Warning – Toa W-912A Service Manual User Manual
Page 10
10
Step 5. Connect the speaker cable.
Connect the speaker cable to the speaker
output terminals on the junction box. Amplifier
output impedance may be selected at the
output terminals on the front panel.
[Speaker cable treatment]
Strip 10 mm (0.39") of insulative jacket from the cable end, as shown
in the figure at right.
Step 6. Fix the amplifier.
Secure the amplifier to the back box using the 3 supplied
M4 x 10 machine screws after connecting the power
cable and the speaker cables.
Note that the extra 2 out of 5 supplied screws are spare.
Step 7. Select output impedance.
Select appropriate output impedance that matches the speaker to be used.
Use Class 2 wiring.
The unit has 25 V and 70 V outputs for constant voltage speaker system and low impedance output
for 4 Ω and 8 Ω speaker loads. In these speaker outputs, only the 4 Ω output is a direct output while
other outputs are transformer outputs. Connect the speaker system to only one of the speaker
outputs. Refer to the following connection diagrams described for each model.
Note: Impedances indicated in the diagrams mean total speaker load impedance.
Speaker output terminals
Class 2 Wiring
Speaker cable
10 mm (0.39”)
The terminals marked with the symbol
are hazardous live.
The external wiring to these terminals requires installation by an
instructed person.
WARNING
Machine screw M4 x 10
(accessory)
INPUT 1
POWER
ON
250V 3A
250V 6A
OFF
OFF
MAX
INPUT 2
INPUT 3
AC FUSE
OFF
ON
LOW PASS
OFF
ON
HIGH PASS
OUT
63
125
250
500
1k
2k
4k
8k
16k
63
125
250
500
1k
2k
4k
8k
16k
IN
EQUALIZER
OUTPUT FUSE
COMPRESSOR
INPUT 4
INPUT 5
INPUT 6
MASTER
12
6
0
6
12
12
6
0
6
12
COM
8Ω
4Ω
25V
70V
OT
IN +
–
a
b
c
a
b
c
a
b
c
8 Ω
or
10.4 Ω (25 V line)
or
83 Ω (70 V line)
+
Insert jumper strip
between 4 Ω and OT IN
.
SPEAKER
OUTPUT
COM
8Ω
4Ω
25V
70V
OT
IN +
–
a
b
c
8 Ω
or
5.2 Ω (25 V line)
or
41 Ω (70 V line)
+
Insert jumper strip
between 4 Ω and OT IN
.
SPEAKER
OUTPUT
Change cable connection for required impedance
according to the speaker used.
Change cable connection for required impedance
according to the speaker used.
[W-906A]
[W-912A]