Aiphone BX-1200 - Manual (Page 6)

Make certain that all input cables are kept away from speaker cables, power cables and power trans­
formers.
Speaker cables must also be kept away from power cables.
Grounding the Unit:
The chassis of the unit must be grounded by using the GROUND terminal located on the back.
The amplifier must be connected to an earth ground such as a cold water pipe or a substitution of the
ground. If additional equipment is installed along with the amplifier, make sure that the additional
chassis are also grounded.
DC Power Connection (only BX-300):
The unit may also be powered by an externa! 12 volt battery or other direct current source with negative
{—) as ground.
Power connection is made at the DC terminal strip on the back panel.
Ventilation:
In order to offset the heat generated by the unît, it is necessary to provide ample ventilation around the
unit-
Avoid blocking or impeding the ventilation holes and slits on the unit.
Locate the unit where it is free from direct sunlight, humidity, dust circulation or vibrations to prevent
any unnecessary problems.
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INPUT CONNECTIONS
Microphones:
Three microphone inputs on the BX-300 and four microphone inputs on the BX-600 and BX-1200 are
provided.
They may be used with balanced or unbalanced high impedance (20Kohm) or low impedance (200 ohm)
microphones. An unbalanced microphone with 30' to 60' (10 to 20m) of cable may be used, but results
will depend on the microphone and its characteristics.
MIC-1, MIC-2, MIC-3 and MIC-4:
The MlC-1 input is unbalanced high impedance and is provided with a ka" phone jack located on the
front panel.
MiC-2, -3, -4 inputs are balanced low impedance and all are located on the back panel.
Unbalanced High Impedance Microphone:
Use with single conductor shielded cable.
Unbalanced microphone Single pole phone plug