NAIM 200 Series User manual

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User Guide
POWER AMPLIFIER - NAP 250

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Contents
Section Page
Introduction 1
1. What’s In The Box 1
2. Features and Connections 2
3. Set Up 3
4. Tips on Installing and Using 6
5. Mains power, Earthing and More 8
6. Further Tips and Advice 9
7. Support 10
8. Service and Updates 10
9. Specications 10
10. Product Recycling 10

1
Welcome to your new Naim power amplifier. Like all Naim Audio
products, the NAP 250 puts musical performance first. To help realise its
full potential, it is important to follow the simple installation and usage
guidelines covered in this manual. We start with some product and set-up
essentials, before moving onto more detailed information in Section 4.
Introduction
1. What’s in the box
Please Note: Full safety
warnings can be found in
the Statutory Safety Manual.
1xNAP 250
1xDocument Pack 1xCleaning Cloth 1xPower-Line Lite
2xXLR – XLR Balanced
Audio Interconnect
1xOptical System
Automation Cable
2xSpeaker Connectors
(pre-installed to unit)

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2. NAP 250 Features and Connections
Power/Standby
button
Instant On/Auto
Standby Switch
Remote out Speaker sockets
USB upgrade
Balanced XLR
inputs
Remote In
Mains input
& fuse
Brightness/
Reset button
8 step intelligent
fan control
Dimmable,
backlit logo

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3. NAP 250 Set Up
Your NAP 250 needs to be connected to a preamplier (such as the matching
NSC 222), but before you do, please ensure both components are in their nal
positions and disconnected from mains power.
For optimum performance, use a dedicated hi- support – ideally Naim Fraim –
with the preamplier sited above the power amplier, as shown.
Ensure all equipment is o before connecting.

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Connect the two supplied XLR cables from the balanced XLR outputs of
your preamplier to the balanced input of the NAP 250. Ensure the cables
are channel-matched: the pre-amplier left output connected to the power
amplier left input etc. More in section 4.2.
Please ensure that the XLR plugs are inserted correctly, which is achieve with
the Naim logo on the plug facing upwards.
If you are using the NAP 250 with matching Naim preamplier (see section
4.4), connect the supplied system automation cable to the preamplier’s
Remote Out terminal.
Connect the other end of the system automation cable to the Remote In
terminal on the NAP 250.

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Connect speaker cables to the NAP 250, ensuring each is connected to the
correct speaker and both are in phase.
For more detailed guidance, see section 4.3.
Finally, connect the mains lead to the NAP 250. See section 7 for more on
mains power.

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Checking rst that the volume is turned down on any connected preamplier,
then power up the NAP 250. If you have made the system automation
connection to a Naim preamplier, the NAP 250 will automatically power up
along with your preamp. If you are using a dierent preamplier, press the
Power button on the front panel of the NAP 250.
4. Tips on Installing and Using Your NAP 250
We know you are eager to enjoy your new NAP 250, but we promise it will
sound even better once you have followed these guidelines, all designed to
help you experience your power amplier without compromise.
4.1 Unboxing and positioning
Your NAP 250 uses high-quality components, including a substantial power
transformer and durable aluminium casing. That means the NAP 250 weighs in
at 16.8 kg, so please take care when lifting or moving it, and ensure the surface
you plan to place it on is stable and can support its weight.
For optimum performance, use your Naim products on a dedicated hi-
equipment rack – ideally the Naim Fraim or Fraim Lite – to minimise vibrations
that can aect sound. No room for a rack? Consider placing your NAP 250 on
a Fraim glass shelf on a suitable piece of furniture, to provide solid but discreet
support.
Your NAP 250 features fan-assisted cooling, designed to activate when your
amplier runs at high volumes for a sustained time. Please ensure the heat
outlet is not covered; we would not recommend using the NAP 250 in a closed,
non-vented cabinet.
Never stack Naim products on top of each other, and if you are placing them
side-by-side, please leave some distance between the units. Equally, connected
products should not sit too far apart: the maximum separation distance is that
allowed by the supplied interconnect lead.
To reduce the risk of audible hum from the loudspeakers do not place power
supplies or power ampliers close to source components.

