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E7
NAP 250
8. NAP 250 Installation and Operation
The NAP 250 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 250. The NAP 250 power button is located on the front panel.
The NAP 250 is heavy and care should be taken when lifting or moving it. Make sure that the surface it is to be placed on can
support the full weight.
8.1 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.
8.2 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.
8.3 Loudspeaker Cable and Connectors
Only Naim Audio speaker cable should be used to connect
a loudspeaker to the output of the NAP 250. 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.
ch1 left
+
+
WARNING:
DO NOT REPLACE SUPPLIED LOUDSPEAKER
PLUGS WITH INDIVIDUAL 4mm PLUGS
Loudspeaker Input
ch2 right
WARNING:
DO NOT REPLACE SUPPLIED LOUDSPEAKER
PLUGS WITH INDIVIDUAL 4mm PLUGS
-
-
Loudspeaker
FUSE RATING: ANTISURGE
100V TO 120V: T6.3AL.
200V TO 240V: T3.15AL/250V.
AC ONLY
FREQUENCY: 50/60Hz
INPUT POWER: 220VA
Power
-ve
ch2
ch1
WARNING:
DISCONNECT SUPPLY CORD
BEFORE OPENING
ATTENTION:
DEBRANCHER AVANT D’OUVRIR
WARNING:
THIS APPARATUS MUST
BE EARTHED
DESIGNED AND MADE IN ENGLAND BY NAIM AUDIO LTD.
SOUTHAMPTON ROAD, SALISBURY
NAP 250
PLEASE READ THE MANUAL BEFORE USE
CONFORMS
TO EN 60065
S/No.
E2378
DR
S
NE 501
ch2
-ve
ch1
Input
Ch1 & Ch2
9. NAP 250 Connections
9.1 NAP 250 Rear
9


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