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
1
1
Equipment Installation
2
Audio Connections
3
Mains Power Connection
2
4
General Installation
3
Preamplifiers
5
NAC 552
Installation and Operation
4
6
NAC 552 Connection Diagrams
5
7
NAC 552 Specification
6
8
NAC 252
Installation and Operation
7
9
NAC 252 Connection Diagrams
8
10
NAC 252 Specification
9
11
NAC 282
Installation and Operation
10
12
NAC 282 Connection Diagrams
11
13
NAC 282 Specification
12
14
NAC 202
Installation and Operation
13
15
NAC 202 Connection Diagrams
14
16
NAC 202 Specification
15
17
NAC 112x
Installation and Operation
NAC 112x Installation and OperationNAC 112x
16
18
NAC 112x Connection Diagrams
17
19
NAC 112x Specification
18
Integrated Amplifier
20
NAIT 5i
Installation and Operation
19
21
NAIT 5i Connection Diagrams
22
NAIT 5i Specification
20
Remote Handsets
23
Flash
Remote Handset
21
24
NARCOM 3
Remote Handset
23
25
iCom
Remote Handset
24
Power Amplifiers
26
NAP 500
Installation and Operation
25
27
NAP 500 Connection Diagram
28
NAP 500 Specification
26
29
NAP 300
Installation and Operation
27
30
NAP 300 Connection Diagram
31
NAP 300 Specification
28
32
NAP 250
Installation and Operation
33
NAP 250 Connection Diagram
34
NAP 250 Specification
29
35
NAPV 145
Installation and Operation
36
NAV 145 Connection Diagram
37
NAV 145 Specification
30
38
NAP 200
Installation and Operation
39
NAP 200 Connection Diagram
40
NAP 200 Specification
31
41
NAP 150x
Installation and Operation
42
NAP 150x Connection Diagram
43
NAP 150x Specification
32
44
NAPV 175
Installation and Operation
45
NAPV 175 Connection Diagram
46
NAPV 175 Specification
33
47
NAP 6-50
Installation and Operation
48
NAP 6-50 Connection Diagram
49
NAP 6-50 Specification
34
Power Supplies
50
Supercap, XPS, Hi-Cap
Installation and Connection
35
51
Flatcap 2, NAPSA, NAPSC
Installation and Connection
36
52
Power Supply Specifications
53
Declaration of Conformity
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 it from the
mains.
Warning: an apparatus with CLASS I construction shall be
connected to a mains socket outlet with a protective earthing
connection.
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 following label is attached to all mains powered
equipment:
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.
W A R N I N G
THIS APPARATUS
MUST BE EARTHED
1
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
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 Preamplifiers, the Nait 5i Integrated Amplifier,
all Power Amplifiers and all Power Supplies but begins with general
installation notes and statutory safety warnings for all Naim Audio
products. Product specific information begins in Section 5.
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
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
.
3.2 Non-rewirable Mains Plugs
If a non-rewirable plug is cut from a mains lead (for whatever
purpose) the plug
MUST
be disposed of in a way to render it
totally useless. Considerable shock hazard exists if the cut-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.
2
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:
+44 (0)1722 332266
Email:
Please quote the product serial number (found on its rear panel)
in all correspondence.
Introduction
3
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
upper
bank
select the
source
signal to be routed to the power amplifier
and the loudspeakers. Below them, in the
lower
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.
Note:
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
input mapping
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
prog
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
record mute
and
mono
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
mute
and
mono
functions can also be used to
set up input mapping.
To exit from program mode press and hold the
prog
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
4
NAC 552
The remote handset
mono
(Flash) or
mon
(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
prog
key.
Note:
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
mute
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
mute
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
prog
key.
Note:
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
balance
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)
disp
function. Any subsequent handset or front panel operation will
temporarily restore the display. A second operation of the
disp
function will permanently restore the display.
5.9 Switch-on
After switch-on, via the NAC 552PS front panel
power
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
Flash
remote handset supplied with the NAC 552 duplicates
all configuration and control functions. See Section 23 for more
information. The
NARCOM
and
iCom
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
disp
key while the
preamplifier is in program mode. The preamplifier will exit from
program mode following this operation.
