Naim-audio NAP 500 User Manual download pdf (Page 39)

E37

37.1 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.

37.2 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.

37 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.

37.3 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 Power Amplifier

39 NAP 250 Specification

Power Output: 80 Watts per channel, 8Ω

400 VA Transient

Quiescent Consumption:

25VA

Voltage Gain:

+29dB

Input Impedance:

18kΩ

Frequency Response: -3dB @ 2Hz and 65kHz

Dimensions (H x W x D): 87 x 432 x 314mm

Weight 15.8kg

Mains Supply: 100-120V or 220-240V, 50/60Hz

ch2

-ve

ch1

Input

mains input

and fuse

signal input

ch1(L) & ch2(R)

38 NAP 250 Connections

38.1 NAP 250 Rear

left

speaker

right

speaker

1 2 ... 34 35 36 37 38 39 40 41 42 43 44

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Naim-audio NAP 500 User Manual Page 39

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