OFF

 

ON

 

 

 

 

12

 

 

 

 

 

 

 

12

15

63

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16

 

 

 

 

 

 

 

12

 

 

 

 

 

 

 

12

 

 

 

 

 

 

 

 

 

 

 

 

 

12

 

 

 

 

 

 

 

12

 

 

 

 

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6

 

 

 

 

 

 

 

6

 

 

 

 

 

 

 

 

 

 

 

 

 

 

0

 

 

 

 

 

 

 

0

 

 

 

 

 

 

 

 

 

 

 

 

 

 

6

 

 

 

 

 

 

 

6

 

 

 

 

 

 

 

 

 

 

 

 

 

 

63

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2

INPUT 1

INPUT 2

 

INPUT 3

 

INPUT 4

INPUT 5

INPUT 6

MASTER

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

9

 

 

 

 

 

 

4

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

3

 

Equalizer Section

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1.Power switch

Applies line power. Two-position push button switch for on-off modes.

2.Input volume controls

Adjust gain of input 1 – 6 respectively.

3.Master volume controls

Adjust overall gain of unit.

4.Modules (optional)

Select appropriate modules according to the application.

5.Compressor control (limiter)

Setting the control switch to OFF position bypasses the compressor circuit and turning it clockwise will reduce the limiter level (will limit the output).

6.Equalizer switch

Place this switch in the IN position to activate an equalizer.

7.High-pass filter switch

Place this switch in the ON position to cut off unnecessary low frequency.

8.Low-pass filter switch

Place this switch in the ON position to cut off unnecessary high frequency.

9.Equalizer controls

9 band filters. 12 dB boots and cut at each center frequency.

10.Power indicator

Comes on when power is switched on.

11.Peak indicator

Comes on when the output signal reaches the rated output power level.

12.Output fuse

Prevents excessive current flow. W-906A: 250 V, 6 A W-912A: 250 V, 10 A

13.AC fuse

Prevents excessive current flow. W-906A: 250 V, 3 A W-912A: 250 V, 5 A

14.Blank panel (user's space)

The space of 103 (w) x 63 (h) x 95 (d) mm is provided. An optional expanding kit may be loaded in this space.

15.Equalizer security cover

Prevents inadvertent changes of the equalizer controls set at proper level.

16.Key-locked door

Prevents tampering.

3

[Front] (viewed with the front cover removed)

19

 

 

 

 

 

 

 

 

 

 

 

 

 

20

POWER

AC FUSE

OUTPUT FUSE

 

 

 

COMPRESSOR

 

ON

 

 

 

 

OFF

250V 3A

 

250V 6A

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

OFF

MAX

 

EQUALIZER

 

HIGH PASS

LOW PASS

 

 

 

 

 

OUT

IN

 

OFF

 

ON

OFF

 

ON

 

 

 

 

 

63

125

250

500

1k

2k

4k

8k

16k

 

 

 

 

 

12

 

 

 

 

 

 

 

12

 

 

 

 

 

6

 

 

 

 

 

 

 

6

 

 

 

 

 

0

 

 

 

 

 

 

 

0

 

 

 

 

 

6

 

 

 

 

 

 

 

6

 

 

 

 

 

12

 

 

 

 

 

 

 

12

 

 

 

 

 

63

125

250

500

1k

2k

4k

8k

16k

 

 

 

 

 

INPUT 1

INPUT 2

 

INPUT 3

 

INPUT 4

INPUT 5

INPUT 6

MASTER

 

 

 

 

 

 

 

 

 

 

 

 

 

22

21

 

 

 

 

 

 

 

 

 

 

 

 

23

 

 

 

 

 

 

 

 

 

 

 

 

 

24

18 17

Junction Box

17.

AC power cord

23.

Mute terminal

 

Connects to power source.

 

With modules employing muting function, which

 

 

 

are optionally available, the input signals fed to

18.

Speaker output terminals

 

the modules are muted by short-circuiting at this

 

Connects to speakers.

 

terminal.

19.

Output terminals

24.

Cord clamp

 

Select output impedance with this terminal.

 

Clamps off lead wires from module inputs, mute

 

 

 

terminals and bridging input/output terminals.

20.Low-cut switch

Cuts off unnecessary low frequency.

21.Module input ports

Accept PLUG-IN MODULES which are optionally available. Module selection is determined by application.

22.Bridging input/output

This terminal is used as a mixing bus. Mixing is achieved when the similar terminal of another amplifier is connected to this terminal. The output level taken from this terminal is independent of the all CONTROLS (except INPUT VOLUME CONTROLS) so that the terminal can also be used as recording output. The input impedances

of the equipment to be connected here should be more than 10 kΩ.

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