6.1 NAC 552 Front
volume
balance
mute
mono
source
bank
record
bank
source and record
selection
5
NAC 552
6.2 NAC 552 Rear
Preamplifier
6.3 NAC 552 Connected to NAC 552PS
cable
direction
marker
NAC 552 Burndy
240° 5 to 5 pin DIN
Interconnect Cables
in 1
in 2
in 3
in 4
in 5
in 6
in 8
ch 1
ch 2
signal ground
in 9
ch 1
ch 2
NAC 552PS in
in 7
RC5 control in
NAC 552PS
mains input
and fuse
ch1
-ve
nc
nc
ch2
Inputs 1, 2 & 3
ch1
-ve
ch1
(out)
ch2
(out)
ch2
Inputs 4, 5 & 6
+ve
-ve
+ve
ch1
+ve
ch2
Input 7
7. NAC 552/NAC 552PS Specification
Input Sensitivities:
75mV, 47kΩ
Overload Margins:
40dB
(all inputs all audio frequencies)
Main Output Level:
0.775V, <50Ω
Tape Output Level:
75mV, 600Ω
Auxiliary Power Outputs:
For Stageline/Prefix phono stage.
Dimensions (H x W x D):
Both 87 x 432 x 314mm
Mains Supply (NAC 552PS):
100-120V or 220-240V, 50/60Hz
Note: For best performance the Burndy and 5 pin DIN cables should
be run as close together as possible.
to stereo power
amplifiers
to mono or dual mono
power amplifiers
additional signal output
6
NAC 252
8.1 Source Inputs and Record Outputs
The input selector buttons arranged along the
upper
bank
select the source signal to be routed to the power amplifier
and the loudspeakers. Below them, in the
lower
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.
Note:
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
prog 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 252 will
return to normal mode automatically.
Once in program mode press and hold the remote handset
1
key to select or de-select the RCA Phono socket input for CD,
and the remote handset
6
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
prog
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
mono
(Flash) or
mon
(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
prog
key.
Note:
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
prog
key.
Note:
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
balance
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.
7
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)
disp
function. Any subsequent handset or front panel operation will
temporarily restore the display. A second operation of the
disp
function will permanently restore the display.
8.8 Switch-on
After switch-on, via the Supercap front panel
power
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.
Note:
A flashing mute indicator after switch-on indicates that the
preamplfier power supply or link plugs are incorrectly connected.
8.9 Remote Control
The
NARCOM
remote handset supplied with the NAC 252
duplicates all configuration and control functions. See Section
24 for more information. The
Flash
and
iCom
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
disp
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
balance
mute
mono
source
bank
record
bank
source and record
selection
8
NAC 252
9.3 NAC 252 Connected to Supercap
cable
direction
marker
NAC 252 Burndy
240° 5 to 5 pin DIN
Interconnect Cables
mains input
and fuse
Note: For best performance the Burndy and 5 pin DIN cables should be
run as close together as possible.
to stereo power
amplifiers
to mono or dual mono
power amplifiers
additional signal output
10. NAC 252/Supercap Specification
Input Sensitivities:
75mV, 47kΩ
Overload Margins:
40dB
(all inputs all audio frequencies)
Main Output Level:
0.775V, <50Ω
Tape Output Level:
75mV, 600Ω
Auxiliary Power Outputs:
For Stageline/Prefix phono stage.
Dimensions (H x W x D):
Both 87 x 432 x 314mm
Mains Supply (Supercap):
100-120V or 220-240V, 50/60Hz
9.2 NAC 252 Rear
in 1
cd
in 2
tuner
in 3
tape
in 4
av
signal
ground
in 6 (alternative)
cd/RCA Phono
ch1
ch2
aux 2/RCA Phono
ch1
ch2
RS232
interface
supercap
RC5
control in
ch1
-ve
nc
nc
ch2
Inputs 1, 2 & 6
ch1
-ve
ch1
(out)
ch2
(out)
ch2
Inputs 3, 4 & 5
+ve
-ve
+ve
ch1
+ve
ch2
Input 6
(alternative)
in 5
aux 1
in 6
aux 2
supercap
Note:
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.
