NAIM NAP 150 - ISSUE 1 User manual

OWNERS MANUAL
Power amplifiers: NAP 500, NAP 300, NAP 250, NAP V145, NAP 200, NAP 150, NAP V175
ISSUE 1
WORLD CLASS HI FI

1
2 Cables and Connections
Please do not modify the standard interconnect cables
supplied with your Naim equipment. This is important for
safety as well as performance. One end of each cable is
marked with a band to establish its correct orientation.
The band always marks the end that connects to the
signal source.
Loudspeaker leads are also very important. Naim
loudspeaker cable is correct for your system and your
dealer will make up leads to suit your equipment
installation. The leads should each be at least 3.5 metres
long and of equal length. The recommended maximum is
20 metres. Loudspeaker leads are, like interconnect leads,
directional, and should be connected so that the printed
arrow points towards the speakers. Using alternative
loudspeaker cable will degrade performance, and may even
damage your amplifier. An exception to these loudspeaker
cable constraints is the NAP 6-50 multi-room power
amplifier. The NAP 6-50 is designed to be tolerant of both
a wide variety of cable types, and cable runs well in excess
of 20m. The loudspeaker connectors supplied with all Naim
amplifiers and loudspeakers have been specifically
designed to make a robust mechanical connection. It is
essential that these are used in order to comply with
current European safety regulations.
All the plugs and sockets supplied with your Naim
equipment have been chosen because they make the best
possible connection for their purpose. A poor contact will
degrade the signal substantially and plugs and sockets
should look clean and free from corrosion. The easiest way
to clean them is to switch off the equipment, pull the plugs
out of their sockets, and push them back in again. Special
contact cleaners and contact enhancers should not be
used as they tend to deposit a film which is very difficult to
remove and may degrade the sound.
1 Equipment Installation
Normally your Naim equipment will have been installed by the dealer who sold it to you
even if you live outside their immediate vicinity. Your dealer is responsible for making
sure that the system sounds exactly as it should and information given here is not
intended to reduce this responsibility in any way.
Introduction
Naim Audio products are always conceived with performance as the
top priority and careful installation will help ensure that their full
potential is achieved. This manual begins with statutory safety
warnings and general installation tips for all Naim Audio products.
Product specific information begins in Section 6.
3 Getting Started
3.1 switching on and off
Source components and power supplies for cd players,
tuners, preamplifiers and crossovers should be switched
on before switching on the power amplifier(s). Always
switch the amplifier(s) off and wait about a minute for
the power supply capacitors to discharge before
connecting or disconnecting any leads. Always use the
power switch on the product rather than a mains outlet
switch.
3.2 running in
Your Naim equipment will take a considerable time to run
in before it performs at its best. The duration varies, but
under some conditions you will find that the sound
continues to improve for as much as five weeks. Better and
more consistent performance will be achieved if the system
is left switched on for long periods. It is worth remembering
however that all electronic equipment can be damaged by
lightning. Please read the warnings section.
CONTENTS
Page Section
1 1 Equipment Installation
1 2 Cables and
connections
1 3 Getting Started
3.1 switching on and off
3.2 running in
23.3 mains supply
3.4 siting the equipment
3.5 if you have a problem
2 4 Warnings
3 5 Connection
5.1 mains lead
5.2 non-rewireable mains
plugs
5.3 fuse carrier
5.4 plug fuses
4 6 NAP 500
5 7 NAP 500 Connection
and Specifications
6 8 NAP 300
7 9 NAP 300 Connection
and Specifications
8 10 NAP 250
9 11 NAP 250 Connection
and Specifications
10 12 NAP V145
11 13 NAP V145 Connection
and Specifications
12 14 NAP 200 & NAP 150
13 15 NAP 200 & NAP 150
Connection and
Specifications
14 16 NAP V175
15 17 NAP V175 Connection
and Specifications
16 Standards Declaration

