DSPPA MP6906 Operation Manual - Page 9
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Fire brigade/PA system
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weaken them a little by adjusting the knob. The adjusting scope is 0～-30 dB. The adjustment is
set at -30 dB before dispatch from the plant.
To avoid the strong whistle of microphones, the equipment build in a frequency shift function
especially: Press down the selection switch "FREQ. SHIFT SWITCH" to turn on the frequency
shift function and when the selection switch is popped up, the frequency shift function is cancelled.
The frequency shift adjusting knob "FREQUENCY SHIFT" is used to adjust the frequency
shifting scope (the frequency shifting scope of microphone being 0-5 Hz).
3.6
Microphone and Priority Function
The equipment is equipped with 6 microphone ports in total, MIC1, MIC2, MIC3, MIC4, MIC5,
MIC6. Among them, the MIC1 and the chime signal have the priority function, and their signals
can override all the other signals. The microphones are provided with 24 V phantom power supply
to facilitate the operation of capacitive microphone.
While using the capacitive microphone, please turn the change over switch
"PHANTOM" to "ON".
When using the movable coil type microphone, please turn the change over switch
"PHANTOM" to "OFF".
4.
Precautions for Operation
4.1
Precautions for Safety Operation
Please do not insert the power supply plug of the equipment into the power network before
connecting properly the system circuitry.
It should be ensured that the voltage supplied to the equipment be completely meeting the
voltage requirements of the equipment, otherwise, there may exist the risk of burning the
equipment.
Danger voltage is inside the equipment, and the voltage is high enough to result in the
personnel electric shock. Please do not open the housing without authorization to prevent the
risk of electric shock.
When the power switch of the equipment is at "OFF" status, the machine is not disconnected
completely with the power network. For your safety, please pull out the power cord from the
socket when the equipment is not to be used.
Please do not place the equipment at a location too cold or too hot.
Ensure a good ventilation and a good working condition for the equipment to prevent heating
in the working hours, otherwise, the machine may be damaged due to too high a temperature.
The master power switch should be turned off at a cloudy day and damp weather or when the
equipment is not to be used for a long time.
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Conference power amplifier