Note:
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.
9
NAC 282
Preamplifier
11.1 Source Inputs and Record Outputs
The input selector buttons arranged along the
upper
bank
select the source signal to be routed to the power amplifier
and the loudspeakers. Below them, in the
lower
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.
Note:
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.
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
prog
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
1
key to select or de-select the RCA Phono socket input for CD,
and the remote handset
6
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
prog
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
mono
(Flash) or
mon
(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
prog
key.
Note:
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
prog
key.
Note:
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
balance
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.
10
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)
disp
function. Any subsequent handset or front panel operation will
temporarily restore the display. A second operation of the
disp
function will permanently restore the display.
11.8 Switch-on
After switch-on, via the NAPSC and power supply, or power
amplifier,
power
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).
Note:
A flashing mute indicator after switch-on indicates that the
preamplfier power supply or link plugs are incorrectly connected.
11.9 Remote Control
The
NARCOM
remote handset supplied with the NAC 282
duplicates all configuration and control functions. See Section
24 for more information. The
Flash
and
iCom
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
disp
key while the preamplifier is
in program mode. The preamplifier will exit from program mode
following this operation.
12.1 NAC 282 Front
volume
balance
mute
mono
source
bank
record
bank
to power
amplifier
with internal
power supply
12.2 NAC 282 Rear
in 1
cd
in 2
tuner
in 3
tape
in 4
av
signal
ground
in 6 (alternative)
cd/RCA Phono
ch1
ch2
aux 2/RCA Phono
ch1
ch2
RS232
interface
RC5 in
ch1
-ve
nc
nc
ch2
Inputs 1, 2 & 6
ch1
-ve
ch1
(out)
ch2
(out)
ch2
Inputs 3, 4 & 5
+ve
-ve
+ve
ch1
+ve
ch2
Input 6
(alternative)
in 5
aux 1
in 6
aux 2
Note:
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.
Note:
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
power supply/output option sockets
with link and blanking plugs fitted
source and record
selection
11
Preamplifier
13. NAC 282 Specification
Input Sensitivities:
75mV, 47kΩ
Overload Margins:
40dB
(all inputs all audio frequencies)
Main Output Level:
0.775V, <50Ω
Tape Output Level:
75mV, 600Ω
Auxiliary Power Outputs:
For Stageline/Prefix phono stage.
Dimensions (H x W x D):
NAC 282 - 87 x 432 x 314mm
12.3 NAC 282 Connected to Supercap and NAPSC
NAC 282
mains input
and fuse
to stereo power
amplifiers
to mono or dual mono
power amplifiers
additional signal output
12.4 NAC 282 Connected to Hi-Cap and NAPSC
mains input
and fuse
to stereo power amplifiers
to mono or dual
mono power
amplifiers
additional
signal
output
cable
direction
marker
240° 5 to 5 pin DIN
Interconnect Cables
12
NAC 202
14.1 Input Socket Mapping (Program Mode)
The input selector buttons select the source input signal to be
routed to the power amplifier and the loudspeakers.
The NAC 202 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 202 program
mode. To switch into program mode press and hold the
prog
key
on the remote handset (in preamplifier mode). Program mode
is indicated by a flashing indicator on the volume control. If no
function is operated within five minutes of entering program
mode the NAC 202 will return to normal mode automatically.
Once in program mode press and hold the remote handset
1
button to select or de-select the RCA Phono socket input for CD,
and the remote handset
6
button 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
prog
key on the
remote until the volume indicator stops flashing.
14.2 Automatic Input Switching
The NAC 202 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
202 and the CD play key is operated on the handset, the NAC
202 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 202
into program mode as described in Paragraph 14.1. The front
panel
mon
button will illuminate if automatic switching is already
enabled. If it is not enabled it can be switched on by pressing
the front panel
mon
button twice.
