Nexo NUAR - Manual (Page 24)

SETTING-UP ADVICE
For the NXAMP4x4W this is slightly different; the unit is sensing the mains voltage on
power up, and then will choose to boot either in “110 Volts” mode or “220 Volts” mode.
Once the NXAMP4x4W has startup up in one of the two modes, it will be locked to the
corresponding voltage range till next power up.
NXAMP4x4W Mains settings
Mains Voltage when power up Mains Minimum Voltage
during use
Mains Minimum Voltage
during use
60 to 140 Volts 60 Volts 150 Volts
140 to 160 Volts The NXAMP will not start up
160 to 288 Volts 150 Volts 288 Volts
N.B.: for all NXAMP powered TDcontroller, the maximum amplifier output voltage is
proportional to the mains voltage.
Mounting the NXAMP in a rack (Grounding, shielding & safety issues)
The NXAMP Powered TDcontroller is intended for rack mounting. The only accessible part
during use shall be the front panel of the unit. Any space above or under the TDcontroller
shall be obstructed with a blank panel.
The rack is a free grounding and shielding structure and it provides extra shielding.
Therefore, it is desirable that the screws used to fix the NXAMP Powered TDcontroller in the
frame or rack provides an electrical contact between the chassis of the TDcontroller and
the rack.
The primary reason for grounding is safety. Conformance to the applicable requirements of
the authorities having jurisdiction is, of course, mandatory. However, grounding also has
an impact on electromagnetic compatibility. From the EMC point of view, it is desirable to
have a low impedance ground network, as a current flowing in the ground network will
then produce low voltage in the network. A low impedance network can be obtained using
a multipoint ground scheme, with as many closed ground loops as is economically possible.
Because of the amplifier weight, it is mandatory to fix the amplifier both from the front
panel and from the rear ears. The picture bellow shows the dimensions between the rack
holes on the front panel.
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