Naim Audio NAC-N 172 XS - Manual (Page 40)

E38
40.1 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.
40.2 Protection Notes
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.
40 Installation and Operation
The NAPV 145 is a mono power amplifier intended for use in audio-visual systems. The
NAPV 145 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 NAPV 145. The NAPV 145 power button is located on the front panel.
The NAPV 145 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.
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.
40.3 Loudspeaker Cable and Connectors
Only Naim Audio speaker cable should be used to connect
a loudspeaker to the output of the NAPV 145. 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.
mains input
and fuse
signal input
NAPV 145 Power Amplifier
42 NAPV 145 Specification
Power Output: 80 Watts, 8Ω
Quiescent Consumption: 15VA
Voltage Gain: +29dB
Input Impedance: 18kΩ
Frequency Response: -3dB @ 2Hz and 65kHz
Dimensions (H x W x D): 87 x 432 x 314mm
Weight 15.8kg
Mains Supply: 100V, 115V or 230V, 50/60Hz
speaker
41 NAPV 145 Connections
41.1 NAPV 145 Rear
nc
-ve i/p
Input