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 I S S U E 2
Preamplifiers: NAC 552, NAC 252, NAC 282, NAC 202, NAC 112
Introduction |
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Naim Audio products are always conceived with performance as the |
CONTENTS |
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top priority and careful installation will help ensure that their full |
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potential is achieved. This manual begins with statutory safety |
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1 Equipment Installation |
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2 Cables and |
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warnings and general installation tips for all Naim Audio products. |
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connections |
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Product specific information begins in Section 6. |
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3 Getting Started |
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3.1 switching on and off |
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3.2 running in |
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3.3 mains supply |
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1 Equipment Installation |
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3.4 siting the equipment |
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3.5 if you have a problem |
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Normally your Naim equipment will have been installed by the dealer who sold it to you |
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4 Warnings |
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even if you live outside their immediate vicinity. Your dealer is responsible for making |
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3 |
5 Connection |
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sure that the system sounds exactly as it should and information given here is not |
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5.1 mains lead |
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intended to reduce this responsibility in any way. |
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5.2 non-rewireable mains |
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plugs |
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2 Cables and Connections |
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5.3 fuse carrier |
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5.4 plug fuses |
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Please do not modify the standard interconnect cables |
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6 NAC 552 |
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supplied with your Naim equipment. This is important for |
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7 NAC 552 |
Connections |
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safety as well as performance. One end of each cable is |
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8 NAC 252 |
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marked with a band to establish its correct orientation. |
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9 NAC 252 |
Connections |
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The band always marks the end that connects to the |
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10 NAC 282 |
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signal source. |
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11 NAC 282 |
Connections |
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Loudspeaker leads are also very important. Naim |
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12 NAC 202 |
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loudspeaker cable is correct for your system and your |
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13 NAC 202 |
Connections |
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dealer will make up leads to suit your equipment |
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14 NAC 112 |
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installation. The leads should each be at least 3.5 metres |
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15 NAC 112 Connections |
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long and of equal length. The recommended maximum is |
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16 Flash Handset |
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20 metres. Loudspeaker leads are, like interconnect leads, |
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17 Narcom 3 Handset |
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directional, and should be connected so that the printed |
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28 |
Standards Declaration |
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arrow points towards the speakers. Using alternative |
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loudspeaker cable will degrade performance, and may even |
3 Getting Started |
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damage your amplifier. An exception to these loudspeaker |
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cable constraints is the NAP 6-50 multi-room power |
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amplifier. The NAP 6-50 is designed to be tolerant of both |
3.1 switching on and off |
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a wide variety of cable types, and cable runs well in excess |
Source components and power supplies for cd players, |
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of 20m. The loudspeaker connectors supplied with all Naim |
tuners, preamplifiers and crossovers should be switched |
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amplifiers and loudspeakers have been specifically |
on before switching on the power amplifier(s). Always |
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designed to make a robust mechanical connection. It is |
switch the amplifier(s) off and wait about a minute for |
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essential that these are used in order to comply with |
the power supply capacitors to discharge before |
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current European safety regulations. |
connecting or disconnecting any leads. Always use the |
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power switch on the product rather than a mains outlet |
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All the plugs and sockets supplied with your Naim |
switch. |
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equipment have been chosen because they make the best |
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possible connection for their purpose. A poor contact will |
3.2 running in |
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degrade the signal substantially and plugs and sockets |
Your Naim equipment will take a considerable time to run |
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should look clean and free from corrosion. The easiest way |
in before it performs at its best. The duration varies, but |
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to clean them is to switch off the equipment, pull the plugs |
under some conditions you will find that the sound |
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out of their sockets, and push them back in again. Special |
continues to improve for as much as five weeks. Better and |
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contact cleaners and contact enhancers should not be |
more consistent performance will be achieved if the system |
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used as they tend to deposit a film which is very difficult to |
is left switched on for long periods. It is worth |
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remove and may degrade the sound. |
remembering however that all electronic equipment can be |
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damaged by lightning. Please read the warnings section. |
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1
Introduction
3.3 mains supply
Where fused plugs are used 13 amp fuses should be fitted. Fuses of a lower rating will fail after a period of use.
A hi-fi system usually shares a mains circuit with other household equipment some of which can cause distortion of the mains waveform. In some Naim equipment such distortion can lead to a mechanical hum from the transformers. The hum is not transmitted through the speakers and has no effect on the performance of the system but is purely local to the transformer itself. A separate fused mains circuit (like that reserved for electric cookers) may reduce transformer hum. Such a circuit (ideally with a 30 or 45 Amp rating) will also have a lower impedance, supply cleaner power, and consequently improve system performance.