2
3.3 mains supply
Where fused plugs are used 13 amp fuses should be fitted.
Fuses of a lower rating will fail after a period of use.
A hi-fi system usually shares a mains circuit with other
household equipment some of which can cause distortion
of the mains waveform. In some Naim equipment such
distortion can lead to a mechanical hum from the
transformers. The hum is not transmitted through the
speakers and has no effect on the performance of the
system but is purely local to the transformer itself. A
separate fused mains circuit (like that reserved for electric
cookers) may reduce transformer hum. Such a circuit
(ideally with a 30 or 45 Amp rating) will also have a lower
impedance, supply cleaner power, and consequently
improve system performance.
Do not wire voltage dependent resistors or noise
suppressors into mains plugs. They degrade the mains
supply and the sound.
3.4 siting the equipment
Power supplies and amplifiers should be located a
reasonable distance away from other equipment. This
separation will stop transformer radiation causing hum
audible from the loudspeakers. The maximum separation
distance for connected equipment is that allowed by the
standard interconnect lead.
Some Naim equipment is extremely heavy. Ensure that your
equipment rack or table can easily support the weight and
is stable.
3.5 if you have a problem
Legal consumer protection varies from country to country.
In most territories a dealer must be prepared to take back
any Naim equipment he has sold you if he cannot make it
work to your satisfaction in your own home. A problem may
be due to a fault in any part of the system or its
installation so it is essential to make full use of your local
dealer’s diagnostic skills on site. Please contact your local
distributor, or Naim at the address in the back of this
manual, if any difficulties cannot be resolved. Some Naim
equipment is made in special versions for different
territories and this makes it impracticable to arrange
international guarantees. Please establish the guarantee
arrangements with your own dealer at the time of sale. We
are always available to offer help and advice.
It is essential that repairs and updates are only carried out
by an authorised Naim dealer, or at the factory by Naim
itself. Many components are made, tested or matched
specially for Naim and appropriate replacements are often
unobtainable from non-specialist sources.
4 Warnings
Naim equipment is designed to offer the finest sound
quality that can be achieved avoiding compromise
wherever possible. This can lead to circumstances that
may be unfamiliar. The material that follows contains
advice specifically related to Naim equipment as well as
more general warnings about the use of domestic audio
products. Please read it carefully.
The transformers in Naim power amplifiers and power
supplies may sometimes make a mechanical noise caused
by distortion of the mains waveform. Naim transformers are
large in size and have heavy gauge secondary windings
making them relatively sensitive to such distortion. A
separate mains circuit for your hi-fi system may reduce the
effect while also giving an overall improvement in sound
quality. It may be necessary however to take account of
mechanical transformer noise when siting your equipment.
IMPORTANT
In order to comply with
current European safety
regulations it is essential
that the Naim loudspeaker
connectors supplied with
amplifiers and loudspeakers
are used.
Do not under any
circumstances allow anyone
to modify your Naim
equipment without first
checking with the factory,
your dealer, or your
distributor. Unauthorised
modifications will invalidate
your guarantee.
For your own safety do not
under any circumstances
open Naim equipment
without first disconnecting
the mains.
The following label is
attached to all mains
powered equipment:
WARNING
THIS APPARATUS
MUST BE EARTHED
Introduction

