Naim NAP 500, NAP V145, NAP 300, NAP 250, NAP 200 User Manual
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Reference Manual – English
POWER AMPLIFIERS
NAP 500 • NAP 300 • NAP 250 • NAP V145
NAP 200 • NAP 155 XS • NAP 100
Contents
Section Page
Introduction E1
1. Connections E1
2. Mains Power E1
3. General Installation E2
NAP 500 E3
4. NAP 500 Installation and Operation E3
5. NAP 500 Connections E4
NAP 300 E5
6. NAP 300 Installation and Operation E5
7. NAP 300 Connections E6
NAP 250 E7
8. NAP 250 Installation and Operation E7
9. NAP 250 Connections E7
NAP V145 E8
10. NAP V145 Installation and Operation E8
11. NAP V145 Connections E8
NAP 200 E9
12. NAP 200 Installation and Operation E9
13. NAP 200 Connections E9
NAP 155 XS E10
14. NAP 155 XS Installation and Operation E10
15. NAP 155 XS Connections E10
NAP 100 E11
16. NAP 100 Installation and Operation E11
17. NAP 100 Connections E11
18. Specications E12
19. Diagram Icons E12
20. Declarations of Conformity E13
21. Statutory Safety Warnings E13
Introduction
Naim Audio products are conceived with performance as the top priority. Careful installation will
help ensure that their full potential is achieved. This manual covers all power amplifiers. It begins
with some general installation notes. Product specific information begins in Section 4.
Note: Please read
the Statutory Safety
Warnings found at the
end of this manual.
1. Connections
It is important for both safety and performance that the
standard cables supplied are not modied.
1.1 Interconnect Cables
If options are available with your equipment and installation,
DIN interconnect sockets should be used in preference to
RCA Phono sockets. One end of each Naim interconnect
cable is marked with a band to establish its correct
orientation. The band denotes the end that connects to the
signal source. Naim Hi-Line interconnect cable will provide
the best results.
Interconnect plugs and sockets should be kept clean
and free from corrosion. The easiest way to clean them
is to switch o the equipment, pull the plugs out of their
sockets, and push them back in again. Contact cleaners and
“enhancers” should not be used as the lm they deposit may
degrade the sound.
1.2 Loudspeaker Cables
Loudspeaker cables are vitally important. They should
each be at least 3.5 metres long and of equal length. The
recommended maximum is normally 20 metres although
longer cables may be viable with some Naim ampliers.
2.1 Mains Plug Wiring
In some territories a mains plug may need to be tted to
the supplied mains lead. As the colours of the wires in the
mains lead may not correspond with the coloured markings
identifying the terminals in the plug proceed as follows:
The wire coloured GREEN-AND-YELLOW must be connected
to the terminal in the plug marked by the letter E or by
the safety earth symbol or coloured GREEN or GREEN and
YELLOW.
The wire coloured BLUE must be connected to the terminal
in the plug marked with the letter N or coloured BLACK.
The wire coloured BROWN must be connected to the
terminal in the plug marked with the letter L or coloured
RED.
2.2 Equipment Fuses
Mains powered Naim Audio equipment is tted with a mains
fuse on the rear panel adjacent to the mains input socket.
Replace it if necessary only with the spare fuse supplied or
with an identical fuse. Repeated failure of the fuse points to
a fault that should be investigated by your retailer or Naim
itself.
2.3 Non-rewirable Mains Plugs
Some Naim ampliers are designed only to work with Naim
loudspeaker cable and using alternatives may degrade the
performance or even damage the amplier. Other Naim
ampliers can be used with any high quality loudspeaker
cable although we recommend that Naim loudspeaker cable
is used. Naim loudspeaker cable is directional and should
be oriented so that the printed arrow points towards the
speakers. The Naim loudspeaker connectors supplied are
designed to comply with European safety legislation and
must be used.
Contact your local retailer or distributor for further advice
on loudspeaker cables and connectors.
2. Mains Power
Use only the mains leads and plugs supplied or the Naim
PowerLine mains cable.
Where fused plugs are used 13 amp fuses should be tted.
Fuses of a lower rating will fail after a period of use. Do not
wire voltage dependent resistors or noise suppressors into
mains plugs. They degrade the mains supply and the sound.
If a non-rewirable plug is cut from a mains lead (for
whatever purpose) the plug MUST be disposed of in a way
to render it totally useless. Considerable shock hazard exists
if the cut-o plug is inserted into a mains outlet.