With auto switching enabled, pressing the front panel
mon
button will reveal the inputs selected for auto switching by
their button indicators illuminating for a short time. Repeated
operation of the
mon
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
mon
button.
The remote handset
mon
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 prog key.
Note:
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.
14.3 AV Integration (Unity Gain)
The NAC 202 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 202
inputs. Unity gain can be selected on the AV input only.
To select unity gain, first switch the NAC 202 into program mode
as described in Paragraph 14.1. The front panel
mute
button will
illuminate if unity gain is selected. If it is not enabled it can be
switched on by pressing the
mute
button twice. Deselect unity
gain by again pressing the
mute
button.
Unity gain only become operational on exiting from program
mode by pressing and holding the handset
prog
key.
Note:
The unity gain feature must be used with care. It effectively
by-passes the NAC 202 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.
14.4 Handset Volume Control
The remote handset
volume
key provides 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.
14.5 Channel Balance
Channel balance adjustment is operated electronically within
the preamplifier and is controlled by the remote handset
bal
keys only. Balance will automatically centre as it reaches the
mid point. Centring is indicated by a flashing volume control
indicator. To resume adjustment once the balance has centred,
a handset
bal
key must be released and re-pressed.
The handset
bal
keys provides 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.
14 Installation and Operation
The NAC 202 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. An optional separate NAPSC
supply to provide power to the display and control circuits is also available. Diagram
15.3 illustrates the NAC 202 connected to a Hi-Cap power supply.
13
NAC 202
Preamplifier
14.6 Mute
The
mute
button silences and restores the output signal.
14.7 Record Monitor
The
mon
button operates the record monitor circuit enabling the
recorded output of a suitably equipped recording device to be
heard.
14.8 Record Mute
In order to minimise power consumption and improve sound
quality the NAC 202 record output circuits may be switched off.
To engage or disengage the record mute first operate the
record monitor function (mon) as described in Paragraph 14.7
above then press the front panel
mute
button. The mute button
indicator will be illuminated when record mute is engaged and
extinguished when record mute is disengaged.
Record mute can be engaged and disengaged from the remote
handset by operating the record monitor function followed by the
mute function.
14.9 Display
The NAC 202 front panel button display can be switched off
by pressing the remote handset (in preamplifier mode)
disp
function. Any subsequent handset or front panel operation will
temporarily restore the display. A second operation of the
disp
function will permanently restore the display.
14.10 Switch-on
After switch-on, via the power supply or power amplifier power
button, the NAC 202 will remain muted for 30 seconds while
control systems and circuits stabilise.
Note:
A flashing mute indicator after switch-on indicates that the
preamplfier power supply or link plugs are incorrectly connected.
14.11 Remote control
The NARCOM 3 remote handset supplied with the NAC 202
duplicates all configuration options. See Section 24 for more
information. The
Flash
and
iCom
handsets will also control the
NAC 202. See Sections 23 and 25 for more information.
14.12 Defaults
To restore all programmable settings to the factory defaults
press and hold the remote handset
disp
key while the
preamplifier is in program mode. The preamplifier will exit from
program mode following this operation.
15.1 NAC 202 Front
volume
mute
mon
source selection
14
NAC 202
to power
amplifier
with internal
power supply
15.2 NAC 202 Rear
in 1
cd
in 2
tuner
in 3
tape
in 4
av
in 5
aux 1
in 6
aux 2
cd/RCA Phono
ch1
ch2
aux 2/RCA Phono
ch1
ch2
RS232
interface
RC5 in
ch1
-ve
nc
nc
ch2
Inputs 1, 2 & 6
ch1
-ve
ch1
(out)
ch2
(out)
ch2
Inputs 3, 4 & 5
+ve
-ve
+ve
ch1
+ve
ch2
Input 6
(alternative)
signal
ground
in 6
(alternative)
Note:
The NAC 202 AUX 2 input is provided with two sockets. The
upper 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.
