NAIM Amplifiers, Owner'S Manual

Page: 33 / 40

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41.1 Connection 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. This should be the primary signal
source.
41.2 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.
NAP 150x
41 Installation and Operation
The NAP 150x should be installed in its final operating location before connecting
cables or switching on. Switch on the source and preamplifier components, with the
volume turned down, before switching on the power amplifier. The power button is
located on the rear panel.
The NAP 150x can provide power for an appropriate Naim Audio preamplifier. The power
supply output is carried on the DIN input socket.
The NAP 150x 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 its 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.
41.3 Loudspeaker Cable and Connectors
Only Naim Audio speaker cable should be used to connect a
loudspeaker to the output of the amplifier. Custom Naim Audio
loudspeaker connectors are supplied to make the connection.
IN ORDER TO COMPLY WITH CURRENT EUROPEAN SAFETY
REGULATIONS IT IS ESSENTIAL THAT THESE ARE USED.
DAMAGE TO THE AMPLIFIER MAY RESULT IF “HIGH
DEFINITION” CABLE OR ANY OTHER SPECIAL CABLE IS USED
TO CONNECT THE LOUDSPEAKERS.
42 NAP 150x Rear
43 NAP 150x Specification
Power Output: 50 Watts per channel, 8
Ω
250 VA Transient
Quiescent Consumption: 10VA
Voltage Gain: +29dB
Input Impedance: 18k
Ω
Frequency Response:
-3dB @ 3Hz and 50kHz
Power Supply Output: 24V, 0.25A
Dimensions (H x W x D): 70 x 432 x 301mm
Weight 7.5kg
Mains Supply: 100-120V or 220-240V, 50/60Hz
mains input
and fuse
right
speaker
left
speaker
signal input
ch1 & ch2 and
preamp power supply
ch2 ch1
24V 24V
0.25A 0.25A
Input/Preamp
Power Socket
-ve
power
switch
Power Amplifier