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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 
integrated amplifiers. It begins with some general installation notes. Product specific 
information begins in Section 4.

Introduction

1  Connections

It is important for both safety and performance that 
the standard cables supplied are not modified.

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 off 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 film 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 amplifiers.

Some Naim amplifiers are designed only to work with 
Naim loudspeaker cable and using alternatives may 
degrade the performance or even damage the amplifier. 
Other Naim amplifiers 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

Where fused plugs are used 13 amp fuses should be 
fitted. 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.

2.1  Mains  Plug  Wiring

In some territories a mains plug may need to be fitted 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 fitted 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 

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-off plug is inserted into a mains outlet.

2.4  Mains  Circuits  and  Cables

A hi-fi 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 effect 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 qualified electrician.

Use only the mains leads and plugs supplied or the Naim 
PowerLine mains cable.

Note: Please read the 
Statutory Safety Warnings 
found at the end of this 
manual.

Summary of Contents for NAIT 5si

Page 1: ...R E F E R E N C E M A N U A L I N T E G R A T E D A M P L I F I E R S S U P E R N A I T 2 N A I T X S 2 N A I T 5 s i ENGLISH ...

Page 2: ...2 Introduction Installation and Connection 10 9 1 Mains Power Connection 10 9 2 Signal Inputs 10 9 3 Speaker Outputs 10 9 4 av and hdd Outputs 10 9 5 Headphone Output 10 9 6 AV Bypass 11 9 7 Other Signal Inputs and Outputs 11 9 8 Power Supply Upgrades 11 9 9 General Connections Notes 11 9 10 External Control and Interface 11 10 Controls and Connections 12 10 1 Front Panel Controls 12 10 2 Rear Pan...

Page 3: ...e Do not wire voltage dependent resistors or noise suppressors into mains plugs They degrade the mains supply and the sound 2 1 Mains Plug Wiring In some territories a mains plug may need to be fitted 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...

Page 4: ...stances 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 so...

Page 5: ... socket on the rear panel The aux 2 DIN socket also carries a power supply output intended to power a Naim Stageline or SuperLine phono preamplifier Note For optimum sound quality DIN sockets should be used in preference to RCA phono sockets Note Where an input has DIN and phono socket options only one should be connected at any one time Always use high quality interconnect cables to connect sourc...

Page 6: ...iers that require an external power supply The Supernait 2 DIN bi amp output socket provides a preamp output signal that enables a second power amplifier to be used in conjunction with the Supernait 2 power amplifier The RCA phono sub out sockets provide a stereo output intended for connection to an active subwoofer The output signal is a duplicate of the preamplifier output No low pass filtering ...

Page 7: ...ink plug fitted av in out hdd in out tuner in cd in ch1 ve nc nc ch2 cd and tuner Inputs ch1 ve ch1 out ch2 out ch2 av and hdd Inputs ve ve ve ch1 ch2 aux 2 input sub out aux 1 in RCA av in RCA hdd in RCA tuner in RCA cd in RCA bi ampout Note The link plug should be removed only if a power supply upgrade is to be used or an alternative preamplifier is to use the Supernait 2 power amplifier section...

Page 8: ...fuse power mains input and fuse power 6 System Connections The following three diagrams illustrate examples of Supernait 2 system connections Many other systems using external power supplies or additional power amplifiers are possible Contact your Naim retailer or local distributor for more information Note The Supernait 2 should remain connected to mains power at all times Note The Supernait 2 sh...

Page 9: ...upply and NAP 200 Power Amplifier cable direction marker 4 to 4 pin DIN Interconnect Cables 240 5 to 5 pin DIN mains input and fuse power mains input and fuse mains input and fuse Note The Supernait 2 should remain connected to mains power at all times ...

Page 10: ...de automatically if no control commands are received for five minutes Note In a few cases some further equipment configuration may be required for auto switching to operate correctly Please contact your retailer or local distributor for advice 7 2 Handset Volume and Balance Control The remote handset volume and balance keys provide some alternative control characteristics A short press and release...

Page 11: ...Ω to 1kΩ headphones Auxiliary Power Output 24V on aux 2 in pwr for Naim phono stages Fixed Line Level Outputs av out and hdd out Variable Line Level Outputs sub out bi amp out and pre amp out Quiescent Consumption 37VA Dimensions H x W x D 87 x 432 x 314mm Weight 13 9kg Mains Supply 100V 115V or 230V 50 60Hz For full technical specifications please visit our website http www naimaudio com hifi pro...

