Naim Audio NAP 500 - Manual (Page 7)

E5
6.1 General Connections Notes
The negative input and output connections for each channel are
common. The mains earth (ground) should always be connected
regardless of what other equipment is used in conjunction
with Naim power amplifiers. 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.
6.2 Protection Notes
In the NAP 300 the fan speed is increased in response to an
increase in amplifier dissipation. If the amplifier reaches 70°C
due to prolonged running at high level or to airflow being
blocked, the output will be interrupted and the fan will run at full
speed until it has cooled down. This may take a few minutes.
It is not necessary to switch the amplifier off, but it may be
advisable to mute the preamplifier or turn the volume down to
avoid surprises when it comes back on.
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.
6 NAP 300 Installation and Operation
The NAP 300 and NAP 300PS should be installed on a dedicated equipment stand intended
for the purpose and should be in their 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 300. The NAP 300 power button is located on the front panel of the
NAP 300PS Power Supply.
Care should be taken when siting the NAP 300 to ensure that the underside fan inlet and rear
outlet are not obstructed.
The NAP 300 and NAP 300PS are heavy and care should be taken when lifting or moving
them. Make sure that the surface they are to be placed on can support the full weight.
6.3 Loudspeaker Cable and Connectors
Only Naim Audio speaker cable should be used to connect a
loudspeaker to the output of the NAP 300. 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 300