Naim Audio NAC-112 Owners manual

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O W N E R S M A N U A L

P r e a m p l i f i e r s

page

11.0 Equipment Installation

1.1cables and connections

22.0 Getting Started

2.1switching on and off

2.2running in

2.3mains supply

2.4siting the equipment

2.5if you have a problem

33.0 Warnings

44.0 Connection

4.1mains lead

4.2non-rewireable mains plugs

4.3fuse carrier

4.4plug fuses

5nac 52

8 nac 82

12 nac 102

15 nac 112

18 narcom 2 remote handset

1.0 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.

20EC Declaration of Conformity to Appropriate Standards

1.1 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

2.0 Getting Started

2.1 switching on and off

Source components and power supplies for cd players, tuners, preamplifiers and crossovers

should be switched on before switching on the amplifier(s). Always switch the amplifier(s)

off and wait about a minute for its 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.

2.2 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.

2.3 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.

2.4 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 minimum recommended distance is 300mm (12 inches), and that

allowed by the standard interconnect lead is the maximum.

Some Naim equipment is extremely heavy. Ensure than your equipment rack or table can

easily support the weight and is stable.

2.5 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.

2

3.0 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.

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.

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:

3

4.0 Connection

4.1 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.

4.2 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.

4.3 fuse carrier

Should the plug fuse carrier be damaged or lost, the correct replacement must be obtained

from your dealer or from Naim direct. Do not use the plug until the fuse carrier is replaced.

4.4 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.

4

nac 52 operation

power supplies

The nac 52 does not incorporate an internal power supply and can be used only in conjunction with a

supercap power supply.

listening and recording

The input selector buttons are arranged along the uppermost bank of buttons. They control which

source is to be routed to the power amplifier and the loudspeakers, for listening. Below them, in the

lower bank, are a corresponding array of buttons which choose the source component to be routed to

the preamplifier’s recording outputs. One component (for example, the record player) can therefore be

listened to whilst the output from another (say, the tuner) can be recorded onto a tape recorder. It is

possible to lock the record controls and prevent accidental de-selection during recording. Record-lock

is switched on or off by depressing the source mono button four times within six seconds.

mute and mono facilities

To the left of each bank of buttons there are two further buttons labelled mute and mono. These work

independently: for example the mute button in the lower (recording) bank does not affect the signal

that is chosen via the upper (source) buttons, and vice versa. Operating the mono button on the source

bank will not affect the record circuits. To select either function press the relevant button once. To

cancel that function press the button again.

preamplifier inputs

Input 1 is a high level input, but can be converted into a phono input by fitting plug in boards. Please

see your dealer for further details.

Input 2 is a standard high level input. Before using, see the section “input socket 2” below.

Input 3 is a standard high level input.

Inputs 4, 5 and 6 are standard high level inputs and also have record output facilities, so these should

be assigned to your tape recorder, cassette deck or VCR.

input socket 2 to expand input capabilities

Please note that input 2 is provided with two sockets. Use socket 2a for connecting your usual

ancillary equipment. The extra socket (2b) is for the Prefix or Stageline phono stage. Only one of these

sockets may be used at a time, for safety as well as performance. Your preamplifier will have a

protective cover fitted over the extra socket. If you wish to use it, it is advisable to refit the protective

cover over the socket that will now be unused, to prevent mistakes.

remote control

For operation of the nac 52 using the NARCOM 2 remote handset please see pages 18 and 19

5

Naim Audio NAC-112 Owners manual

nac 52 front

inputs

1

2(a/b)

3

4

5

6

 

 

 

 

 

 

source

record

mute

volume

balance

mono

nac 52 rear

 

 

 

 

 

 

 

 

 

 

high level inputs

 

 

 

 

 

 

 

 

 

phono input

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

5

4

3

 

2a

 

2b

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

6

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

audio power supply

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

ch 1 left

 

 

 

ch 2 right

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

digital power supply

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

phono

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

ground

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

input 2b

 

 

 

 

 

 

 

 

 

 

 

inputs 6, 5 & 4

 

 

inputs 3 & 2a

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

ch1

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

nc

+ve

 

 

 

 

 

+ve

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

ch1

 

 

 

 

 

 

 

 

 

 

 

ch1

 

 

 

 

 

 

ch2

 

ch1

 

 

 

 

 

 

 

 

nc

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

-ve

 

 

 

 

 

 

 

 

 

 

 

 

 

ch 2

 

-ve

 

 

 

 

 

ch2

 

 

-ve

 

ch2

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Specifications

nac 52

High level input sensitivities

75mV, 100k

Phono input options

 

Moving Magnet N

2mV, 47k

Moving Coil S

100µV, 470

Moving Coil K

100µV, 560

Moving Coil E

400µV, 560

Overload margin (all inputs, all audio frequencies)

40dB

Main output level

0.775V, <50

Tape output level

75mV, 600

Case size (H x W x D)

76 x 430 x 300mm

6

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