Naim Audio NAP 500 - Manual (Page 9)

E7
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 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.
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 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.
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 amplifier ends of the cable is the same for both
channels.
NAP 250
ch2
-ve ch1
Input
mains input
and fuse
signal input
ch1(L) & ch2(R)
9 NAP 250 Connections
9.1 NAP 250 Rear
left
speaker
right
speaker