Naim Audio Supercap Owners manual

W O R L D C L A S S H I - F I

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

Preamplifiers, Integrated Amplifier, Power Amplifiers, Power Supplies

Contents

Page

Section

Equipment Installation

Audio Connections

Mains Power Connection

General Installation

Preamplifiers

NAC 552

Installation and Operation

NAC 552 Connection Diagrams

NAC 552 Specification

NAC 252

Installation and Operation

NAC 252 Connection Diagrams

NAC 252 Specification

NAC 282

Installation and Operation

NAC 282 Connection Diagrams

NAC 282 Specification

NAC 202

Installation and Operation

NAC 202 Connection Diagrams

NAC 202 Specification

NAC 112x

Installation and Operation

NAC 112x Connection Diagrams

NAC 112x Specification

Integrated Amplifier

NAIT 5i

Installation and Operation

NAIT 5i Connection Diagrams

NAIT 5i Specification

Remote Handsets

Flash

Remote Handset

NARCOM 3

Remote Handset

2325iCom

Remote Handset

Power Amplifiers

NAP 500

Installation and Operation

NAP 500 Connection Diagram

NAP 500 Specification

NAP 300

Installation and Operation

NAP 300 Connection Diagram

NAP 300 Specification

NAP 250

Installation and Operation

NAP 250 Connection Diagram

NAP 250 Specification

NAPV 145

Installation and Operation

NAV 145 Connection Diagram

NAV 145 Specification

NAP 200

Installation and Operation

NAP 200 Connection Diagram

NAP 200 Specification

NAP 150x

Installation and Operation

NAP 150x Connection Diagram

NAP 150x Specification

NAPV 175

Installation and Operation

NAPV 175 Connection Diagram

NAPV 175 Specification

NAP 6-50

Installation and Operation

NAP 6-50 Connection Diagram

NAP 6-50 Specification

Power Supplies

Supercap, XPS, Hi-Cap

Installation and Connection

Flatcap 2, NAPSA, NAPSC

Installation and Connection

Power Supply Specifications

Declaration of Conformity

with amplifiers and loudspeakers are used.

Warning: an apparatus with CL ASS I construction shall be

Where the mains plug or an appliance coupler is used as the

The following label is attached to all mains powered

This equipment has been tested and found to comply with the

These limits are designed to provide reasonable protection

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

this equipment does cause harmful interference to radio or

television reception, which can be determined by turning

from that to which the receiver is connected.

technician for help.

W A R N I N G

THIS APPARATUS

MUST BE EARTHED

2 Audio Connections

It is important for both safety and performance that

the standard cables supplied are not modified.

2.1 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.

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 tend to deposit may degrade the

sound.

2.2 Loudspeaker Cables

Loudspeaker cables are vitally important and your dealer should

make them up to suit your installation. The cables 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. Contact your

dealer or Naim Audio for advice.

Many Naim amplifiers are designed only to work with Naim

loudspeaker cable and using alternatives may degrade the

performance or even damage the amplifier. Naim loudspeaker

cable is directional and should be oriented so that the printed

arrow points towards the speakers. The amplifier/loudspeaker

connectors supplied are designed to make a robust electro-

mechanical connection and to comply with European safety

regulations. They should be used in preference to alternatives.

3 Mains Power Connection

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.

Introduction

This manual covers all Preamplifiers, the Nait 5i Integrated Amplifier,

1 Equipment Installation

Normally your Naim Audio equipment will have been installed by the dealer who sold

it to you - even if you live outside their immediate vicinity. In any event however

your dealer is responsible for making sure that the system sounds as it should.

Information given here is not intended to reduce this responsibility in any way.

3.1 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 which is coloured

must be

connected to the terminal in the plug which is marked by the

letter

or by the safety earth symbol or coloured

YELLOW

The wire which is coloured

must be connected to the

terminal in the plug which is marked with the letter

coloured

The wire which is coloured

must be connected to the

terminal in the plug which is marked with the letter

or coloured

3.2 Non-rewirable Mains Plugs

If a non-rewirable plug is cut from a mains lead (for whatever

purpose) the plug

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.

