Bedienungsanleitung Naim NAP 250 DR (Seite 35 von 44) (Englisch)

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E33

NAP 500 Power Amplifier

31.1 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.

Note: Each channel of the NAP 500 is a “bridged”

amplifier, so none of the speaker outlet sockets (+ or -)

is 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 -).

31.2 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.

31 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.

31.3 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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