Toa W-906A User manual

TOA 900 SERIES
IN-WALL AMPLIFIER
(60-WATT)
(120-WATT)
W-906A/912A

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 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.

Specifications
Note: (D): Direct output (T) Transformer output
Model
Type
Output Power
Power Bandwidth
Frequency Response
Total Harmonic Distortion
Inputs
Input Sensitivity/Impedance
Outputs
OutputRegulation(1kHZ)
Signal-to-Noise Ratio
(Band Pass: 20-20,000 Hz)
Compression
Equalization
Filters
Controls
Indicators
Protection Circuitry
W-906A W-912A
In-Wall mounting 6-channel mixer power amplifier
60W RMS 120W 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
SiX 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: 90dB Equalizer IN: 88dB
Master volume Max.: 77dB Compressor 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 controls 1 Equalization ON/OFF switch
1 Master gain control 1 High-pass filter ON/OFF switch
1 Compression level control 1 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
User’s Space (Blank Panel)
Input #1 to #6: Card-edge connector Mute Screw-terminal strip
Output: Screw-terminal strip AC power cord SJT 3-conductor
Bridging input/output: Screw-terminal strip
AC 120V, 60Hz, 100W AC 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

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-inaccessory modulesdesigned foruse withthe W-906Aand W-912A
In-WallAmplifiersshallutilizethelatestinsurfacemountcomponent
technology and include the following modules: the M Series microphone
preamplifiersavailable withmuting, remotevolumecontrol, voicegate and
compressoroptions,theUSeriesauxiliarypreamplifiersavailablewith
muting, remote volume control and compressor options. The B Series
bridgingtransformers, availablewith mutingoption,the LSeries line
matchingtransformers,availablewithmutingoption,theSSeriessignal
generatormodulesand theI-01SExesinterfacepaging module.Also
availableshallbetheT-01Smodulefeaturing600-ohmbalancedoutput
capability and the T-02S module featuring auxiliary input and balanced line
outputformusic-on-hold.
TheIn-WallAmplifiersshallhaveabuilt-in1-octavegraphicequalizerwith
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
thresholdlevel shallbe ableto beadjusted.
TheIn-WallAmplifiersshallhaveoutputterminalstomatch4-or8-ohm
speakersystems,andshallallowaspeakerdistributionsystemtobe
connectedtothe25-or70-voltterminals.
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
assureprotectionagainsttampering.TheIn-WallAmplifiersshallbeable
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
surfacemountingbox.TheIn-WallAmplifiersshallbeTOA modelsW-906A
Output Equalizer Characteristics
Frequency Response
at 1/10 rated output (Direct output: 4-ohm load,
Transformer output:
70V line)
Power Output vs Frequency
at 0.5% THD (Direct output: 4-ohm load,
Transformer output:
70V line)
andW-912A.
*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
MODULESWITHSCREW TERMINALS.
Optional Back Box
BX-9F
Back Box for
flushmounting
Weight:
12.35 Ibs. (56kg)
BX-9S
Back Box for
surfacemounting
Weight:
16.09Ibs.(7.3kg)
Printed by QQ Printing 3/97