TOA Electronics Stereo Amplifier W 906A User Manual

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.  
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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
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[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 k.  
4
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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
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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 , 25 V and 70 V via the output transformer (matching transformer) and  
direct output of 4 , 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 , 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 8COM IN  
4Ω  
70V 25V 8COM IN  
4Ω  
Insert shorting bar  
between 4 and OT IN  
Insert shorting bar  
between 4 and OT IN  
+
+
a
a
8 Ω  
8 Ω  
or  
or  
b
c
10.4 (25 V line)  
or  
b
c
5.2 (25 V line)  
or  
41 (70 V line)  
83 (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 , output (UNBALANCED DIRECT OUTPUT); connect as illustrated  
below.  
4  
SPEAKER  
OUTPUT  
OT  
+
70V 25V 8COM IN  
4Ω  
Remove shorting bar  
6
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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 kbridging transformer module  
B-01, B-11  
L-01  
Balanced 600 line matching transformer module  
Balanced paging input module (with presettable gain control and MUTE Delay)  
Balanced 600 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 k) 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
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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
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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
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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)  
10k  
Balanced  
Transformer  
Output  
8, 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  
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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 , 25 V and 70 V, balanced  
(D): 4 , 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  
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• 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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