E3
NAP 500
4.1 General Connections Notes
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.
Note: Each channel of the NAP 500 is a “bridged” amplifier, so
none of the speaker outlet sockets (+ or -) are at earth potential.
Avoid connecting mains powered equipment such as electrostatic
speakers, sub-woofers and headphone energisers that do not
have a floating earth. No plug which is connected directly or
indirectly to earth potential should be attached to any speaker
outlet (+ or -).
4.2 Protection Notes
In the NAP 500 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.
4 NAP 500 Installation and Operation
The NAP 500 and NAP 500PS 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 500. The NAP 500 power button is located on the front panel of the
NAP 500PS Power Supply.
Care should be taken when siting the NAP 500 to ensure that the top and bottom ventilation
grids are not blocked.
The NAP 500 and NAP 500PS are very 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.
4.3 Loudspeaker Cable and Connectors
Only Naim Audio speaker cable should be used to connect a
loudspeaker to the output of the NAP 500. 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.
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