3
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. If there is a known
problem in your locality it is advisable to arrange for a
home demonstration before purchase to find out if Naim
equipment is likely to be affected. Susceptibility to radio
frequency interference is related to the wide internal
bandwidth necessary for high sound quality. Systems
incorporating moving coil phono preamplifiers and active
crossovers are more likely to suffer. A radio frequency filter
kit is available for some Naim equipment but sound quality
will be progressively compromised as more elements of the
kit are fitted. In situations of extreme radio interference
Naim equipment may be unsuitable.
Your Naim hi-fi system can be damaged by lightning. Power
amplifiers are particularly at risk and should be turned off
when there is risk of lightning strike. For complete
protection all mains plugs and any aerial cables should be
disconnected when not in use.
Equipment must not be exposed to dripping or splashing
and no objects filled with liquid, such as vases, should be
placed on the equipment.
Use of non-standard speaker cables or interconnects may
invalidate your guarantee.
5 Connection
5.1 mains lead
As the colours of the wires in the mains lead of this
apparatus may not correspond with the coloured markings
identifying the terminals in your plug proceed as follows:
The wire which is coloured GREEN-AND-YELLOW must be
connected to the terminal in the plug which is marked by
the letter E or by the safety earth symbol or coloured green
or green-and-yellow.
The wire which is coloured BLUE must be connected to the
terminal in the plug which is marked with the letter N or
coloured black.
The wire which is coloured BROWN must be connected to
the terminal in the plug which is marked with the letter L or
coloured red.
5.2 non-rewireable mains plugs
If a non-rewireable plug is cut from a mains lead (for
whatever purpose) the plug MUST be disposed of in a way
to render it totally unusable. Considerable shock hazard
exists if the cut-off plug is inserted into a mains outlet.
5.3 fuse carrier
Should the plug fuse carrier be damaged or lost, the
correct replacement must be obtained from your dealer, or
from Naim Audio direct. Do not use the plug until the fuse
carrier is replaced.
5.4 plug fuses
Replace only with ASTA or BS 1362 approved fuses.
NOTE
This equipment has been tested and found to comply with the relevant EMC and Safety
Standards, and, where applicable, also complies with the limits for a class B digital device,
pursuant to Part 15 of the FCC Rules.
These limits are designed to provide reasonable protection against harmful interference in
a residential installation. This equipment generates, uses and can radiate radio frequency
and, if not installed and used in accordance with the instructions, may cause harmful
interference to radio communications. However, there is no guarantee that interference will
not occur in a particular installation. If this equipment does cause harmful interference to
radio or television reception, which can be determined by turning off and on, the user is
encouraged to try to correct the interference by one or more of the following measures:
• Reorient or relocate the receiving antenna.
• Increase the separation between the equipment and the receiver.
• Connect the equipment into an outlet on a circuit different from that to which the receiver
is connected.
• Consult your Naim dealer or an experienced radio/TV technician for help.
Introduction

4
6.1 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. This should be the primary signal source.
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 -).
6.2 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.
NAP 500
6 Installation and Operation
The NAP 500 and NA PS500 should be installed in their final operating locations 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 NA PS500 Power Supply.
Care should be taken when siting the NAP 500 to ensure that the top and bottom
ventilation grids are not blocked e.g. by carpet if the unit is to be placed on the floor.
The NAP 500 is very 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.
6.3 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. 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.

5
NAP 500 Connection & Specifications
NA PS500 rear
-++-
Input Socket 1 Input Socket 2
to preamp power
supply. left, ch1
to preamp power
supply. right, ch2
left
speaker ch1
right
speaker ch2
7.1 NAP 500 connection to NA PS500 Power Supply
ch1 -ve -ve
nc
nc
ch 2
mains in
7.2 Specifications
NAP 500 & NA PS500
Power Output
Continuous, 8 ohms 140 Watts per channel
Transient 700VA
Quiescent Power Consumption 60VA
Voltage Gain +29dB
Input Impedance 18 kilohms
Frequency response -3dB @ 1.5Hz and 100kHz
Mains Supply: 100V. 115V. 230V - 50/60Hz
Case size (H x W x D)
NAP 500 160 x 432 x 375mm
NA PS500 87 x 432 x 314mm
Weight
NAP 500 25.0kg
NA PS500 15.4kg
1 2

6
8 Installation and Operation
The NAP 300 and NA PS300 should be installed in their final operating locations before
connecting cables or switching on. Switch on the source and preamplifier components,
with the volume turned down, before switching on the NAP 300. The NAP 300 power
button is located on the front panel on the NA PS300 Power Supply.
Care should be taken when siting the NAP 300 to ensure that the underside fan inlet
and rear outlet are not obstructed e.g by carpet in the case of the inlet.
The NAP 300 is very 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.
NAP 300
8.1 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. This should be the primary signal source.
8.2 protection notes
In the NAP 300 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.
8.3 loudspeaker cable and connectors
Only Naim Audio speaker cable should be used to connect
a loudspeaker to the output of the NAP 300. 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.