3.3 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 lead to mechanical hum

from amplifier and power supply transformers. Naim transformers

are large in size with heavy gauge windings, making them

relatively sensitive to such distortion and it may be necessary to

take account of any 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 improve system performance.

Advice on the installation of a separate mains circuit should be

sought from a qualified electrician.

Do not substitute alternative mains leads and plugs to

those supplied. They are selected to offer the best possible

performance.

4 General Installation

Naim equipment is designed to offer the finest sound

quality possible avoiding compromise wherever

practical. This can lead to circumstances that may

be unfamiliar. The notes that follow contain advice

specifically related to Naim equipment as well as

more general warnings about the use of domestic

audio products. Please read them carefully.

4.1 Siting The Equipment

In order to reduce the risk of hum audible from the

loudspeakers, power supplies and power amplifiers 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. Ensure that your

equipment rack or table can support the weight and is stable.

4.2 Switching On

Source components and power supplies should be switched on

before the power amplifiers. Always switch amplifiers off 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

amplifiers 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 power amplifiers

are switched off.

4.3 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.

4.4 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.

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.

4.5 Non-standard Cables

Use of non-standard speaker cables or interconnects on some

products may invalidate your guarantee.

4.6 Lightning Precautions

Your Naim hi-fi system can be damaged by lightning. Power

amplifiers are particularly at risk and should be turned off 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.

4.7 Liquid Precautions

Equipment must not be exposed to dripping or splashing and no

objects filled with liquid, such as vases, should be placed on the

equipment.

4.8 Equipment Fuses

Mains powered Naim Audio equipment is fitted with a mains

input fuse on the rear panel adjacent to the mains input socket.

Replace it if necessary only with the spare fuse supplied or

with identical fuses. Repeated failure of this fuse points to an

equipment or system fault that should be investigated by your

dealer or at the factory by Naim itself.

4.9 Problems?

Consumer protection varies from country to country. In

most territories a dealer 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 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 local guarantee

arrangements with your dealer. Contact Naim Audio directly for

help and advice if necessary.

4.10 Repairs and Updates

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 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 the Service Department:

Tel:

Email:

service@naim-uk.com

Please quote the product serial number (found on its rear panel)

in all correspondence.

Introduction

NAC 552

5 Installation and Operation

The NAC 552 preamplifier does not incorporate an internal power supply and can be

used only in conjunction with the NAC 552PS power supply. Diagram 6.3 illustrates

connection of the NAC 552 to its power supply.

The four transit screws on the underside of the NAC 552 case should be removed before

use and must be replaced if the unit is to be re-packed and shipped. These transit

screws must not be used in any other Naim product. Do not invert the NAC 552 once the

transit screws are removed.

5.1 Source Inputs and Record Outputs

The input selector buttons arranged along the

bank

select the

source

signal to be routed to the power amplifier

and the loudspeakers. Below them, in the

bank, are a

corresponding array of buttons which select the signal to be

routed to the preamplifier’s

outputs.

These separate source and record sections enable one source (a

CD player, for example) to be listened to whilst the output from

another (say, the tuner) is simultaneously selected for recording.

It is possible to lock the record controls and prevent

accidental de-selection during recording. Record-lock is switched

on or off by pressing the

source mono

button four times within six

seconds.

Indicators are fitted to the NAC 552 rear panel above each input

socket. These indicators illuminate to provide information on

input selection and on input mapping setup and programming.

5.2 Input Socket Mapping (Program Mode)

Any NAC 552 source input socket can be selected by any

button. For example, while the NAC 552 default setup is for

the CD input button to select input socket No. 2, custom

programming of

could enable any input socket to

be selected by pressing the CD button. Mapping of each record

button follows the corresponding source button.

