Bedienungsanleitung Naim NAC 252 (Seite 8 von 24) (Englisch)

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NAC 252

7 NAC 252 Introduction and Installation

The NAC 252 preamplifier does not incorporate an internal power supply and can be used

only in conjunction with a SuperCap power supply. Diagram 8.2 illustrates connection of the

NAC 252 to a SuperCap power supply.

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 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 power supply is heavy and care should be taken when lifting or moving it. Make sure that

the surface on which it is to be placed can support its weight.

The following paragraphs describe installation features and functions specific to the NAC 252.

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

7.1 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, 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 mon button four times

within six seconds.

7.2 Input Socket Assignment

The NAC 252 has six DIN input sockets and two alternative

pairs of RCA Phono sockets. The RCA Phono sockets can be

assigned individually to the cd and aux 2 input buttons in place

of the DIN sockets.

Input assignment setup is accessed through the NAC 252

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 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.

7.3 Record Mute

At times when the NAC 252 record outputs are not required

it is good practice to mute them in order to minimise power

consumption and maximise sound quality.

To engage the NAC 252 record mute simply press the record

(lower) bank front panel mute button.

7.4 NAC 252 Signal Outputs

To ensure correct continuity of system earth connections

the NAC 252 signal output is routed via the SuperCap power

supply. The SuperCap is fitted with multiple DIN signal output

sockets that enable the downstream connection of a stereo

power amplifier, a dual mono power amplifier or two separate

mono power amplifiers.

7.5 Auxiliary Power Output

The NAC 252 Aux 2 input (In 6) is provided with primary and

alternative DIN sockets. The lower, alternative, socket, fitted

at manufacture with a removable cover, is intended for use

with a Naim Audio StageLine or SuperLine phono stage and

incorporates an appropriate DC power supply. The primary and

alternative sockets must not be used simultaneously.

Operational features

common to all

preamplifiers are

described in Section 14

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