Note:
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
power supply/output option sockets
with link and blanking plugs fitted
16. NAC 202 Specification
Input Sensitivities:
75mV, 47kΩ
Overload Margins:
40dB
(all inputs all audio frequencies)
Main Output Level:
0.775V, <50Ω
Tape Output Level:
75mV, 600Ω
Auxiliary Power Outputs:
For Stageline/Prefix phono stage.
Dimensions (H x W x D):
NAC 282 - 87 x 432 x 314mm
15.3 NAC 202 Connected to Hi-Cap and NAPSC
mains input
and fuse
to stereo power amplifiers
to mono or dual
mono power
amplifiers
additional
signal
output
cable
direction
marker
240° 5 to 5 pin DIN
Interconnect Cables
15
NAC 112x
17.1 Input Socket Mapping (Program Mode)
The input selector buttons select the source input signal to be
routed to the power amplifier and the loudspeakers.
The NAC 112x 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 112x program
mode. To switch into program mode press and hold the
prog
key
on the remote handset (in preamplifier mode). Program mode
is indicated by a flashing indicator on the volume control. If no
function is operated within five minutes of entering program
mode the NAC 112x will return to normal mode automatically.
Once in program mode press and hold the remote handset
1
button to select or de-select the RCA Phono socket input for CD,
and the remote handset
6
button 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
prog
key on the
remote until the volume indicator stops flashing.
17.2 Automatic Input Switching
The NAC 112x incorporates an optional automatic input
switching feature which can select the appropriate input when
any handset function for a particular Naim source component is
operated. For example, if the tuner input is selected on the NAC
112x and the cd play key is operated on the handset, the NAC
112x will automatically switch to the cd input. Automatic input
switching can operate on any combination of the cd, tuner and
av inputs.
To enable automatic input switching, first switch the NAC 112x
into program mode as described in Paragraph 17.1. Program
mode is indicated by a flashing indicator on the volume control.
The front panel mon button will illuminate if automatic input
switching is already enabled. If it is not enabled it can be
activated by pressing the handset
mon
key or front panel
mon
button twice.
With automatic input switching enabled, pressing the
mon
key
or the
mon
button will reveal the inputs selected for automatic
input switching by their button indicators illuminating for a short
time. Repeated operation of the
mon
key or
mon
button will
sequentially select through each possible combination of cd,
tuner, and av inputs, and automatic input switching disabled (cd,
tuner and av indicators off). When the desired inputs selected
for automatic input switching are indicated, stop pressing the
key or button.
To disable automatic input switching, press the
mon
key or
mon
button repeatedly until no input buttons are illuminated.
Automatic input switching only becomes operational or is
cancelled on exiting from program mode by pressing and holding
the handset
prog
key.
17.3 Input Volume Compensation
The NAC 112x incorporates an input volume compensation
system that enables different source component output levels to
be matched.
To program the volume compensation for each input first set the
volume control to a comfortable listening level with the loudest
source (probably CD). Switch the NAC 112x into program mode
as described in Paragraph 17.1. Now select an input to be
adjusted in comparison to the previously selected source and
use the handset
vol up
and
vol down
keys to set an appropriate
volume level. The preamplifier volume control will not rotate
during this operation. Select a further input to adjust if required.
Note:
The front panel volume control cannot be used to adjust
input volume compensation. The handset volume keys only must
be used.
To exit program mode press and hold the handset
prog
key until
the volume control indicator stops flashing.
Note:
Input Volume Compensation can be reset by restoring the
factory defaults. See Section 17.11
17.4 AV Integration (Unity Gain)
The 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 112x inputs. Unity gain can
be selected on the AV input only.
To select unity gain, first switch the NAC 112x into program
mode as described in Paragraph 17.1. The front panel
mute
button will illuminate if unity gain is selected. If it is not enabled
it can be switched on by pressing the remote handset
mute
button. Deselect unity gain by again pressing the handset
mute
button.
Note:
The unity gain feature must be used with care. It effectively
by-passes the NAC 112x 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 handset
preamplifier volume or balance functions are operated while the
unity gain AV input is selected, subsequently selected inputs will be
modified by the new volume or balance settings.