Input mapping setup is accessed through the NAC 552 program

mode. To switch into program mode press and hold the

key

on the remote handset (in preamplifier mode). Program mode is

indicated by a flashing indicator on the volume control and the

record select indicators extinguishing. If no function is operated

within five minutes of entering program mode the NAC 552 will

return to normal mode automatically.

Any of the six source buttons on the front panel can be mapped

to any of the nine stereo inputs (seven DIN sockets and two RCA

Phono socket pairs) on the rear panel. In program mode, as a

source input is selected, a rear panel indicator will illuminate to

designate the socket to which it is mapped.

To change the input socket mapped to a source button, select

the source button and use the front panel

and

buttons to scroll along the input sockets. If the input

socket selected is already mapped to a source button the

indicator above the socket will flash repeatedly. It is possible to

map one input socket to more than one source button but NOT

to map multiple input sockets to one source button. The remote

handset record

and

functions can also be used to

set up input mapping.

To exit from program mode press and hold the

key on the

handset until the record select indicators are restored and the

volume indicator stops flashing.

5.4 Automatic Input Switching

The NAC 552 incorporates an optional automatic input switching

feature which can select the appropriate input as soon as any

handset function for a particular Naim source component is

operated. For example, if the tuner input is selected on the NAC

552 and the CD play key is operated on the handset, the NAC

552 will automatically switch to the CD input. Automatic input

switching can be programmed to operate independently on any

combination of the CD, AV and Tuner input buttons (and sockets

to which they are mapped).

To enable automatic input switching, first switch the NAC 552

into program mode as described in Paragraph 5.2. The front

panel source mono button will illuminate if automatic switching

is already enabled. If it is not enabled it can be switched on by

pressing the

source mono

button twice.

With auto switching enabled,

pressing the

source mono

button

will reveal the inputs selected

for auto switching by their button

indicators illuminating for a short

time. Repeated operation of the

source mono

button will sequentially

select through each possible

combination of CD, Tuner, AV inputs,

and auto switching disabled (CD,

Tuner and AV button indicators off).

When the desired inputs selected for

auto switching are indicated, stop

pressing the

source mono

button.

Preamplifier

5.3 Socket Types and Mapping Defaults

Input Socket Socket Source Button

Number Features Mapping Default

1 DIN input Not Mapped

2 DIN input CD

3 DIN input TUNER

4 DIN input/output, unity gain capable TAPE

5 DIN input/output, unity gain capable AV

6 DIN input/output AUX 1

7 DIN input, power output for Stageline AUX 2

8 RCA Phono pair Not mapped

9 RCA Phono pair Not mapped

NAC 552

The remote handset

(Flash) or

(Narcom 3) key can

also be used to set up automatic source switching. Automatic

input switching only becomes operational on exiting from

program mode by pressing and holding the handset

key.

In a few cases some further equipment configuration may

be required for auto switching to operate correctly on the AV input.

Please contact your retailer or local distributor for advice.

5.5 AV Integration (Unity Gain)

The NAC 552 unity gain function enables an audio-visual

processor to be integrated such that its volume control takes

over command of signals connected to selected NAC 552

inputs. Unity gain can be selected on input sockets 4 and 5

only (the corresponding input buttons will depend on the input

mapping set up).

To select unity gain, first switch the NAC 552 into program mode

as described in Paragraph 5.2. The front panel source mute

button will illuminate if unity gain is selected on any input. If it is

not enabled it can be switched on by pressing the

source mute

button twice.

With unity gain enabled, pressing the

source mute

button

again will reveal the inputs selected by their button indicators

illuminating for a short time. Repeated operation of the

source

button will sequentially select each combination of Input

4, Input 5 and unity gain disabled. When the desired inputs are

indicated, stop pressing the source mute button. The selected

inputs will then be enabled for unity gain. The remote handset

key can also be used to set up unity gain.

Unity gain only becomes operational on exiting from program

mode by pressing and holding the handset

key.

