OPERATING INSTRUCTIONS
NEW 900 SERIES
IN-WALL MIXER POWER AMPLIFIER
W-906A
W-912A
900 SERIES
WALL AMPLIFIER
POWER
PEAK
POWER
OFF
AC FUSE OUTPUT FUSE
COMPRESSOR
ON
250
V
3
A
250
V
6
A
OFF
MAX
EQUALIZER
OUT IN
HIGH PASS
OFF ON
LOW PASS
OFF
ON
63
1
2
5
2
5
0
5
0
0
1
k
2
k
4
k
8
k
16
k
12
6
12
6
0
0
6
6
12
12
63
1
2
5
2
5
0
5
0
0
1
k
2
k
4
k
8
k
16k
INPUT
1
INPUT
2
INPUT
3
INPUT
4
INPUT
5
INPUT
6
MASTER
TABLE OF CONTENTS
1. GENERAL DESCRIPTION ............................ 2
6. OPERATION ................................................ 8
7. HOW TO USE VOLUME CONTROL COVER .... 9
8. OUTPUT EQ CHARACTERISTIC ............. 10
9. BLOCK DIAGRAM .................................... 10
2. FEATURES .................................................... 2
3. NOMENCLATURE AND FUNCTIONS
Front .............................................................. 3
Front (viewed with the front cover removed) .... 4
10. SPECIFICATIONS ..................................... 11
4. INSTALLATION AND CONNECTION .......... 5
Accessories ................................................ 12
5. SERVICING .................................................... 8
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.
3. NOMENCLATURE AND FUNCTIONS
[Front]
900 SERIES
WALL AMPLIFIER
Equalizer Section
11
10
12
13
6
7
8
5
14
EQUALIZER
HIGH PASS
LOW PASS
OUT
IN
OFF
ON
OFF
ON
63
125 250 500
1k
2k
4k
8k
16k
POWER
PEAK
12
6
12
6
0
POWER
OFF
AC FUSE OUTPUT FUSE
COMPRESSOR
ON
250V 3A
250V 6A
0
OFF
MAX
1
6
6
EQUALIZER
HIGH PASS
LOW PASS
OFF ON
OUT
IN
OFF
ON
12
12
63
125 250 500
1k
2k
4k
8k
16k
12
6
12
6
0
63
125 250 500
1k
2k
4k
8k
16k
0
6
6
15
16
12
12
63
125 250 500
1k
2k
4k
8k
16k
INPUT
1
INPUT
2
INPUT
3
INPUT
4
INPUT
5
INPUT
6
MASTER
2
4
9
Equalizer Section
3
1. Power switch
10. Power indicator
Applies line power. Two-position push button
Comes on when power is switched on.
switch for on-off modes.
11. Peak indicator
2. Input volume controls
Comes on when the output signal reaches the
Adjust gain of input 1 – 6 respectively.
rated output power level.
3. Master volume controls
12. Output fuse
Adjust overall gain of unit.
Prevents excessive current flow.
W-906A: 250 V, 6 A
4. Modules (optional)
W-912A: 250 V, 10 A
Select appropriate modules according to the
application.
13. AC fuse
Prevents excessive current flow.
W-906A: 250 V, 3 A
W-912A: 250 V, 5 A
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).
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.
6. Equalizer switch
Place this switch in the IN position to activate an
equalizer.
15. Equalizer security cover
Prevents inadvertent changes of the equalizer
7. High-pass filter switch
controls set at proper level.
Place this switch in the ON position to cut off
unnecessary low frequency.
16. Key-locked door
Prevents tampering.
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.
3
[Front] (viewed with the front cover removed)
18
17
19
20
POWER
OFF
AC FUSE OUTPUT FUSE
250V 3A 250V 6A
COMPRESSOR
ON
OFF
MAX
EQUALIZER
HIGH PASS
LOW PASS
OFF ON
OUT
IN
OFF
ON
63
125 250 500
1k
2k
4k
8k
16k
12
6
12
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
Junction Box
22
23
21
24
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
the modules are muted by short-circuiting at this
terminal.