Page 12: ... labelled cd tuner hdd hard disk drive av aux 1 and aux 2 The cd tuner hdd and av input buttons correspond to parallel DIN and RCA phono input sockets on the rear panel while the aux 1 input button corresponds only to a pair of RCA phono sockets Note The hdd and av sockets carry both inputs and outputs See Section 9 4 for more information The aux 2 input button corresponds to a DIN input socket on...

Page 13: ... amp in socket carries a 24V DC power supply output intended for Naim preamplifiers that require an external power supply The RCA phono sub out sockets provide a stereo output intended for connection to an active subwoofer The output signal is a duplicate of the preamplifier output No low pass filtering is applied Diagrams 11 1 and 11 2 illustrate some applications of the Nait XS 2 preamp out and ...

Page 14: ... cd and tuner Inputs ch1 ve ch1 out ch2 out ch2 av and hdd Inputs ve ve ve ch1 ch2 aux 2 input Note The link plug should be removed only if a power supply upgrade is to be used an alternative preamplifier is to use the Nait XS 2 power amplifier section or an alternative power amplifier is to use the Nait XS 2 preamplifier section It should remain fitted in all other circumstances Note The Nait XS ...

Page 15: ... information mains input and fuse power 11 1 Nait XS 2 with FlatCap XS Power Supply mains input and fuse Note The Nait XS 2 should remain connected to mains power at all times power mains input and fuse cable direction marker 4 to 4 pin DIN Interconnect Cables 240 5 to 5 pin DIN 11 2 Nait XS 2 with Hi Cap Power Supply and NAP 200 Power Amplifier mains input and fuse power mains input and fuse Note...

Page 16: ...commands are received for five minutes Note In a few cases some further equipment configuration may be required for auto switching to operate correctly Please contact your retailer or local distributor for advice 12 2 Handset Volume Control The remote handset volume keys provide some alternative control characteristics A short press and release of a key will adjust by a preset nudge while pressing...

Page 17: ... for 16Ω to 1kΩ headphones Auxiliary Power Output 24V on aux 2 in pwr for Naim phono stages Fixed Line Level Outputs av out and hdd out Variable Line Level Outputs sub out and pre amp out Quiescent Consumption 16VA Dimensions H x W x D 70 x 432 x 301mm Weight 8 4kg Mains Supply 100V 115V or 230V 50 60Hz For full technical specifications please visit our website http www naimaudio com hifi products...

Page 18: ...s These should be used in preference to the RCA phono sockets if practical Do not connect both the DIN and RCA phono sockets of one input simultaneously 14 3 Speaker Outputs A stereo set of speaker connection sockets is provided on the rear panel The sockets can accept standard 4mm plugs but to comply with European legislation the Naim connectors supplied should be used Naim Audio speaker cable wi...

Page 19: ...mains input and fuse tuner input DIN tuner input RCA phono CD input DIN CD input RCA phono hdd in av in left speaker right speaker hdd out ch1 ve nc nc ch2 cd and tuner Inputs Note The Nait 5si features various technologies to reduce microphonic effects Some movement of the board and sockets when connecting and disconnecting cables is normal ...

Page 20: ...elect AV Bypass first switch the Nait 5si into program mode by pressing and holding the handset prog key with the handset in preamplifier mode The front panel av button will illuminate if AV Bypass is selected If it is not enabled it can be switched on by pressing av button twice The Nait 5si volume control indicator will extinguish when AV Bypass mode is engaged and the av input is selected Remot...

Page 21: ...V to 7 0V Headphones Front panel 6 3mm 1 4 jack socket suitable for 16Ω to 1kΩ headphones Fixed Line Level Outputs hdd out Quiescent Consumption 19VA Dimensions H x W x D 70 x 432 x 301mm Weight 6 8kg Mains Supply 100V 115V or 230V 50 60Hz For full technical specifications please visit our website http www naimaudio com hifi products nait 5si ...

Page 22: ... Soft Keys System Component Keys switch the operation of the Soft Keys into modes appropriate to each system component CD player preamplifier etc Global Keys operate specific component functions regardless of the System Component Key setting and are available at all times 18 1 1 Integrated Amplifier Global Keys operate as follows vol 5 6 Adjusts the volume and the volume control position mute Redu...

Page 23: ...e connected to a mains socket outlet with a protective earthing connection Warning batteries installed shall not be exposed to excessive heat such as sunshine fire or the like Where the mains plug or an appliance coupler is used as the disconnect device the disconnect device shall remain readily operable To disconnect the equipment from the mains remove the mains plug from the mains outlet The fol...

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