2.4 Mains Circuits and Cables
A hi- system usually shares a mains circuit with other
household equipment some of which can cause distortion
of the mains waveform. This distortion can in turn lead
to mechanical hum from mains transformers. Some Naim
transformers are large in size, making them relatively
sensitive to such distortion, and it may be necessary to take
account of transformer hum when siting your equipment.
Transformer hum is not transmitted through the speakers
and has no eect on the performance of the system;
however, a separate mains circuit may reduce it. Such a
circuit (ideally with a 30 or 45 Amp rating) will also generally
improve system performance. Advice on the installation of
a separate mains circuit should be sought from a qualied
electrician.
E1
3. General Installation
Naim equipment is designed to oer the nest performance
possible avoiding compromise wherever practical. This can
lead to circumstances that may be unfamiliar. The notes that
follow contain advice specically related to Naim equipment
as well as more general warnings about the use of domestic
audio products. Please read them carefully.
3.1 Siting The Equipment
In order to reduce the risk of hum audible from the
loudspeakers, power supplies and power ampliers
should be located a reasonable distance away from
other equipment. The maximum separation distance for
connected equipment is that allowed by the standard
interconnect lead.
Some Naim equipment is extremely heavy. Check the
weight of the equipment prior to lifting and if necessary use
more than one person so that it can be moved safely. Ensure
that your equipment rack or table can easily support the
weight and is stable.
3.2 Switching On
Source components and power supplies should be switched
on before the power ampliers. Always switch ampliers o
and wait a minute before connecting or disconnecting any
leads. Always use the power switch on the product rather
than a mains outlet switch.
A “thump” may be heard from the loudspeakers as power
ampliers are switched on. This is normal, will not cause
any loudspeaker damage and does not point to any fault
or problem. A mild “pop” may also be heard shortly after
equipment is switched o.
3.3 Running In
Naim equipment takes a considerable time to run in before
it performs at its best. The duration varies, but under some
conditions the sound may continue to improve for over a
month. Better and more consistent performance will be
achieved if the system is left switched on for long periods.
It is worth remembering however that equipment left
connected to the mains can be damaged by lightning.
3.5 Lightning Precautions
Your Naim hi- system can be damaged by lightning and
should be turned o and disconnected from the mains when
there is risk of lightning strike. For complete protection all
mains plugs and any aerial cables should be disconnected
when not in use.
3.6 Problems?
Consumer protection varies from country to country. In
most territories a retailer must be prepared to take back
any equipment he has sold if it cannot be made to work
satisfactorily. A problem may be due to a fault in the
system or its installation so it is essential to make full use
of your dealer’s diagnostic skills. Please contact your local
distributor, or Naim Audio directly, if any diculties cannot
be resolved.
Some Naim equipment is made in special versions for
dierent territories and this makes it impracticable to
arrange international guarantees. Please establish the local
guarantee arrangements with your retailer. Contact Naim
Audio directly for help and advice if necessary.
3.7 Service and Updates
It is essential that repairs and updates are only carried
out by an authorised Naim retailer or at the factory by
Naim itself. Many components are custom made, tested
or matched and appropriate replacements are often
unobtainable from other sources.
Direct contact to Naim for service or update information
should be made initially through Customer Services:
Tel: +44 (0)1722 426600
Email: info@naimaudio.com
Please quote the product serial number (found on its rear
panel) in all correspondence.
3.4 Radio Interference
In some circumstances, depending on where you live
and the earthing arrangements in your home, you may
experience radio frequency interference. Controls on
broadcasting in some territories allow very high levels of
radio frequency radiation and both the choice and exact
siting of equipment may be critical. Susceptibility to radio
frequency interference is related to the wide internal
bandwidth necessary for high sound quality. A radio
frequency lter kit is available for some Naim equipment but
sound quality will be progressively compromised as more
elements of the kit are tted.
E2
NAP 500
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 nal location before connecting cables or switching on. Switch on the source and preamplier 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.
4.1 General Connections Notes
The mains earth (ground) should always be connected
regardless of what other equipment is used in conjunction
with Naim power ampliers. 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”
amplier, 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 oating
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 amplier dissipation. If the amplier reaches
70°C due to prolonged running at high level or to airow
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.
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 amplier ends of the cable is the same
for both channels.
It is not necessary to switch the amplier o, but it may be
advisable to mute the preamplier 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.
E3
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