18. Speaker output terminals
Connects to speakers.
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.
4
4. INSTALLATION AND CONNECTION
Installing this amplifier requires the optional back box, which is Model BX-9F for flush mounting in any 4 inch
wall and Model BX-9S for surface mounting.
Fix the back box first in installing the amplifier...
Installing Procedure
Step 1. Attach hinges to the back box by means of screws. (The hinges and screws are accessories supplied
free of change.)
Step 2. Fix the amplifier to the back box by inserting the amplifier bolts into the hinges as illustrated.
HINGE
POWER
OFF
AC FUSE OUTPUT FUSE
250 250
COMPRESSOR
ON
V
3
A
V
6
A
OFF
MAX
EQUALIZER
OUT IN
HIGH PASS
OFF ON
LOW PASS
OFF
ON
63
1
2
5
2
5
0
5
0
0
1
k
2
k
4
k
8
k
16
k
12
6
12
6
0
0
6
6
12
12
63
1
2
5
2
5
0
5
0
0
1
k
2
k
4
k
8
k
16k
INPUT
1
INPUT
2
INPUT
3
INPUT
4
INPUT
5
INPUT
6
MASTER
M3 x 6 mm
(6 pcs)
Amplifier
Back Box
(main chassis)
BX-9F, BX-9S
From indoor wiring
BLACK
Step 3. Connecting power cable
Be sure to make proper cable connections according to
color cording of the power cable.
After connection is completed, insulate sufficiently the
jointed sections and put them in a junction box.
GREEN
GREEN
WHITE
WHITE
BLACK
Junction Box
Step 4. Attaching the junction box to the back box
The BX-9F differs from the BX-9S in the way to attach the junction box to the back box.
[BX-9F]
[BX-9S]
+
M3 x 10 screw (4 pcs)
+
M3 x 8 Tapping screw
(4 pcs)
Nut M3 (4 pcs)
SPEAKER TERMINAL
Step 5. Connecting the speaker cable
Connect the speaker cable to the speaker terminals on
the junction box. Amplifier output impedance may be
selected at the output terminals on the front panel.
Class 2 Wiring
may be used.
SPEAKER CORD
5
Step 6. Fixing the amplifier
Fix the amplifier to the back box with screws
after connecting the power cable and the
speaker cable.
M4 x 10 mm Screw
(3 pcs)
POWER
OFF
AC FUSE OUTPUT FUSE
250 250
COMPRESSOR
ON
V
3
A
V
6
A
OFF
MAX
EQUALIZER
OUT IN
HIGH PASS
OFF ON
LOW PASS
OFF
ON
63
1
2
5
2
5
0
5
0
0
1
k
2
k
4
k
8
k
16
k
12
6
12
6
0
0
6
6
12
12
63
1
2
5
2
5
0
5
0
0
1
k
2
k
4
k
8
k
16k
INPUT
1
INPUT
2
INPUT
3
INPUT
4
INPUT
5
INPUT
6
MASTER
Step 7. Selecting output impedance
Select appropriate output impedance that matches the speaker to be used.
Class 2 wiring may be used.
Since these outputs consist of 8 Ω, 25 V and 70 V via the output transformer (matching transformer) and
direct output of 4 Ω, the connecting method differs in each case. See the following diagram.
Note: Impedances indicated below imply total speaker system (load) impedances.
• When connecting speakers to any one of the outputs of 8 Ω, 25 V or 70 V (BALANCED TRANSFORMER
OUTPUT); connect as illustrated below.
[W-906A]
[W-912A]
Change cable connection for required impedance
according to the speaker used.
Change cable connection for required impedance
according to the speaker used.
SPEAKER
OUTPUT
SPEAKER
OUTPUT
c
a
c
a
b
b
OT
OT
+
–
+
–
70V 25V 8Ω COM IN
4Ω
70V 25V 8Ω COM IN
4Ω
Insert shorting bar
between 4 Ω and OT IN
Insert shorting bar
between 4 Ω and OT IN
+
+
a
a
8 Ω
8 Ω
or
or
b
c
10.4 Ω (25 V line)
or
b
c
5.2 Ω (25 V line)
or
41 Ω (70 V line)
83 Ω (70 V line)
Note
In this case, the LOW-CUT SWITCH should be in "CUT" position. The
amplifier is characteristically flat even in the low frequency range.