The unity gain feature must be used with care. It effectively

by-passes the NAC 552 volume and balance controls leaving any

signal connected to a unity gain input to be passed to the power

amplifier and speakers at full volume. In order to reduce the

potential for inadvertent mishap, any subsequent modifications

to input mapping will automatically disable previously set up unity

gain inputs. Additionally, if an input is selected which has unity gain

enabled, the NAC 552 volume and balance handset functions will

be disabled and their indicators will turn off. This will be flagged by

the volume or balance indicators flashing if either handset function

is operated.

5.6 Handset Volume and Balance Control

The remote handset

volume

and

keys provide some

alternative control characteristics. A quick press and release of

a key will adjust by a preset “nudge”. A quick press and release

of a key followed by press and hold will cause continual slow

adjustment. Simple press and hold will cause continual fast

adjustment.

5.7 Mute and Mono

Mute and mono functions can be controlled independently for

source and record signals via the front panel buttons to the left

of the two banks of source and record selection buttons. Mute

silences the output signal, while mono sums the left and right

channels.

5.8 Display

The NAC 552 front panel button display can be switched off

by pressing the remote handset (in preamplifier mode)

function. Any subsequent handset or front panel operation will

temporarily restore the display. A second operation of the

function will permanently restore the display.

5.9 Switch-on

After switch-on, via the NAC 552PS front panel

button,

the NAC 552 will remain muted for 30 seconds while control

systems and circuits stabilise. The source side will then un-mute

automatically leaving the record side muted (and its circuits

unpowered).

5.10 Remote Control

The

remote handset supplied with the NAC 552 duplicates

all configuration and control functions. See Section 23 for more

information. The

and

handsets will also control

the NAC 552. See Sections 24 and 25 for more information.

5.11 Defaults

To restore all programmable settings to the factory defaults

press and hold the remote handset

key while the

preamplifier is in program mode. The preamplifier will exit from

program mode following this operation.

6.1 NAC 552 Front

volume

NAC 552

6.2 NAC 552 Rear

Preamplifier

6.3 NAC 552 Connected to NAC 552PS

Interconnect Cables

signal ground

Inputs 1, 2 & 3

Inputs 4, 5 & 6

Input 7

7. NAC 552/NAC 552PS Specification

75mV, 47kΩ

40dB

(all inputs all audio frequencies)

0.775V, <50Ω

Tape Output Level:

75mV, 600Ω

Auxiliary Power Outputs:

For Stageline/Prefix phono stage.

Both 87 x 432 x 314mm

100-120V or 220-240V, 50/60Hz

to stereo power

to mono or dual mono

NAC 252

8.1 Source Inputs and Record Outputs

The input selector buttons arranged along the

bank

select the source signal to be routed to the power amplifier

and the loudspeakers. Below them, in the

bank, are a

corresponding array of buttons which select the signal to be

routed to the preamplifier’s record outputs.

These separate source and record sections enable one source (a

CD player, for example) to be listened to whilst the output from

another (say, the tuner) is simultaneously selected for recording.

It is possible to lock the record controls and prevent

accidental de-selection during recording. Record-lock is switched

on or off by pressing the

source mono

button four times within six

seconds.

8.2 Input Socket Mapping (Program Mode)

The NAC 252 has six DIN input sockets and two alternative pairs

of RCA Phono sockets. The RCA Phono sockets can be mapped

individually to the CD and AUX 2 input buttons in place of the

DIN sockets.

Input mapping setup is accessed through the NAC 252 program

mode. To switch into program mode press and hold the

on the remote handset (in preamplifier mode). Program mode is

indicated by a flashing indicator on the volume control and the

record select indicators extinguishing. If no function is operated

within five minutes of entering program mode the NAC 252 will

return to normal mode automatically.

Once in program mode press and hold the remote handset

key to select or de-select the RCA Phono socket input for CD,

and the remote handset

key to select or de-select the RCA

Phono socket input for AUX 2. The corresponding front panel

input buttons can similarly be used to select or de-select the

RCA Phono socket inputs. The appropriate input button indicator

will flash three times on selection of the RCA Phono option and

once on selection of the DIN option.

