Naim-audio NAP 500 User Manual download pdf (Page 5)

NAC 552 Preamplifier

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 5.3 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.

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 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 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 following

Section 4 paragraphs describe installation features and functions specific to

the NAC 552. Operational features common to all preamplifiers and integrated amplifiers

are described in Section 28.

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 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.

Operational features

common to all

preamplifiers and

integrated amplifiers

are described in

Section 28

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Naim-audio NAP 500 User Manual Page 5

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