Therefore, in TRANS OUTPUT, the acoustic effect and frequency-
response characteristics may be altered. In TRANS OUTPUT, cut off
unnecessary low frequency to obtain the best acoustic condition.
CUT
LOW-CUT
FLAT
Place the LOW-CUT SWITCH
in "CUT" position
• When connecting speakers to the 4 Ω, output (UNBALANCED DIRECT OUTPUT); connect as illustrated
below.
4 Ω
SPEAKER
OUTPUT
OT
+
–
70V 25V 8Ω COM IN
4Ω
Remove shorting bar
6
Step 8. Input connections
• This unit has six INPUT PORTS for plug-in modules. Select the desired modules for each application.
• Plug the modules into INPUT PORTS, sliding them between the guide rails, and secure each with two screws.
CAUTION
Modules should no be inserted or removed
while the amplifier is turned on.
• When not all INPUT PORTS are occupied, cover the vacant PORTS with back panels, and secure them with
screws.
• PLUG-IN MODULES are provided in the following:
Balanced low impedance microphone preamp. module (with presettable low-cut
filter, high-cut filter and gain controls)
H-01, H-21
H-02, H-22
H-03
Balanced low impedance microphone preamp. module (with presettable low-cut
filter, and gain controls)
Unbalanced high impedance microphone preamp. module (with presettable low-
cut filter, high-cut filter and gain control)
Equalized mag. phono preamp. module (with presettable gain controls)
E-01, E-11
Unbalanced high impedance auxiliary preamp. module (with presettable gain
control)
X-01, X-11, X-21
Balanced 10 kΩ bridging transformer module
B-01, B-11
L-01
Balanced 600 Ω line matching transformer module
Balanced paging input module (with presettable gain control and MUTE Delay)
Balanced 600 Ω line output module (with presettable gain control)
I-01
T-01
Signal tone generator module (with presettable output level control)
· 1 kHz sine wave
· Yelp and buzzer
S-01
S-02
S-03
· One-tone chime and continuous one-tone chime
· With H-21, H-22 and X-21 modules employing volume remote control functions, connecting a
potentiometer (10 kΩ) to the terminal of any of these modules permits the sound volume to be remotely
controlled by means of the connected potentiometer.
· E-11, X-11 and B-11 modules incorporate muting functions. If a switch is connected to MUTE TERMINAL
on the rear panel of the amplifier and closed, these input signals can be muted.
· T-01 is used to feed out mixed signals to external equipment.
· T-01 should be inserted only in Input Port 5 or 6. (See the supplied "NEW 900 SERIES MODULES"
manual for details.)
Unite these cables to allow free rotation of the amplifier.
Note
Use modules with suffix "S" for standard input port.
7
Input Expander
The optional expanding kit (WE-2) is necessary to increase
the number of input. Up to two inputs may be added by
loading the expanding kit in the user's space. For details, refer
to the instruction manual of the kit.
CAUTION
Installation of optional items should be performed by a
qualified service personnel.
Expanding kit WE-2
Modules
Note
When the temperature of heat sink exceeds 105°C, the protection circuit is activated and the output is
disconnected from the circuit. The signal automatically begins to be output as the temperature goes down. In
such a case, confirm whether or not unit is overloaded or operated on an excessive output.
5. SERVICING
Unpacking
Upon receipt of the amplifier shipment, please incurred for any damage incurred in transit. If damage is found,
please notify your local TOA representative and the transportation company immediately.
State date, nature of damage, whether any damage was noticed on the shipping container, prior to unpacking.
Please give waybill number of shipping order.
Failure
Should amplifier fail, contact your nearest TOA authorized contractor or service center.
6. OPERATING
When all connections are completed, turn power switch on.
Then, the power indicator is illuminated. Approx. 5 seconds after switching power on, the amplifier comes into
operation.