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4.2 Input Connection Details
The NAP 250 features industry standard XLR balanced inputs for audio.
Balanced connections are a low-noise solution and are able to run over long
distances – enabling more exible placement of the NAP 250.
Adapter cables are available to allow you to connect the NAP 250 to
preampliers with RCA or DIN outputs.
4.3 Loudspeaker Cable and Connectors
For optimum performance, use Naim NAC A5 or Super Lumina speaker cable,
connected in the correct direction (for example, NAC A5 printed arrows
pointing toward the loudspeaker).
It is important your pair of speaker cables are both the same length, up to a
recommended maximum of 20m. Unlike some earlier Naim designs, we do not
mandate a minimum speaker cable length, but would still suggest you avoid
sub-2m lengths.
Your NAP 250 comes with custom Naim Audio loudspeaker connectors – these
provide the best, impedance-matched electrical connection, and ensure your
amplier complies with current safety regulations.
Ensure when connecting speakers that they are ‘in phase’ – meaning
the amplier’s positive loudspeaker output is connected to the positive
loudspeaker input – and that the left and right outputs go to the correct
speaker.
4.4 System Automation
When using the NAP 250 with a compatible preamplier – such as the NSC222
– you can synchronise power on/o and logo brightness across your system
by connecting the two with the supplied Optical System Automation Cable.
Simply plug the cable from the ‘Remote Out’ terminal of the preamplier to
the ‘Remote In’ terminal on the NAP 250. It is possible to link further power
ampliers using the ‘Remote Out’ terminal of the NAP 250.
If you require a longer distance between your preamplier and the NAP
250 than the supplied cable allows for, you can use a replacement 3.5mm to
3.5mm optical cable to the required length. It is also possible to use standard
analogue cables with 3.5mm connectors, but an optical cable oers the best
performance.
4.5 Powering Up/Down
Once all your input and output connections are made, connect the supplied
mains lead to your NAP 250 and to mains power. Please note: your source -
such as a streamer or CD player – and any associated external power supplies
should be switched on before you switch on your NAP 250.
Positive/
Hot
Ground
Negative/
Cold

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You can now power up the NAP 250 either by turning on your Naim
preamplier – connected via System Automation – or by simply pressing the
power button on the front panel of the power amplier.
It is the same procedure to switch o your NAP 250: turn o your Naim
preamplier – connected via System Automation – or simply press the power
button on the front panel of the power amplier, which will put it into standby.
Avoid using a mains outlet switch to turn your amplier o.
4.6 Standby Power Settings
By default, the NAP 250 is set to ‘Auto Standby’ - it automatically enters
Standby mode (where it consumes less than 0.5W of power) after 19 minutes
of inactivity. Music Sensing will wake the amp from Standby when it detects an
input signal.
For the optimum sound quality, switch the Standby setting on the rear panel to
‘Instant on’, which keeps all sensitive audio circuits permanently powered up.
Please note Music Sensing is disabled when it receives a system automation
command; if the NAP 250 is manually put into Standby via the Standby button,
or when ‘Instant On’ is enabled.
4.7 Naim Logo Brightness Settings
You can choose the brightness level of the Naim logo on your NAP 250. If you
are using a Naim preamplier connected via System Automation, you can
synchronise the brightness of both logos from the preamp. Alternatively, you
can set the NAP 250 via the brightness toggle switch on the rear panel.
PLEASE NOTE: the brightness button also functions as a full NAP 250 reset
button when it is pressed for 3 seconds, so it is best to make your logo
brightness choices quick and decisive!
4.8 USB Update
Your NAP 250 has a micro USB terminal, but this is for service use only.
5. Mains power, Earthing and More
Use only the main leads and plugs supplied with your NAP 250, or the upgrade
Naim Power-Line mains cable. Where fused plugs are used, 13 amp fuses
should be tted. Do not wire voltage dependent resistors or noise suppressors
into mains plugs; they degrade the mains supply and the sound.
5.1 Earthing
In order to avoid hum loops, the signal ground of the whole system should
be connected to the mains earth in one place. Typically, this is at the primary
source. For example, a Naim streamer has a ground lift switch. Set this to
“default” if no other source connects mains earth to signal ground. This setting
will give best sound quality.
5.2 Non-rewirable Mains Plugs
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.

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5.3 Mains Circuits and Interference
A hi- system usually shares a mains power circuit with other household
equipment, some of which can cause distortion that may manifest as
mechanical hum from mains transformers, including the large transformer in
your NAP 250.
Transformer hum is not transmitted through the speakers and has no eect
on the performance of the system; however, careful positioning of your Naim
system may reduce it, as may a separate, dedicated mains circuit. Such a
circuit (ideally with a 30 or 45 Amp rating) will also generally improve system
performance. Only seek advice on the installation of a separate mains circuit
from a qualied electrician.
5.4 Lightning Precautions
Your Naim system should be turned o and fully disconnected from mains
power when there is a risk of a lightning strike, to protect from potential
damage.
6. Further Tips and Advice
Now you have all the essentials sorted, let us move onto a few more things
that you can do to optimise the performance of your new NAP 250.
6.1 Running In
Naim products are hand-crafted from a carefully selected range of high-
quality components. Your NAP 250 will sound superb out of the box, but
its performance may improve further still as all these various components
power up and interact in their first few weeks of use. Keeping your system
powered up will assist this process.
6.2 Cleaning Your Product and Connections
Naim recommends using only the supplied cleaning cloth to lightly dust
any product surfaces. Cleaning products may contain ingredients that can
adversely aect cosmetic surface treatments and coatings.
Keep interconnect plugs and sockets clean and free from corrosion. The
easiest way to achieve this is to fully power o your Naim product (and any
connected equipment), unplug all connections from their sockets and rmly
push them in again. Contact cleaners and so-called ‘enhancers’ should not be
used, as they can leave deposits that can degrade the sound of your system.
6.3 Resetting your NAP 250
To reset your NAP 250 to default settings, press the ‘Brightness’ button on the
rear panel for 3 seconds.