NA PS300 rear
mains in
7
NAP 300 Connection & Specifications
9.1 NAP 300 connection to NA PS300 Power Supply
left
speaker ch1
-+
right
speaker ch2
to preamp
power
supply.
right, ch2
-+
to preamp
power
supply.
left, ch1
1 2
Input Socket 1 Input Socket 2
ch1 -ve -ve
nc
nc
ch 2
9.2 Specifications
NAP 300 & NA PS300
Power Output
Continuous, 8 ohms 90 Watts per channel
Transient 500VA
Quiescent Power Consumption 27VA
Voltage Gain +29dB
Input Impedance 18 kilohms
Frequency response -3dB @ 2Hz and 70kHz
Mains Supply: 100V. 115V. 230V - 50/60Hz
Case size (H x W x D)
NAP 300 87 x 432 x 314mm
NA PS300 87 x 432 x 314mm
Weight
NAP 300 10.7kg
NA PS300 14.1kg

8
10.1 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.
10.2 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.
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.
10.3 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. 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.
NAP 250
10 Installation and Operation
The NAP 250 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 NAP 250. The NAP 250 power button is located on
the front panel.
The NAP 250 is very 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.

9
NAP 250 Connection & Specifications
11.1 NAP 250 Rear
ch2
-ve
ch 1
Input socket
mains in
11.2 Specifications
NAP 250
Power Output:
Continuous, 8 ohms 80 Watts per channel
Transient 400 VA
Quiescent Power Consumption 25VA
Voltage Gain +29dB
Input Impedance 18 kilohms
Frequency response -3dB @ 2Hz and 65kHz
Case size (H x W x D) 87 x 432 x 314mm
Mains Supply: 100V. 115V. 230V - 50/60Hz
Weight: 15.8kg
left
speaker ch1
-+
right
speaker ch2
to preamplifier
power supply
-+

10
12.1 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.
12.2 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.
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.
12.3 loudspeaker cable and connectors
Only Naim Audio speaker cable should be used to connect
a loudspeaker to the output of the NAP V145. 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.
NAP V145
12 Installation and Operation
The NAP V145 is a mono power amplifier intended for use in audio-visual home-theatre
systems.
The NAP V145 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 NAP V145. The NAP V145 power button is
located on the front panel.
The NAP V145 is very 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.

11
NAP V145 Connection & Specifications
13.1 NAP V145 Rear
-ve
i/p
Input socket
mains in
13.2 Specifications
NAP V145
Power Output:
Continuous, 8 ohms 80 Watts
Transient 400 VA
Quiescent Power Consumption 15VA
Voltage Gain +29dB
Input Impedance 18 kilohms
Frequency response -3dB @ 2Hz and 65kHz
Case size (H x W x D) 87 x 432 x 314mm
Mains Supply: 100V. 115V. 230V - 50/60Hz
Weight: 15.8kg
speaker output
to preamplifier
power supply
-+

12
14.1 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.
14.2 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.
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.
14.3 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.
NAP 200 & NAP 150
14 Installation and Operation
The NAP 200 or NAP 150 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 NAP 200 or NAP 150. The NAP 200
power button is located on the front panel. The NAP 150 power button is located on the
rear panel.
Both the NAP 200 and NAP 150 can provide power for an appropriate Naim Audio
preamplifier. The power supply output is carried on the DIN input socket.
The NAP 200 and NAP 150 are heavy and care should be taken when lifting or moving
them. Make sure that the surface they are to be placed on can support their full weight.

