Naim-audio NAP 500 Manuel d'utilisateur télécharger pdf (Page 9)

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

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15

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Naim-audio NAP 500 Manuel d'utilisateur Page 9

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