Naim-audio NAC-N 172 XS User Manual download pdf (Page 5)

NAC 552

4 NAC 552 Introduction and Installation

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 5.2 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.

The preamplifier and power supply should be installed on a dedicated equipment stand

intended for the purpose. Do not stand either directly on top of another item of equipment.

Care should be taken to ensure that the preamplifier is level. The units are heavy and care

should be taken when lifting or moving them. Make sure that the surface on which they are to

be placed can support their weight.

The preamplifier and power supply should be installed in their final locations before

connecting cables or switching on. Ensure that power amplifiers are switched off and that

the preamplifier volume is turned down before the power supply is switched on. The power

button is located on the power supply front panel.

The following paragraphs describe installation features and functions specific to the NAC 552.

Operational features common to all preamplifiers are described in Section 14.

Both R-Com and NARCOM 4 remote handsets are included with the NAC 552. The R-com is

intended for day-to-day use while the NARCOM 4 can be used for handset-based setup and

programming.

4.1 Source Inputs and Record Outputs

The input selection 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, is 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.

4.2 Input Socket Assignment

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 assignment could enable any input socket to be selected by

pressing the cd button. Assigning of each record button follows

the corresponding source button.

Input assignment setup is accessed through the NAC 552

program mode. To switch into (or exit from) program mode

press and hold the prog key on the NARCOM 4 remote handset

(in preamplifier mode). Program mode is indicated by a flashing

indicator on the front panel volume control and the record

selection indicators extinguishing.

Note: 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

assigned 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 assigned.

To change the input socket assigned 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 assigned to a source button the

indicator above the socket will flash repeatedly. It is possible

to assign one input socket to more than one source button but

NOT to assign multiple input sockets to one source button. The

remote handset record mute and mono functions can also be

used to set up input assignment.

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.

Table 4.3 illustrates the NAC 552 default input assignment.

Operational features

common to all

preamplifiers are

described in Section 14.

1 2 3 4 5 6 7 8 9 10 ... 23 24

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Naim-audio NAC-N 172 XS User Manual Page 5

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