To exit from program mode press and hold the

key on the

handset until the record select indicators are restored and the

volume indicator stops flashing.

8.3 Automatic Input Switching

The NAC 252 incorporates an optional automatic input switching

feature which can select the appropriate input as soon as any

handset function for a particular Naim source component is

operated. For example, if the tuner input is selected on the NAC

252 and the CD play key is operated on the handset, the NAC

252 will automatically switch to the CD input. Automatic input

switching can be programmed to operate independently on any

combination of the CD, AV and Tuner input buttons.

To enable automatic input switching, first switch the NAC 252

into program mode as described in Paragraph 8.2. The front

panel source mono button will illuminate if automatic switching

is already enabled. If it is not enabled it can be switched on by

pressing the

source mono

button twice.

With auto switching enabled, pressing the

source mono

button

will reveal the inputs selected for auto switching by their button

indicators illuminating for a short time. Repeated operation

of the

source mono

button will sequentially select each

combination of CD, Tuner, AV inputs, and auto switching disabled

(CD, Tuner and AV button indicators off). When the desired

inputs selected for auto switching are indicated, stop pressing

the source mono button.

The remote handset

(Flash) or

(Narcom) key can

also be used to set up automatic source switching. Automatic

input switching only becomes operational on exiting from

program mode by pressing and holding the handset

key.

In a few cases some further equipment configuration may

be required for auto switching to operate correctly on the AV input.

Please contact your retailer or local distributor for advice.

8.4 AV Integration (Unity Gain)

The NAC 252 unity gain function enables an audio-visual

processor to be integrated such that its volume control takes

over command of signals connected to selected NAC 252

inputs. Unity gain can be selected on the AV input only.

To select unity gain, first switch the NAC 252 into program mode

as described in Paragraph 8.2. The front panel

source mute

button will illuminate if unity gain is selected. If it is not enabled

it can be switched on by pressing the

source mute

button twice.

Deselect unity gain by again pressing the

source mute

button

twice. Unity gain only becomes operational on exiting from

program mode by pressing and holding the handset

key.

The unity gain feature must be used with care. It effectively

by-passes the NAC 252 volume and balance controls leaving any

signal connected to a unity gain input to be passed to the power

amplifier and speakers at full volume. Additionally, if the AV input

is selected while unity gain is enabled the volume and balance

handset functions will be disabled and their indicators will turn off.

This will be flagged by the volume or balance indicators flashing if

either handset function is operated.

8.5 Handset Volume and Balance Control

The remote handset

volume

and

keys provide some

alternative control characteristics. A quick press and release of

a key will adjust by a preset “nudge”. A quick press and release

of a key followed by press and hold will cause continual slow

adjustment. Simple press and hold will cause continual fast

adjustment.

8 Installation and Operation

The NAC 252 preamplifier does not incorporate an internal power supply and can

be used only in conjunction with the Supercap power supply. Diagram 9.3 illustrates

connection of the NAC 252 to the Supercap.

NAC 252

8.6 Mute and Mono

Mute and mono functions can be controlled independently for

source and record signals via the front panel buttons to the left

of the two banks of source and record selection buttons. Mute

silences the output signal, while mono sums the left and right

channels.

8.7 Display

The NAC 252 front panel button display can be switched off

by pressing the remote handset (in preamplifier mode)

function. Any subsequent handset or front panel operation will

temporarily restore the display. A second operation of the

function will permanently restore the display.

8.8 Switch-on

After switch-on, via the Supercap front panel

button,

the NAC 252 will remain muted for 30 seconds while control

systems and circuits stabilise. The source side will then un-mute

automatically leaving the record side muted.

A flashing mute indicator after switch-on indicates that the

preamplfier power supply or link plugs are incorrectly connected.

