O W N E R S M A N UA L
Preamplifiers, Integrated Amplifier, Power Amplifiers, Power Supplies
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:
WARNING
THIS APPARATUS
MUST BE EARTHED
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.
Contents
Page Section
11 Equipment Installation
2 Audio Connections
3Mains Power Connection
24 General Installation
3Preamplifiers
5NAC 552 Installation and Operation
46 NAC 552 Connection Diagrams
57 NAC 552 Specification
68 NAC 252 Installation and Operation
79 NAC 252 Connection Diagrams
810 NAC 252 Specification
911 NAC 282 Installation and Operation
1012 NAC 282 Connection Diagrams
1113 NAC 282 Specification
1214 NAC 202 Installation and Operation
1315 NAC 202 Connection Diagrams
1416 NAC 202 Specification
1517 NAC 112x
Installation and Operation
1618 NAC 112x Connection Diagrams
1719 NAC 112x Specification
18Integrated Amplifier
20 NAIT 5i Installation and Operation
1921 NAIT 5i Connection Diagrams
22 NAIT 5i Specification
20Remote Handsets
23 |
Flash Remote Handset |
21 24 |
NARCOM 3 Remote Handset |
2325 iCom Remote Handset
24Power Amplifiers
26 NAP 500 Installation and Operation
2527 NAP 500 Connection Diagram
28 NAP 500 Specification
2629 NAP 300 Installation and Operation
2730 NAP 300 Connection Diagram
31 NAP 300 Specification
2832 NAP 250 Installation and Operation
33 NAP 250 Connection Diagram
34 NAP 250 Specification
2935 NAPV 145 Installation and Operation
36 NAV 145 Connection Diagram
37 NAV 145 Specification
3038 NAP 200 Installation and Operation
39 NAP 200 Connection Diagram
40 NAP 200 Specification
3141 NAP 150x Installation and Operation
42 NAP 150x Connection Diagram
43 NAP 150x Specification
3244 NAPV 175 Installation and Operation
45 NAPV 175 Connection Diagram
46 NAPV 175 Specification
3347 NAP 6-50 Installation and Operation
48 NAP 6-50 Connection Diagram
49 NAP 6-50 Specification
34Power Supplies
50 Supercap, XPS, Hi-Cap Installation and Connection
3551 Flatcap 2, NAPSA, NAPSC Installation and Connection
3652 Power Supply Specifications
53 Declaration of Conformity
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.
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 electromechanical 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.
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.
1
Introduction
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: service@naim-uk.com
Please quote the product serial number (found on its rear panel) in all correspondence.
2
Preamplifier
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 pper 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.
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.
5.2 Input Socket Mapping (Program Mode) |
5.4 Automatic Input Switching |
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.
5.3 Socket Types and Mapping Defaults
Input Socket |
Socket |
Number |
Features |
1DIN input
2DIN input
3DIN input
4DIN input/output, unity gain capable
5DIN input/output, unity gain capable
6DIN input/output
7DIN input, power output for Stageline
8RCA Phono pair
9RCA Phono pair
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 
button twice.
Source Button
Mapping Default
Not Mapped
CD
TUNER
TAPE
AV
AUX 1
AUX 2
Not mapped
Not mapped
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.
3
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 ower 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
source bank
record bank
volume |
balance |
mono |
mute |
source and record |
|
|
|
|
selection |
4
NAC 552
6.2 NAC 552 Rear
n 1 |
n 2 |
n 3 |
n 4 |
n 5 |
n 6 |
|
Inputs 1, 2 & 3 |
Inputs 4, 5 & 6 |
|
Input 7 |
|||
|
c |
|
|
ch1 |
|
+ve |
|
|
|
(out) |
|
||
|
|
|
|
ch1 |
||
ch1 |
c |
ch1 |
|
ch2 |
+ve |
|
ch2 |
|
ch2 |
|
(out) |
ch2 |
|
ve |
|
|
|
ve |
|
ve |
6.3 NAC 552 Connected to NAC 552PS
mains input and fuse
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 |
Preamplifier
n 7 |
RC5 control in |
NAC 552PS |
signal ground |
n 8 |
n 9 |
NAC 552PS in |
|
ch 1 |
ch 1 |
|
|
ch 2 |
ch 2 |
|
additional signal output
to mono or dual mono power amplifiers
cable direction marker
to stereo power amplifiers
Interconnect Cables
NAC 552 Burndy 
240° 5 to 5 pin DIN 
5
NAC 252
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.
8.1 Source Inputs and Record Outputs
The input selector buttons arranged along the pper 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.
6
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 ower 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.
Preamplifier
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.
9.1 NAC 252 Front
source bank
record bank
volume |
balance |
mono |
mute |
source and record |
|
|
|
|
selection |
7
NAC 252
9.2 NAC 252 Rear |
n 5 |
n 6 |
|
aux 1 |
aux 2 |
n 1 |
n 2 |
n 3 |
n 4 |
signa |
n 6 (alternative) |
|
|
cd |
tuner |
tape |
av |
ground |
|
|
|
Inputs 1, 2 & 6 |
Inputs 3, 4 & 5 |
Input 6 |
|
||||
(alternative) |
|||||||
|
|
|
|
|
|||
|
c |
|
|
ch1 |
|
+ve |
|
|
|
|
(out) |
|
|||
|
|
|
|
ch1 |
|||
ch1 |
c |
ch1 |
|
ch2 |
+ve |
||
ch2 |
|
ch2 |
|
(out) |
ch2 |
|
|
|
ve |
|
ve |
|
ve |
|
|
9.3 NAC 252 Connected to Supercap
mains input and fuse
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 |
supercap supercap |
RC5 |
|
control in |
cd/RCA Phono |
aux 2/RCA Phono |
RS232 |
ch1 |
ch1 |
nterface |
ch2 |
ch2 |
|
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.
run as close together as possible
additional signal output |
|
|
|
to stereo power |
|
|
|
||
|
|
|
||
to mono or dual mono |
|
|
||
power amplifiers |
|
|
amplifiers |
|
cable |
|
Interconnect Cables |
||
|
|
|
|
|
direction |
|
NAC 252 Burndy |
||
marker |
240° 5 to 5 pin DIN |
|||
|
||||
8
Preamplifier
NAC 282
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.
11.1 Source Inputs and Record Outputs
The input selector buttons arranged along the pper 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.
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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, ower 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
source bank
record bank
volume |
balance |
mono |
mute |
source and record |
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selection |
12.2 NAC 282 Rear
n 5 |
n 6 |
power supply/output option sockets |
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to NAPSC |
RC5 in |
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aux 1 |
aux 2 |
with link and blanking plugs fitted |
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n 1 |
n 2 |
n 3 |
n 4 |
signa n 6 (alternative) |
cd |
tuner |
tape |
av |
ground |
Inputs 1, 2 & 6 |
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Inputs 3, 4 & 5 |
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Input 6 |
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(alternative) |
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c |
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ch1 |
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+ve |
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(out) |
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ch1 |
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ch1 |
c |
ch1 |
ch2 |
+ve |
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ch2 |
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ch2 |
(out) |
ch2 |
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ve |
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ve |
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ve |
cd/RCA Phono |
aux 2/RCA Phono |
to power |
RS232 |
ch1 |
ch1 |
amplifier |
nterface |
ch2 |
ch2 |
with internal |
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power supply |
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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.
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