Do not wire voltage dependent resistors or noise suppressors into mains plugs. They degrade the mains supply and the sound.
IMPORTANT
In order to comply with current European safety regulations it is essential that the Naim loudspeaker connectors supplied with amplifiers and loudspeakers are used.
Do not under any circumstances allow anyone to modify your Naim equipment without first checking with the factory, your dealer, or your distributor. Unauthorised modifications will invalidate your guarantee.
For your own safety do not under any circumstances open Naim equipment without first disconnecting the mains.
The following label is attached to all mains powered equipment:
W A R N I N G
THIS APPARATUS
MUST BE EARTHED
2
3.4 siting the equipment
Power supplies and amplifiers should be located a reasonable distance away from other equipment. This separation will stop transformer radiation causing hum audible from the loudspeakers. The 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 easily support the weight and is stable.
3.5 if you have a problem
Legal consumer protection varies from country to country. In most territories a dealer must be prepared to take back any Naim equipment he has sold you if he cannot make it work to your satisfaction in your own home. A problem may be due to a fault in any part of the system or its installation so it is essential to make full use of your local dealer’s diagnostic skills on site. Please contact your local distributor, or Naim at the address in the back of this manual, if any difficulties cannot be resolved. Some Naim equipment is made in special versions for different territories and this makes it impracticable to arrange international guarantees. Please establish the guarantee arrangements with your own dealer at the time of sale. We are always available to offer help and advice.
It is essential that repairs and updates are only carried out by an authorised Naim dealer, or at the factory by Naim itself. Many components are made, tested or matched specially for Naim and appropriate replacements are often unobtainable from non-specialist sources.
4 Warnings
Naim equipment is designed to offer the finest sound quality that can be achieved avoiding compromise wherever possible. This can lead to circumstances that may be unfamiliar. The material that follows contains advice specifically related to Naim equipment as well as more general warnings about the use of domestic audio products. Please read it carefully.
The transformers in Naim power amplifiers and power supplies may sometimes make a mechanical noise caused by distortion of the mains waveform. Naim transformers are large in size and have heavy gauge secondary windings making them relatively sensitive to such distortion. A separate mains circuit for your hi-fi system may reduce the effect while also giving an overall improvement in sound quality. It may be necessary however to take account of mechanical transformer noise when siting your equipment.
Introduction
In some circumstances, depending on where you live and the earthing arrangements in your home, you may experience radio frequency interference. Controls on broadcasting in some territories allow very high levels of radio frequency radiation and both the choice and exact siting of equipment may be critical. If there is a known problem in your locality it is advisable to arrange for a home demonstration before purchase to find out if Naim equipment is likely to be affected. Susceptibility to radio frequency interference is related to the wide internal bandwidth necessary for high sound quality. Systems incorporating moving coil phono preamplifiers and active crossovers are more likely to suffer. A radio frequency filter kit is available for some Naim equipment but sound quality will be progressively compromised as more elements of the kit are fitted. In situations of extreme radio interference Naim equipment may be unsuitable.
Your Naim hi-fi system can be damaged by lightning. Power amplifiers are particularly at risk and should be turned off when there is risk of lightning strike. For complete protection all mains plugs and any aerial cables should be disconnected when not in use.
Equipment must not be exposed to dripping or splashing and no objects filled with liquid, such as vases, should be placed on the equipment.
Use of non-standard speaker cables or interconnects may invalidate your guarantee.
5 Connection
5.1 mains lead
As the colours of the wires in the mains lead of this apparatus may not correspond with the coloured markings identifying the terminals in your plug proceed as follows:
The wire which is coloured GREEN-AND-YELLOW must be connected to the terminal in the plug which is marked by the letter E or by the safety earth symbol or coloured green or green-and-yellow.
The wire which is coloured BLUE must be connected to the terminal in the plug which is marked with the letter N or coloured black.
The wire which is coloured BROWN must be connected to the terminal in the plug which is marked with the letter L or coloured red.
5.2 non-rewireable mains plugs
If a non-rewireable plug is cut from a mains lead (for whatever purpose) the plug MUST be disposed of in a way to render it totally useless. Considerable shock hazard exists if the cut-off plug is inserted into a mains outlet.