Adjustment of Volume
Adjust the individual input and master volume controls to obtain appropriate output level.
When the peak indicator remains lit, reduce the sound volume to turn it off. If the system is operated with the
peak indicator lighting, it downgrades sound quality.
Adjusting graphic equalizer
The one-octave graphic equalizer tailors sound system frequency response to room acoustics, reducing feed-
back tendencies and improving intelligibility. Characteristic of this equalizer is as per below graph. Adjust it to
obtain the desired frequency response by actually hearing the sound or by using pink noise.
To make the adjustment, place the EQ switch in the IN position.
If a control knob is moved toward the plus (+) direction, center frequency is boosted and if toward the minus
(–) direction, it is cut. Placing the EQ switch in the OUT position bypasses the equalizer circuit and makes
frequency response flat.
Filter
When the HIGH PASS FILTER switch is in the ON position, low frequency is cut. In this event, low frequency
below 180 Hz may be cut at a 12 dB/OCTAVE rate. When LOW PASS FILTER switch is in the ON position,
high frequency of 7 kHz or higher may be cut at a 12 dB/OCTAVE rate.
To bypass the filter, place the filter in the OFF position.
8
Compressor
OFF
COMPRESSOR
CONTROL
If the COMPRESSOR CONTROL switch is set to
OFF, it bypasses the compressor circuit. Turn it
clockwise to activate the compressor and to adjust
the limiting level. Since turing it fully clockwise far
too much limits the output level, set the switch at a
maximum point that does not cause the peak
indicator to light up.
Clip
Output
HALF
Rated
1/2
MAX
Input
Release time control
Adjusting release time
Compressor release time is set at 2 seconds on the
amplifier supplied from the factory. Adjust the
release time, if necessary, by means of the release
time controls at the rear of the amplifier.
VR303
VR302
MAX
MIN
Equalizer printed
circuit board
VR301
CN302
Output Fuse
Each amplifier has an output fuse to protect the amplifier from short-circuiting at the output or overloading.
Check the fuse when speakers connected do not sound even if the meter deflects normally. If the fuse blew,
replace with the same type fuse after confirming the following points.
Step 1. Speaker cables are not short-circuited or the load does not exceed the rating specified.
Step 2. Wiring is correctly done at the output terminal board.
7. HOW TO USE VOLUME CONTROL COVER
Step 1. After adjusting the input volume control, remove its knob.
Step 2. Attach the supplied volume control cover to the chassis in place of the knob.
2
Volume control cover YA-910
1
Input volume control cover knob
Note: The unit comes with 3 volume control covers as standard accessories. Ask for the optional one model
YA-910 as necessary.
9
8. OUTPUT EQ CHARACTERISTIC
dB
+12
+10
+8
+6
+4
+2
0
–2
–4
–6
–8
–10
–12
20
50
100
200
500
1k
2k
5k
10k 20k
Hz
9. BLOCK DIAGRAM
+24V DC
#1
High-pass filter
Low-pass filter
Module
(180Hz,12dB/Oct.) (7kHz,12dB/Oct.)
OT
Input Ports
–20dB V
(100mV)
10kΩ
Balanced
Transformer
Output
8Ω, 25V, 70V
on
off
on
off
Unbalanced
Direct Output
4Ω
Compressor
(Limiter)
off
Equalizer
Out
Thermostat 105°C
Power
Amp.
Output
Fuse
In
Low-cut
Master
Volume
Control
(60Hz,6dB/Oct.)
#5
#6
Relay
1
Speaker
Output
Terminal
Peak
Indicator
EQ
COMP.
A
2
Relay
B
Protecting Circuit
Equarizer Control
63Hz – 16kHz
Release Compressor
• Output Muting
Time
(Limiter)
Control
• DC Drift
250V
1A
PT
+24V DC
Power
Switch
Mute
Power
Indicator
Bridging In/Out
–20dBV, 3.3kHz
AC 120V
60Hz
+Vcc
AC
Fuse
–Vcc
0 dBV = 1 V = approx. 2 dBm
10
10. SPECIFICATIONS
Model No.
