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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 andcompressor 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 compressors 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. Users (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 key-
locked 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 Note: (D): Direct output (T) Transformer output
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
W-906AW-912A
In-Wall mounting 6-channel mixer power amplifier
60W RMS120W 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
0.02% at 1 kHz, rated output
Si
X input ports: Each port accepts any input module except T-01S.
One bridging input/output(Use T-01S only in port #5 or #6.)
Input ports #1 to #6: 100mV/10k ohms,Bridging input/output 100mV/3.3k ohms
(T): 8 ohms, 25V & 70V balanced(D): 4 ohms, unbalanced
(D): Less than 0.5dB, no load to full load(T): Less than 1.0dB, no load to full load
Controls OFF:90dBEqualizer IN:88dB
Master volume Max.: 77dBCompressor IN: 84dB
Attack time:no greater than 2 milliseconds Compression range: 30dB
Release time: variable 20 msec to 2 sec. Distortion:less than 1%
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 controls1 Equalization ON/OFF switch
1 Master gain control1 High-pass filter ON/OFF switch
1 Compression level control1 Low-pass filter ON/OFF switch
9 Equalizer controls 1 Low-cut switch
1 Power ON/OFF switch(60Hz, 6dB/octave, inside)
1 LED power indicator 1 LED peak indicator
Built-in with 2 AC fuses (1 inside) and 1 output circuitry
Output circuitry protection when heatsink temperature overheats
Connectors
Power Consumption
Users Space (Blank Panel)
Input #1 to #6: Card-edge connectorMuteScrew-terminal strip
Output:Screw-terminal stripAC power cord SJT 3-conductor
Bridging input/output: Screw-terminal strip
AC 120V, 60Hz, 100WAC 120V, 60Hz, 180W
Effective space for customizing 4"(W) x 2-3/8"(H) x 3-3/4"(D)
Optional expanding kit WE-2 may be loaded
Dimensions Face panel: 26-3/4"(H) x 16-1/4"(W) x 1-1/8"(0) (680 x 412 x 28 mm)
Weight (without input modules and back box) 30.20 Ibs (13.7kg)38.14 lbs. (17.3kg) Color Silver
Standard Accessories 3 Volume control covers
Other Features Output disconnect for approx. 5 sec. after power turned on
Muting Function: provided for modules U-11S, U-12S, B-11S, L-11S, M-11S, L-41S
Associated Equipment Plug-in modules (see module specifications)
Volume control cover..............................YA-910
Expanding kit.............................................WE-2
*Power Bandwidth and Frequency Response are from input port to power amplifier output. *Specifications are subject to change without notice.
Controls and Functions