5.3 fuse carrier
Should the plug fuse carrier be damaged or lost, the correct replacement must be obtained from your dealer, or from Naim Audio direct. Do not use the plug until the fuse carrier is replaced.
5.4 plug fuses
Replace only with ASTA or BS 1362 approved fuses.
NOTE
This equipment has been tested and found to comply with the relevant EMC and Safety Standards, and, where applicable, also complies with the limits for a class B digital device, pursuant to Part 15 of the FCC Rules.
These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates, uses and can radiate radio frequency and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning off and on, the user is encouraged to try to correct the interference by one or more of the following measures:
•Reorient or relocate the receiving antenna.
•Increase the separation between the equipment and the receiver.
•Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.
•Consult your Naim dealer or an experienced radio/TV technician for help.
3
NAC 552
6 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 7.3 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.
6.1 source inputs and record outputs
The input selector buttons arranged along the uppermost 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.
Illuminating 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.
6.2 input mapping
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
6.3 socket types and mapping defaults
Input Socket |
Socket |
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Features |
1 |
DIN input |
2 |
DIN input |
3 |
DIN input |
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DIN input/output, unity gain capable |
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DIN input/output, unity gain capable |
6 |
DIN input/output |
7 |
DIN input, power output for Stageline |
8 |
Phono pair |
9 |
Phono pair |
hold prog from 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 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.
6.4 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
4
NAC 552
as previously described. 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.
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.
6.5 av integration (unity gain)
The NAC 552 unity gain function enables an audio-visual processor to be integrated such that the processor’s volume control takes over command of signals connected to selected NAC 552 inputs. Unity gain can be selected only on input sockets 4 and 5 (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 previously described. 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.
6.6 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.
6.7 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.
6.8 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.
6.9 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).
6.10 remote control
The Flash remote handset supplied with the NAC 552 duplicates all configuration options. See Section 16 for more information. The Narcom 3 handset will also control the NAC 552. See Section 17 for more information.
6.11 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.
5
NAC 552 Connections
7.1 Front
source selectors
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mono |
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mute |
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record selectors |
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volume |
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balance |
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7.2 Rear
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in 7 |
rc5 control in |
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NAC 552PS in |
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in 1 |
in 2 |
in 3 |
in 4 |
in 5 |
in 6 |
signal ground |
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in 8 |
in 9 |
NAC 552PS in |
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ch 1 |
ch 1 |
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ch 2 |
ch 2 |
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Inputs 1, 2 & 3 |
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Inputs 4, 5 & 6 |
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Input 7 |
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ch1 |
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ch1 |
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+ve |
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+ve |
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in |
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in |
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ch 2 |
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ch1 |
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ch 2 |
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ch 2 |
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in |
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-ve |
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in |
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-ve |
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-ve |
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Specifications
NAC 552 and NAC 552PS
Input sensitivities: |
75mV, 47kΩ |
Overload margins: |
40dB (all inputs all audio |
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frequencies) |
Main output level: |
0.775V, <50Ω |
Tape output level: |
75mV, 600Ω |
Auxiliary power outputs: |
To suit Stageline or Prefix |
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phono stage, or Headline |
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headphone amplifier. |
Case size (H x W x D): |
87 x 432 x 314mm |
Mains Supply: |
100V. 115V. 230V - 50/60Hz |
(NAC 552PS) |
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6
NAC 552 Connections
7.3 NAC 552 connection to NAC 552PS power supply
NAC 552
additional signal output
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mains in |
NAC 552PS |
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to mono or dual |
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to stereo power |
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mono power |
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amplifiers |
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cable direction marker
Note
For best performance the
Burndy and 5 pin DIN cables should be run as close together as possible.
Interconnect Cables
NAC 552 Burndy 
240° 5 to 5 pin DIN
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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 Supercap.
8.1 source inputs and record outputs |
8.3 automatic input switching |
The input selector buttons arranged along the uppermost 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.
8.2 input socket mapping
The NAC 252 has six DIN input sockets and two alternative pairs of Phono sockets. The 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 prog from 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 button to select or de-select the phono socket input for CD, and the remote handset 6 button to select or de-select the phono socket input for AUX 2. The corresponding front panel input buttons can similarly be used to select or deselect the phono socket inputs. The appropriate input button indicator will flash three times on selection of the 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 record select indicators are restored and the volume indicator stops flashing.
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 previously described. 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.
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