Type
Output Power
Power Bandwidth
W-906A
Wall mounting 6-channel mixer power amplifier
60 W RMS 120 W RMS
(D): 20 – 20,000 Hz, 0.5% THD
W-912A
(T): 20 – 20,000 Hz, 0.5% THD
Frequency Response
(D): 30 – 20,000 Hz, 1 dB
(T): 30 – 15,000 Hz, 1 dB
(T): 30 – 20,000 Hz, 1 dB, – 3 dB
Total Harmonic Distortion
Inputs
0.02% at 1 kHz, rated output
Six input ports: Each port accepts any input module except T-01S.
Use T-01S only in port 5 or 6. One bridging input/output.
Input Sensitivity/Impedance
Outputs
Input ports 1 to 6: 100 mV, 10 kΩ
Bridging input/output: 100 mV, 3.3 kΩ
(T): 8 Ω, 25 V and 70 V, balanced
(D): 4 Ω, unbalanced
Output Regulation (1 kHz)
(D): Less than 0.5 dB, no load to full load.
(T): Less than 1.0 dB, no load to full load.
Signal to Noise Ratio
Controls OFF:
90 dB
(Band Pass: 20 – 20,000 Hz)
Master volume Max: 77 dB
Equalizer IN:
Compressor IN:
88 dB
84 dB
Compression
Equalization
Attack time:
Compression range: 20 dB
Release time:
Distortion:
No greater than 2 milliseconds
Adjustable 20 – 2,000 milliseconds
Less than 1%
9-Band ISO One-octave graphic equalizer
Center frequencies: 63, 125, 250, 500, 1000, 2000, 4000, 8000, 16000 Hz
Equalization range: 12 dB
Filters
High-pass filter: 180 Hz, 12 dB/octave
Low-pass filter: 7 kHz, 12 dB/octave
Controls
6 Input gain controls, 1 Master gain control, 1 Compression level control,
9 Equalizer controls, 1 Power ON/OFF switch, 1 Equalizer ON/OFF switch,
1 High-pass filter ON/OFF switch, 1 Low-pass filter ON/OFF switch,
1 Low-cut switch (60 Hz, 6 dB/octave, inside)
Indicators
Protection
Connectors
1 LED power indicator, 1LED peak indicator
Self-protection, with 2 AC fuses (1 inside) and 1 output fuse
Input 1 to 6:
Output:
Card-edge connector
Screw-terminal strip
Bridging input/output: Screw-terminal strip
Mute:
AC Power cord:
Screw-terminal strip
SJT 3-conductor
Power Consumption
Color
Dimensions
AC120 V, 60 Hz, 100 W
AC120 V, 60 Hz, 180 W
Silver
412 (w) x 680 (h) x 28 (d) mm
Face panel:
BX-9F Back Box: 362 (w) x 628 (h) x 98 (d) mm
BX-9S Back Box: 412 (w) x 680 (h) x 98 (d) mm
Weight
13.7 kg
17.3 kg
(without input modules and back box) (without input modules and back box)
Other Features
Output disconnect for approx. 5 sec after power turned on.
Muting Function: Accomplished by input module X-11S, B-11S and E-11S.
* Power Bandwidth and Frequency Response are from input port to power amplifier output.
Note: The design and specifications are subject to change without notice for improvement.
11
• Accessories
Volume control cover .......................................... 3
Key (for door) ...................................................... 2
Lift-off hinge (receptacle) .................................... 2
Machine screw M4 x 10 ...................................... 5
Machine screw M3 x 6 ........................................ 6
Machine screw M3 x 10 ...................................... 4
Flange nut ........................................................... 4
Tapping screw 3 x 8 ............................................ 4
Inch screw ........................................................... 4
Indication label .................................................... 1
Instruction manual (W-906A/-912A) .................... 1
Instruction manual (New 900 series modules) .... 1
• Optional products
Flush-mounting (in-wall) back box:
BX-9F
Expanding kit:
WE-2
Surface-mounting (on-wall) back box: BX-9S
Volume control cover (black): YA-910
133-02-738-9B
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