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7. Support
Consumer protection varies from country to country. In most territories, the
retailer you bought your Naim product from should be your primary contact if
you are experiencing problems with your unit. 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.
You can nd a range of support articles for each Naim product online at
Naimaudio.com
If you are still experiencing an issue with your Naim product, contact us directly
for help and advice, at [email protected]om
8. Service and Updates
Any repairs or hardware updates should only be made by an authorised
Naim service centre or at the Naim HQ itself. Many components are
custom made, tested or matched and appropriate replacements are often
unobtainable from other sources. Please contact your local Naim retailer
with any service or repair queries.
9. Specifications
10. Product Recycling
Products that display the crossed-out wheeled bin logo cannot be disposed of
as domestic waste. These products must be disposed of at facilities capable of
recycling them and appropriately handling any waste by-products.
Contact your local authority for details of the nearest such facility.
Appropriate recycling and waste disposal helps conserve resources and
protects the environment from contamination.
200 Series Power Amplier - NAP 250
Power output: 100 Watts per channel, 8
Idle consumption: 26W
Voltage gain: +29dB
Input impedance: 47k balanced / 34k singled ended via adaptor lead
Frequency response: -3dB @ 1.4Hz and 100kHz
Power supply output: None
Dimensions (H x W x D): 91.5 × 432 × 317.5 mm (including feet)
Weight: 16.8kg
Mains supply: 115V or 230V, 50/60Hz

Table des matières
Section Page
Introduction 1
1. Liste des éléments fournis 1
2. Caractéristiques et ports de connexion 2
3. Mise en place 3
4. Conseils pour l’installation et l’utilisation 6
5. Alimentation secteur, mise à la terre et plus 8
6. Autres astuces et conseils 9
7. Support 9
8. Réparation et mises à jour 9
9. Spécications 10
10. Consignes de recyclage du produit 10

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Bienvenue et félicitations pour l’achat de votre nouvel amplificateur de
puissance Naim. Comme tous les produits Naim Audio, le NAP 250 donne
la priorité absolue à la performance musicale. Pour l’aider à déployer
tout son potentiel, il est important de suivre les consignes simples pour
l’installation et l’utilisation qui sont fournies dans ce manuel. Nous allons
commencer par quelques informations de base concernant le produit et
la mise en place, avant de passer à des informations plus détaillées à la
section 4.
Introduction
1. Liste des éléments fournis
À noter : tous les
avertissements de sécurité
se trouvent dans le manuel
de sécurité agréé.
1xNAP 250
1xDocumentation 1xChion de nettoyage 1xCâble d’alimentation
2x Interconnexion audio
symétrique XLR – XLR
1xCâble d’automatisation
système optique
2xConnecteurs d’enceinte
(pré-installés sur l’appareil)

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2. Caractéristiques et ports de connexion
Bouton de
marche-arrêt/veille
Bouton de
démarrage
immédiat/mise en
veille auto
Sortie à
distance
Prises
d’enceinte
Mise à niveau USB
Entrées XLR
symétriques
Entrée commande
à distance
Entrée secteur
et fusible
Bouton de réglage de la
luminosité/réinitialisation
Commande
de ventilation
intelligente
en 8 étapes
Logo à variation
d’intensité,
rétroéclairé

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3. NAP 250 Mise en place
Votre NAP 250 doit être raccordé à un préamplicateur (tel que le NSC 222
correspondant) mais, avant de le faire, vous devez vous assurer que les deux
composants se trouvent à leur emplacement dénitif et sont débranchés du
secteur.
Pour des performances optimales, utilisez un support hi- dédié (idéalement
Naim Fraim) et placez le préamplicateur au-dessus de l’amplicateur de
puissance, comme illustré.
Avant de procéder au raccordement, vériez que tous les équipements sont
éteints.

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Branchez les deux câbles XLR fournis entre les sorties XLR symétriques de votre
préamplicateur et l’entrée symétrique du NAP 250. Vériez que les câbles
sont bien appariés : la sortie gauche du préamplicateur avec l’entrée gauche
de l’amplicateur de puissance, etc. Pour plus d’informations, se reporter à la
section 4.2. Veillez à ce que les ches XLR soient insérées correctement, ce qui
est le cas quand le logo Naim de la che est vers le haut.
Si vous utilisez le NAP 250 avec un préamplicateur Naim correspondant (voir
section 4.4), raccordez le câble d’automatisation système fourni avec le port de
sortie à distance du préamplicateur.
Branchez l’autre extrémité du câble d’automatisation système au port d’entrée
à distance du NAP 250.

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Branchez les câbles d’enceinte au NAP 250, en veillant à ce que chacun soit
raccordé à la bonne enceinte et à ce que les deux soient en phase.
Pour des consignes plus détaillées, voir section 4.3.
Enn, branchez le câble d’alimentation au NAP 250. Pour en savoir plus sur
l’alimentation secteur, voir section 7.