8.9 Remote Control

The

remote handset supplied with the NAC 252

duplicates all configuration and control functions. See Section

24 for more information. The

and

handset will

also control the NAC 252. See Sections 23 and 25 for more

information.

8.10 Defaults

To restore all programmable settings to the factory defaults

press and hold the remote handset

key while the

preamplifier is in program mode. The preamplifier will exit from

program mode following this operation.

Preamplifier

9.1 NAC 252 Front

volume

NAC 252

9.3 NAC 252 Connected to Supercap

Interconnect Cables

to stereo power

to mono or dual mono

10. NAC 252/Supercap Specification

75mV, 47kΩ

40dB

(all inputs all audio frequencies)

0.775V, <50Ω

Tape Output Level:

75mV, 600Ω

Auxiliary Power Outputs:

For Stageline/Prefix phono stage.

Both 87 x 432 x 314mm

100-120V or 220-240V, 50/60Hz

9.2 NAC 252 Rear

tuner

tape

Inputs 1, 2 & 6

Inputs 3, 4 & 5

Input 6

(alternative)

The NAC 252 AUX 2 input is provided with two sockets. The

lower socket, fitted on delivery with a blanking cover, is intended for

use with a Stageline or Prefix RCA Phono stage and incorporates

an appropriate DC power supply. The two sockets must not be used

simultaneously.

The RS232/comms interface is an optional upgrade. It can

be specified at time of order or fitted retrospectively. Contact your

local representative or Naim Audio directly for further information.

NAC 282

Preamplifier

11.1 Source Inputs and Record Outputs

The input selector buttons arranged along the

bank

select the source signal to be routed to the power amplifier

and the loudspeakers. Below them, in the

bank, are a

corresponding array of buttons which select the signal to be

routed to the preamplifier’s record outputs.

These separate source and record sections enable one source (a

CD player, for example) to be listened to whilst the output from

another (say, the tuner) is simultaneously selected for recording.

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

button four times within six

seconds.

11.2 Input Socket Mapping (Program Mode)

The NAC 282 has six DIN input sockets and two alternative pairs

of RCA Phono sockets. The RCA Phono sockets can be mapped

individually to the CD and AUX 2 input buttons in place of the

DIN sockets.

Input mapping setup is accessed through the NAC 282 program

mode. To switch into program mode press and hold the

key

on the remote handset (in preamplifier mode). Program mode is

indicated by a flashing indicator on the volume control and the

record select indicators extinguishing. If no function is operated

within five minutes of entering program mode the NAC 282 will

return to normal mode automatically.

Once in program mode press and hold the remote handset

key to select or de-select the RCA Phono socket input for CD,

and the remote handset

key to select or de-select the RCA

Phono socket input for AUX 2. The corresponding front panel

input buttons can similarly be used to select or de-select the

RCA Phono socket inputs.The appropriate input button indicator

will flash three times on selection of the RCA Phono option and

once on selection of the DIN option.

To exit from program mode press and hold the

key on the

handset until the record select indicators are restored and the

volume indicator stops flashing.

11.3 Automatic Input Switching

The NAC 282 incorporates an optional automatic input switching

feature which can select the appropriate input as soon as any

handset function for a particular Naim source component is

operated. For example, if the tuner input is selected on the NAC

282 and the CD play key is operated on the handset, the NAC

282 will automatically switch to the CD input. Automatic input

switching can be programmed to operate independently on any

combination of the CD, AV and Tuner input buttons.

To enable automatic input switching, first switch the NAC 282

into program mode as described in Paragraph 11.2. The front

panel source mono button will illuminate if automatic switching

is already enabled. If it is not enabled it can be switched on by

pressing the

source mono

button twice.

With auto switching enabled, pressing the

source mono

button

will reveal the inputs selected for auto switching by their button

indicators illuminating for a short time. Repeated operation

of the

source mono

button will sequentially select each

combination of CD, Tuner, AV inputs, and auto switching disabled

(CD, Tuner and AV button indicators off). When the desired

inputs selected for auto switching are indicated, stop pressing

the

source mono

button.