17.5 Handset Volume
The remote handset
vol
keys provides some alternative control
characteristics. A quick press and release of a key will adjust
the volume by a small amount while a press and hold will cause
first slow and then faster adjustment.
17 Installation and Operation
The NAC 112x 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. Diagram 18.3 illustrates the
NAC 112x connected to a Flatcap 2 power supply.
Preamplifier
16
NAC 112x
17.6 Channel Balance
Channel balance adjustment is operated electronically within the
preamplifier and is controlled by the remote handset
bal
keys
only. Balance will automatically centre as it reaches the mid
point. Centring is indicated by a flashing volume control indicator.
To resume adjustment once the balance has centred, a handset
bal
key must be released and re-pressed.
17.7 Mute
The
mute
button silences and restores the output signal.
17.8 Record Monitor
The
mon
button operates the record monitor circuit enabling the
recorded output of a suitably equipped recording device to be
heard.
17.9 Record Mute
In order to minimise power consumption and improve sound
quality the NAC 112x record output circuits may be switched off.
To engage or disengage the record mute first operate the
record monitor function (mon) as described in Paragraph 17.8
above then press the front panel
mute
button. The mute button
indicator will be illuminated when record mute is engaged and
extinguished when record mute is disengaged.
Record mute can be engaged and disengaged from the remote
handset by operating the record monitor function followed by the
mute function.
17.10 Display
The NAC 112x front panel button display can be switched off
by pressing the remote handset (in preamplifier mode)
disp
function. Any subsequent handset or front panel operation will
temporarily restore the display. A second operation of the
disp
function will permanently restore the display.
17.11 Switch-on
After switch-on, via the power supply or power amplifier power
button, the NAC 112x will remain muted for 15 seconds while
control systems and circuits stabilise.
17.12 Remote control
The
NARCOM 3
remote handset supplied with the NAC 112x
duplicates all configuration options. See Section 24 for more
information. The
Flash
and
iCom
handsets will also control the
NAC 112x. See Sections 23 and 25 for more information.
17.13 Defaults
To restore all programmable settings to the factory defaults press
and hold the remote handset
disp
key while the preamplifier is
in program mode. The preamplifier will exit from program mode
following this operation.
18.1 NAC 112x Front
volume
mute
mon
source selection
17
Preamplifier
NAC 112x
19. NAC 112x Specification
Input Sensitivities:
75mV, 47kΩ
Overload Margins:
35dB
(all inputs all audio frequencies)
Main Output Level:
0.775V, <50Ω
Tape Output Level:
75mV, 600Ω
Auxiliary Power Outputs:
For Stageline/Prefix phono stage.
Dimensions (H x W x D):
70 x 432 x 301mm
cable
direction
marker
240° 5 to 5 pin DIN
Interconnect Cables
mains input
and fuse
power
to stereo power
amplifiers
to mono
or dual
mono power
amplifiers
for CD5x , Headline or
Stageline. Additional
interconnects required
in 6
(alternative)
to power amplifier with internal power supply
18.2 NAC 112x Rear
in 1
cd
in 2
tuner
in 3
tape
in 4
av
in 5
aux 1
in 6
aux 2
RS232
interface
RC5 in
ch1
-ve
nc
nc
ch2
Inputs 1, 2 & 6
ch1
-ve
ch1
(out)
ch2
(out)
ch2
Inputs 3, 4 & 5
+ve
-ve
+ve
ch1
+ve
ch2
Input 6
(alternative)
signal ground
Note:
The NAC 112x AUX 2 input is provided with two sockets. The
left hand 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.
power supply
upgrade.
link plug fitted
Note:
The NAC 112x features various technologies to reduce
microphonic effects. Some movement of the board and sockets
when connecting and disconnecting cables is normal.
aux 2/RCA Phono
ch1
ch2
cd/RCA Phono
ch1
ch2
Note:
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.
