Speaker Line Input Connection; Emergency Control Connection - Toa P-3548D Instruction Manual

6.2. Speaker Line Input Connection

For cable wiring to the removable terminal block, refer to p. 12.
Connect the high impedance (100 V) speaker wiring of other amplifier to the Speaker line input terminals.
Speaker line input
volume control
Nominal position mark
[Volume adjustment]
First, set the Speaker line input volume control at the nominal position mark.
Then, adjust the volume with the Master volume control on the front panel while
monitoring the sound being broadcast from the speakers.
When the volume is still insufficient even if you turn the Master volume control fully
clockwise, adjust the volume by turning the Speaker line input volume control clockwise
from the nominal position mark.
When the sound is distorted even if you adjust the volume with the Master volume control,
adjust the volume by turning the Speaker line input volume control counterclockwise
from the nominal position mark.

6.3. Emergency Control Connection

For cable wiring to the removable terminal block, refer to "Removable Terminal Plug Connection" on p. 12.
6.3.1. Emergency control input terminal connection
Shorting the Emergency control input terminals forcibly
turns the unit's power ON, delivering signals at the Line
output and speaker output terminals bypassing the
Master Volume Control.
Control input signal specification: Short-circuit current: 10 mA or less, open voltage: 35 V DC or less
6.3.2. Emergency control output terminal connection
Use this terminal when remotely controlling other
equipment. This terminal is activated while the emergency
broadcast is in progress from this unit.
Control output signal specification: Open collector output (polarized), withstand voltage: 30 V DC or less,
Speaker line input terminals
Impedance: 65 kΩ
current: 25 mA or less
Other
Amplifier
P-3548D
Master volume control
From other equipment' s
emergency control output terminal
To other equipment' s
emergency control input terminal
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