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TOA 900 SERIES
(60-WATT)
IN-WALL AMPLIFIER
W-906A/912A
(120-WATT)
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Features
1. 6-channel mixer power amplifier
2. Expandable to 8-input
3. Output power: 120W for W-912A, 60W for W-906A
4. Wide frequency response: 30 to 20,000Hz ±1dB
5. Low distortion and noise
6. Excellent output regulation
7. Built-in one-octave equalizer
8. Built-in compressor
9. Self-protection circuitry design
10. Separate output terminals: 4 and 8 ohms, 25 and
70 volts
11. Extra space for customizing
12. LED pilot light
13. LED peak indicator
14. Full range of plug-in modules
15. Flush and surface mounting
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 an expanding kit WE-2. The W-906A delivers up to
60 watts of output power and the W-912A 120 watts. Twenty
one optional accessory modules are available to allow the
W-906A and W-912A amplifiers to be configured for a variety of
applications. Edge connectors on the rear of the units permit
TOA modules to be easily inserted for use.
Modules include the M Series microphone preamplifiers,
available with muting, remote volume control, voice gate and
compressor options. The U Series auxiliary preamplifiers,
available with muting, remote volume control and compressor
options. The B Series bridging transformers, available with
muting option, the L Series line matching transformers,
available with muting option, the S Series signal generator
modules and the I-01S Exes interface paging module. Also
available are the T-01S module featuring 600-ohm balanced
output capability and the T-02S module featuring auxiliary input
and balanced line output for music-on-hold.
For detailed module specifications, please refer to publication
TOA 900 Series Module Specifications, Features and
Connector Chart.
The W-906A and W-912A Mixer Power Amplifiers have a built-in
one-octave graphic equalizer with 9 bands to tailor sound
system frequency response to room acoustics, reducing
feedback 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 keep it constant.
The compressor’s threshold level can be adjusted. The W-906A
and W-912A Mixer Power Amplifiers have output terminals to
match 4- or 8-ohm speaker systems, or a speaker distribution
system may be connected to the 25 or 70-volt 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 inputs is increased.
Protection against tampering is assured by means of a keylocked hinged door. The W-906A and W-912A can be
mounted in any four-inch wall with use of the BX-9F Flush
Mounting Back Box. Wall mounting is also possible with use of
the BX-9S Surface Mounting Box.
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Specifications
Model
Type
Output Power
Power Bandwidth
Frequency Response
Total Harmonic Distortion
Inputs
Input Sensitivity/Impedance
Outputs
Output Regulation (1kHZ)
Signal-to-Noise Ratio
(Band Pass: 20-20,000 Hz)
Compression
Equalization
Filters
Controls
Indicators
Protection Circuitry
Connectors
Power
Consumption
User’s Space (Blank Panel)
Dimensions
Weight (without input modules and back box)
Color
Standard Accessories
Other Features
Associated Equipment
Note: (D): Direct output (T) Transformer output
W-906A
In-Wall mounting 6-channel mixer power amplifier
60W RMS
(D): 20—20,000Hz. 0.5% THD (T): 50—20,000Hz, 0.5% THD
(D): 30—20,000Hz ±1dB, (T): 30—15,000Hz ±1dB, (T): 30-20,000Hz +1dB, -2dB
X input ports: Each port accepts any input module except T-01S.
Si
One bridging input/output
Input ports #1 to #6: 100mV/10k ohms,
(D): Less than 0.5dB, no load to full load
(T): 8 ohms, 25V & 70V balanced
Controls OFF: 90dB
Master volume Max.: 77dB
Attack time:
Release time: variable 20 msec to 2 sec. Distortion:
9-band one-octave graphic equalizer
Center frequencies: ISO 63, 125, 250, 500, lk, 2k, 4k, 8k, 16k Hz
Equalization range: ±12dB
High-pass filter: 180Hz 12dB/octave Low-pass filter: 7kHz 12dB/octave
6 Input gain controls
1 Master gain control
1 Compression level control
9 Equalizer controls 1 Low-cut switch
1 Power ON/OFF switch
Built-in with 2 AC fuses (1 inside) and 1 output circuitry
Input #1 to #6: Card-edge connector
Output:
Bridging input/output: Screw-terminal strip
Output circuitry protection when heatsink temperature overheats
Screw-terminal strip
AC 120V, 60Hz, 100W
Effective space for customizing 4"(W) x 2-3/8"(H) x 3-3/4"(D)
Face panel: 26-3/4"(H) x 16-1/4"(W) x 1-1/8"(0) (680 x 412 x 28 mm)
30.20 Ibs (13.7kg)
Muting Function: provided for modules
*Power Bandwidth and Frequency Response are from input port to power amplifier output. *Specifications are subject to change without notice.
