Advertisement
N AP 250 P ower Amp li f i e r
3 7 I n sta lla tion a nd op era ti on
The naP 250 should be installed on a dedicated equipment stand intended for the
purpose and should be in its final location before connecting cables or switching on.
switch on the source and preamplifier 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.
3 7. 1 G eneral C on ne c t io n s n o t es
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.
3 7. 2 P rot ect ion no t e s
If the amplifier's external case reaches 70°C due to
prolonged running at high power, the mains supply will be
interrupted and the illuminated logo will switch off until
the amplifier has cooled down. This may take up to thirty
minutes.
38 naP 250 Connections
3 8. 1 n aP 2 5 0 re ar
mains input
and fuse
39 naP 2 5 0 s p e cifica t io n
Power output:
Quiescent Consumption:
Voltage Gain:
Input Impedance:
Frequency response:
Dimensions (H x w x D):
weight
mains supply:
left
speaker
80 Watts per channel, 8Ω
400 VA Transient
25VA
+29dB
18kΩ
-3dB @ 2Hz and 65kHz
87 x 432 x 314mm
15.8kg
100-120V or 220-240V, 50/60Hz
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.
37.3 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 amplifier ends of the
cable is the same for both channels.
right
speaker
signal input
ch1(L) & ch2(R)
Input
-ve
ch1
ch2
e37
Advertisement