The remote handset

(Flash) or

(Narcom 3) key can

also be used to set up automatic source switching. Automatic

input switching only becomes operational on exiting from

program mode by pressing and holding the handset

key.

In a few cases some further equipment configuration may

be required for auto switching to operate correctly on the AV input.

Please contact your retailer or local distributor for advice.

11.4 AV Integration (Unity Gain)

The NAC 282 unity gain function enables an audio-visual

processor to be integrated such that its volume control takes

over command of signals connected to selected NAC 282

inputs. Unity gain can be selected on the AV input only.

To select unity gain, first switch the NAC 282 into program mode

as described in Paragraph 11.2. The front panel

source mute

button will illuminate if unity gain is selected. If it is not enabled

it can be switched on by pressing the

source mute

button twice.

Deselect unity gain by again pressing the source mute button.

Unity gain options only become operational on exiting from

program mode by pressing and holding the handset

key.

The unity gain feature must be used with care. It effectively

by-passes the NAC 282 volume and balance controls leaving any

signal connected to a unity gain input to be passed to the power

amplifier and speakers at full volume. Additionally, if the AV input

is selected while unity gain is enabled the volume and balance

handset functions will be disabled and their indicators will turn off.

This will be flagged by the volume or balance indicators flashing if

either handset function is operated.

11.5 Handset Volume and Balance Control

The remote handset

volume

and

keys provide some

alternative control characteristics. A quick press and release of

a key will adjust by a preset “nudge”. A quick press and release

of a key followed by press and hold will cause continual slow

adjustment. Simple press and hold will cause continual fast

adjustment.

11 Installation and Operation

The NAC 282 preamplifier does not incorporate an internal power supply but must be

used in conjunction with either a Naim power amplifier incorporating a preamplifier

power output, or with an appropriate Naim power supply. A separate NAPSC supply that

provides power to the display and control circuits is also supplied. Diagrams 12.3 and

12.4 illustrate two NAC 282 power supply options.

NAC 282

11.6 Mute and Mono

Mute and mono functions can be controlled independently for

source and record signals via the buttons to the left of the two

banks of source and record selection buttons. Mute silences the

output signal, while mono sums the left and right channels.

11.7 Display

The NAC 282 front panel button display can be switched off

by pressing the remote handset (in preamplifier mode)

function. Any subsequent handset or front panel operation will

temporarily restore the display. A second operation of the

function will permanently restore the display.

11.8 Switch-on

After switch-on, via the NAPSC and power supply, or power

amplifier,

button, the NAC 282 will remain muted for 30

seconds while control systems and circuits stabilise. The source

side will then un-mute automatically leaving the record side

muted (and its circuits unpowered).

A flashing mute indicator after switch-on indicates that the

preamplfier power supply or link plugs are incorrectly connected.

11.9 Remote Control

The

remote handset supplied with the NAC 282

duplicates all configuration and control functions. See Section

24 for more information. The

and

handset will

also control the NAC 252. See Sections 23 and 25 for more

information.

11.10 Defaults

To restore all programmable settings to the factory defaults press

and hold the remote handset

key while the preamplifier is

in program mode. The preamplifier will exit from program mode

following this operation.

12.1 NAC 282 Front

volume

to power

with internal

12.2 NAC 282 Rear

tuner

tape

Inputs 1, 2 & 6

Inputs 3, 4 & 5

Input 6

(alternative)

The NAC 282 AUX 2 input is provided with two sockets. The lower socket, fitted on delivery with a blanking cover, is intended for use with a Stageline or Prefix RCA Phono stage and incorporates an appropriate DC power supply. The two sockets must not be used simultaneously.

The RS232/comms interface is an optional upgrade. It can be specified at time of order or fitted retrospectively. Contact your local representative or Naim Audio directly for further information.

to NAPSC

with link and blanking plugs fitted

+ 28 hidden pages