Output disconnect for approx. 5 sec. after power turned on
Plug-in modules (see module specifications)
Volume control cover..............................YA-910
Expanding kit.............................................WE-2
0.02% at 1 kHz, rated output
Bridging input/output 100mV/3.3k ohms
no greater than 2 milliseconds Compression range: 30dB
1 LED power indicator 1 LED peak indicator
Optional expanding kit WE-2 may be loaded
Silver
3 Volume control covers
(Use T-01S only in port #5 or #6.)
(D): 4 ohms, unbalanced
(T): Less than 1.0dB, no load to full load
Equalizer IN:
Compressor IN: 84dB
1 Equalization ON/OFF switch
1 High-pass filter ON/OFF switch
1 Low-pass filter ON/OFF switch
(60Hz, 6dB/octave, inside)
Mute
AC power cord SJT 3-conductor
38.14 lbs. (17.3kg)
U-11S, U-12S, B-11S, L-11S, M-11S, L-41S
W-912A
120W RMS
88dB
less than 1%
Screw-terminal strip
AC 120V, 60Hz, 180W
Controls and Functions
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Architect’s and Engineer’s Specifications
The In-Wall Amplifiers shall be capable of controlling and mixing up to 6
independent input signals plus 2 inputs with the use of an expanding kit.
The amplifiers shall deliver up to 60W or 120W of output power. The TOA
plug-in accessory modules designed for use with the W-906A and W-912A
In-Wall Amplifiers shall utilize the latest in surface mount component
technology and include the following modules: the M Series microphone
preamplifiers available with muting, remote volume control, voice gate and
compressor options, the U Series auxiliary preamplifiers available with
muting, remote volume control and compressor options. The B Series
bridging transformers, available with muting option, the L Series line
matching transformers, available with muting option, the S Series signal
generator modules and the I-01S Exes interface paging module. Also
available shall be the T-01S module featuring 600-ohm balanced output
capability and the T-02S module featuring auxiliary input and balanced line
output for music-on-hold.
The In-Wall Amplifiers shall have a built-in 1-octave graphic equalizer with
9 bands to tailor sound system frequency response to room acoustics,
reducing feedback tendencies and improving intelligibility. A built-in com-
pressor circuit shall be provided to protect output level from distortion as
a result of excessive input and keep it constant. The compressor’s
threshold level shall be able to be adjusted.
The In-Wall Amplifiers shall have output terminals to match 4- or 8-ohm
speaker systems, and shall allow a speaker distribution system to be
connected to the 25- or 70-volt terminals.
A user’s blank space shall be provided for additional functions chosen by
the user. This space shall accept an expanding kit (optional) when the
number of inputs is increased. A key-locked door shall be provided to
assure protection against tampering. The In-Wall Amplifiers shall be able
to be mounted in any 4-inch wall with use of the BX-9F flush mounting
back box. Wall mounting shall also be possible by using the BX-9S
surface mounting box. The In-Wall Amplifiers shall be TOA models W-906A
and W-912A.
Output Equalizer Characteristics
Frequency Response
at 1/10 rated output (Direct output: 4-ohm load,
Transformer output:
Power Output vs Frequency
at 0.5% THD (Direct output: 4-ohm load,
Transformer output:
70V line)
70V line)
*NOTE 1: THE T-01S MODULE WILL ONLY FUNCTION IN PORTS 5
AND 6 OF THE FOLLOWING MODELS: A-903A, A-906A, A-912A,
M-900A, W-906A AND W-912A.
*NOTE 2: W-906A AND W-912A IN-WALL AMPLIFIERS REQUIRE
MODULES WITH SCREW TERMINALS.
Optional Back Box
BX-9F
Back Box for
flush mounting
Weight:
12.35 Ibs. (56kg)
BX-9S
Back Box for
surface mounting
Weight:
16.09 Ibs. (7.3kg)
Printed by QQ Printing 3/97
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