13
NAP 200 & NAP 150 Connection & Specifications
15.1 NAP 200 Rear
ch1
-ve
+ve
ch 2
Input socket
ch1
-ve
+ve
ch 2
Input socket
mains in
15.2 Specifications
NAP 200
Power Output:
Continuous, 8 ohms 70 Watts per channel
Transient 300 VA
Quiescent Power Consumption 11VA
Voltage Gain +29dB
Input Impedance 18 kilohms
Frequency response -3dB @ 2Hz and 65kHz
Power Supply Output 24V, 0.3A
Case size (H x W x D) 87 x 432 x 314mm
Mains Supply: 100V. 115V. 230V - 50/60Hz
Weight: 11.6kg
15.4 Specifications
NAP 150
Power Output:
Continuous, 8 ohms 50 Watts per channel
Transient 250 VA
Quiescent Power Consumption 10VA
Voltage Gain +29dB
Input Impedance 18 kilohms
Frequency response -3dB @ 3Hz and 50kHz
Power Supply Output 24V, 0.3A
Case size (H x W x D) 69.4 x 432 x 301mm
Mains Supply: 100V. 115V. 230V - 50/60Hz
Weight: 7.5kg
left
speaker ch1
-+
right
speaker ch2
to preamplifier or
power supply
-+
+- -+
15.3 NAP 150 Rear
mains
in
power to preamplifier or
power supply
left
speaker ch1
right
speaker ch2

14
NAP V175
16.1 connection notes
The mains earth grounds only the case and the
electrostatic screen within the transformer and is not
connected to the signal negative. The mains earth must
always be connected to “ground” regardless of any other
equipment used. In order to avoid hum-loops the signal
negative of the whole system should be connected to the
mains earth in one place. This should be the primary signal
source.
16.2 operation and protection
Once installed the NAP V175 is intended to remain
permanently powered up via its rear panel switch. If the
internal heatsink reaches 70°C due to prolonged running at
very high dissipation the mains supply will be interrupted
and the indicator light will go off until the amplifier has
cooled down. This may take up to thirty minutes.
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.
16.3 loudspeaker cable and connectors
Only Naim Audio speaker cable should be used to connect
a loudspeaker to the output of the NAP V175. 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.
16 Installation and Operation
The NAP V175 is a three channel power amplifier intended for use in audio-visual home-
theatre systems. The three channels provide audio power to drive a centre channel
speaker and a pair of either main front or surround channel speakers. Audio line level
input is via two 4-pin DIN sockets - one for the centre channel and one for the main or
surround pair.
The NAP V175 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 NAP V175. The NAP V175 power button is
located on the rear panel.
The NAP V175 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.

15
NAP V175 Connection & Specifications
mains
in
power to a/v processor
ch1
nc
ch2
-ve
Input Socket 2
cen
nc
nc
-ve
Input Socket 1
+- -+ -+
1 2
17.1 NAP V175 Rear
17.2 Specifications
NAP V175
Power Output:
Continuous, 8 ohms 50 Watts per channel
Quiescent Power Consumption 13VA
Channels Three
Voltage Gain +29dB
Input Impedance 18 kilohms
Frequency response -3dB @ 3Hz and 50kHz
Case size (H x W x D) 69.4 x 432 x 301mm
Mains Supply: 100V. 115V. 230V - 50/60Hz
Weight: 7.9kg
left
speaker
ch1
centre
speaker
right
speaker
ch2

16
Declaration of conformity to appropriate standards
Manufacturer
Naim Audio Limited, Southampton Road, Salisbury, England, SP1 2LN
Products
NAP 500, NA PS500, NAP 300, NA PS300, NAP 250, NAP V145, NAP 200, NAP 150, NAP V175
Safety
HD 195-S6
EN 60 065
EMC
Emissions Tested to: EN 55013 - Sound and television broadcast receivers and associated equipment
Immunity Tested to: EN55020 - Electromagnetic immunity of broadcast receivers and associated equipment
In accordance with: CISPR 16-1 - Radio disturbance and immunity measuring apparatus
CISPR 16-2 Methods of measurement of disturbances and immunity
IEC 801-2 8KV (air gap) 4KV (contact) (performance criterion B)
IEC 801-3 3V/m 20dB (performance criterion A)
IEC 801-4 1KV (AC lines) 0.5KV (signal lines) (performance criterion B)

Part No. OWMPA 12-001-0038
DRG No. NA202001-400
Naim Audio Limited, Southampton Road, Salisbury, England SP1 2LN
Telephone: [phone] Fax: [phone] www.naim-audio.com