TOA Electronics W-912A, W-906A User Manual
OPERATING INSTRUCTIONS
NEW 900 SERIES
IN-WALL MIXER POWER AMPLIFIER
W-906A
W-912A
900 SERIES
WALL AMPLIFIER
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POWER |
PEAK |
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POWER |
AC FUSE |
OUTPUT FUSE |
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COMPRESSOR |
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250V 3A |
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250V 6A |
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EQUALIZER |
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INPUT 1 |
INPUT 2 |
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INPUT 3 |
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INPUT 4 |
INPUT 5 |
INPUT 6 |
MASTER |
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TABLE OF CONTENTS |
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1. GENERAL DESCRIPTION ............................ |
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2. FEATURES .................................................... |
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3. NOMENCLATURE AND FUNCTIONS |
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Front .............................................................. |
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Front (viewed with the front cover removed) .... |
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4. INSTALLATION AND CONNECTION .......... |
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5. SERVICING .................................................... |
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6. OPERATION ................................................ |
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7. HOW TO USE VOLUME CONTROL COVER .... |
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8. OUTPUT EQ CHARACTERISTIC ............. |
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9. BLOCK DIAGRAM .................................... |
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10. SPECIFICATIONS ..................................... |
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Accessories ................................................ |
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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
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3. NOMENCLATURE AND FUNCTIONS |
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[Front] |
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900 SERIES |
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Equalizer Section |
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WALL AMPLIFIER |
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EQUALIZER |
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OUT |
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POWER |
PEAK |
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POWER |
AC FUSE |
OUTPUT FUSE |
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COMPRESSOR |
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OFF MAX |
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EQUALIZER |
HIGH PASS |
LOW PASS |
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2 |
INPUT 1 |
INPUT 2 |
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INPUT 3 |
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INPUT 4 |
INPUT 5 |
INPUT 6 |
MASTER |
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3 |
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Equalizer Section |
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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.
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[Front] (viewed with the front cover removed)
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20 |
POWER |
AC FUSE |
OUTPUT FUSE |
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COMPRESSOR |
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ON |
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OFF |
250V 3A |
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250V 6A |
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OFF |
MAX |
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EQUALIZER |
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OUT |
IN |
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ON |
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INPUT 1 |
INPUT 2 |
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INPUT 3 |
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INPUT 4 |
INPUT 5 |
INPUT 6 |
MASTER |
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24 |
18 17
Junction Box
17. |
AC power cord |
23. |
Mute terminal |
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Connects to power source. |
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With modules employing muting function, which |
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are optionally available, the input signals fed to |
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Speaker output terminals |
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the modules are muted by short-circuiting at this |
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Connects to speakers. |
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19. |
Output terminals |
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Cord clamp |
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Select output impedance with this terminal. |
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Clamps off lead wires from module inputs, mute |
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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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