18
NAIT 5i
20 Installation and Operation
The NAIT 5i Integrated Amplifier should be installed on a dedicated equipment stand
intended for the purpose. Care should be taken to ensure that it is level. The NAIT
5i can be operated from its internal power supply only. No power supply upgrade is
possible.
20.1 Inputs
The front panel input selector buttons select the source input
signal to be routed to the power amplifier and the loudspeakers.
The four buttons are labelled cd, tuner, tape and av. Each input
button corresponds to a pair of rear panel RCA Phono input
sockets. The cd and tuner inputs are additionally provided with
alternative DIN sockets. 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.
20.2 Automatic Input Switching (Program Mode)
The NAIT 5i 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
NAIT 5i and the cdplay key is operated on the handset, the NAIT
5i will automatically switch to the cd input. Automatic input
switching can be set up to operate on any combination of the
cd, tuner and av inputs.
To enable automatic input switching, first switch the NAIT 5i into
program mode by pressing and holding either the
prog
key on
the remote handset (handset in preamplifier mode) or the
cd
button on the amplifier front panel. Program Mode is indicated
by a flashing indicator on the front panel volume control. If no
function is operated within five minutes of entering program
mode the NAIT 5i will return to normal mode automatically.
The front panel tape button will illuminate if automatic input
switching is already enabled. If it is not enabled it can be
activated by pressing the handset
3
key or front panel
tape
button twice.
With automatic input switching enabled, pressing the
3
key or
the
tape
button will reveal the inputs selected for automatic
input switching by their button indicators illuminating for a
short time. Repeated operation of the
3
key or
tape
button will
sequentially select through each possible combination of cd,
tuner, and av inputs, and automatic input switching disabled (cd,
tuner and av indicators off). When the desired inputs selected
for automatic input switching are indicated, stop pressing the
key or button.
To disable automatic input switching, press the
3
key or
tape
button repeatedly until no other buttons are illuminated.
Automatic input switching only becomes operational or is
cancelled on exiting from program mode by pressing and holding
the handset
prog
key or front panel
cd
button.
20.3 AV Integration (Unity Gain)
The Unity Gain function enables an audio-visual processor to be
integrated with the NAIT 5i such that its volume control takes
over command of signals connected the amplifier’s AV input.
To select unity gain, first switch the NAIT 5i into program
mode as described in Paragraph 20.2. The AV input button will
illuminate if unity gain is already enabled. If it is not enabled
it can be activated by pressing the handset
4
key or the front
panel
AV
button. Deselect unity gain by again pressing the
4
key or the
AV
button. Unity gain only becomes operational or is
cancelled on exiting from program mode by pressing and holding
the handset
prog
key or front panel
cd
button.
Note:
The unity gain feature must be used with care. It effectively
by-passes the NAIT 5i volume control leaving any signal connected
to the unity gain input to be passed to the power amplifier and
speakers at full volume. Additionally, if an input is selected which
has unity gain enabled, the volume handset functions will be
disabled and their indicators will turn off. This will be flagged by the
volume indicator flashing if its handset keys are used.
20.4 Restoring Defaults
The programmable functions can be restored to their default,
(inactive) states by pressing and holding the front panel
tuner
button or the handset
disp
key (handset in preamplifier
mode) while the NAIT 5i is in program mode.
20.5 Outputs
A stereo set of speaker connection sockets are 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 will provide the best
results, however, a wide range of speaker cable types can be
used without risk of damage to the amplifier.
Ensure when connecting speakers that they are “in-phase”. That
is, the positive and negative connection orientation at both the
speaker and amplifier ends of the cable is the same for both
speakers.
The tape output always carries the selected input signal. No
“record monitor” function is available.
20.6 Volume and Mute Control
The remote handset
vol
keys provides some alternative control
characteristics. A quick key press and release will adjust the
volume incrementally. A quick key press and release followed by
press and hold will provide continual slow adjustment. Simple
press and hold will provide continual fast adjustment.
Mute control is available from the remote handset only. Mute is
indicated by the amplifier volume control indicator flashing.
Note:
The NAIT 5i does not incorporate any facility for channel
balance adjustment.
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