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E10
NAP 155 XS
14. NAP 155 XS Installation and Operation
The NAP 155 XS should be installed on a dedicated equipment stand intended for the purpose and should be in its nal
location before connecting cables or switching on. Switch on the source and preamplier components, with the volume
turned down, before switching on the NAP 155 XS. The NAP 155 XS power switch is located on the rear panel.
The NAP 155 XS can provide power for an appropriate Naim Audio preamplier. The power supply output is carried on the
DIN input socket.
14.1 General Connections Notes
The negative input and output connections are all common.
The mains earth should always be connected regardless of
what other equipment is used. This only grounds the case
and the electrostatic screen within the transformer, and is
not connected to the signal negative. In order to avoid hum
loops, the signal negative of the whole system should be
connected to the mains earth (ground) in one place.
14.2 Protection Notes
If the ampliers external case reaches 70°C due to
prolonged running at high power, the mains supply will be
interrupted and the illuminated logo will switch o until
the amplier has cooled down. This may take up to thirty
minutes.
OPERATION OF THE AMPLIFIER’S THERMAL PROTECTION
SUGGESTS PROLONGED USE AT TOO HIGH A VOLUME
LEVEL. YOUR LOUDSPEAKERS MAY BE AT RISK IF THIS IS
THE CASE. THE VOLUME SHOULD BE REDUCED.
14.3 Loudspeaker Cable and Connectors
Only Naim Audio speaker cable should be used to connect a
loudspeaker to the output of the NAP 155 XS. Custom Naim
Audio loudspeaker connectors are supplied to make the
connection and in order to comply with current European
safety regulations these should always be used.
DAMAGE TO THE AMPLIFIER MAY RESULT IF “HIGH
DEFINITION” CABLE OR ANY OTHER SPECIAL CABLE IS
USED TO CONNECT THE LOUDSPEAKERS.
Ensure when connecting speakers that they are “in phase.
That is, the positive and negative connection orientation at
both the speaker and amplier ends of the cable is the same
for both channels.
15. NAP 155 XS Connections
15.1 NAP 155 XS Rear
+V
ch2
-ve
ch1
24V
0.25A
Input/Preamp
Power Output
Note: The NAP 155 XS features various technologies to
reduce microphonic eects. Some movement of the board
and sockets when connecting and disconnecting cables is
normal.
12


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