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E13
NAC 152 XS Preamplifier
16 NAC 152 XS Introduction and Installation
The NAC 152 XS 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. Diagram 17.3 illustrates the NAC 152 XS
connected to a FlatCap XS power supply.
The preamplifier and any power supply should be installed on a dedicated equipment
stand intended for the purpose. Do not stand either preamplifier or power supply directly
on top of another item of equipment. Ensure that the preamplifier is level.
The preamplifier and any power supply should be installed in their final locations before
connecting cables or switching on. Ensure that the preamplifier volume is turned down
before switching on.
The following Section 16 paragraphs describe installation features and functions specific
to the NAC 152 XS. Operational features common to all preamplifiers and integrated
amplifiers are described in Section 28.
16.1 Audio Inputs
The input selection buttons select the source input signal
to be routed to the preamplifier outputs and the power
amplifier.
The NAC 152 XS has six DIN input sockets and five pairs
of RCA Phono sockets. The RCA Phono sockets are
permanently connected in parallel with their respective
DIN sockets. RCA Phono and DIN sockets for the same
input should not be connected simultaneously.
Note: The aux2 DIN input socket carries a power supply
output voltage appropriate for a Naim phono preamplifier.
A 3.5mm stereo Jack input socket suitable for an iPod (or
alternative portable music player) is also provided on the
NAC 152 XS front panel. This input is connected in parallel
with the aux 1 DIN and RCA Phono sockets.
Insertion of a plug into the front panel socket will
automatically switch the preamplifier to that input.
Removal of the plug will return the amplifier to the
previously selected input. If a different input is selected
while a plug is inserted, removal of the plug will not cause
the input to change.
16.2 Audio Outputs
The NAC 152 XS provides subwoofer and line level outputs,
each via a pair of RCA Phono sockets.
The line level output simply reflects the selected input
signal while the subwoofer output is a duplicate of
the main preamplifier output (i.e it is affected by the
preamplifier volume control).
16.3 Power Supply Upgrades
The NAC 152 XS can be powered by a Naim power
amplifier incorporating a preamplifier power supply or its
performance upgraded through the connection of one or
more external power supplies. Power supply upgrades can
be carried out in stages:
Stage 1 is to connect an i-Supply, Flatcap, Hi-Cap or
Supercap power supply to the NAC 152 XS Upgrade 1
socket. The link/blanking plug inserted in the Link 1 socket
must be removed.
Stage 2 is to connect a Flatcap, Hi-Cap or Supercap
power supply to the NAC 152 XS Upgrade 2 socket. The link
plug fitted to this socket must be removed. With a second
power supply added, the NAC 152 XS no longer requires a
power supply from the power amplifier, which should now
be connected via the Stage 2 power supply.
Diagrams illustrating both power supply upgrade stages
are shown in Section 17.
Note: Link plugs must only be inserted in the sockets from
which they were removed and unused power supply
sockets must not be used for any other purpose. Incorrect
use of link plugs and power supply sockets risks significant
damage to the power supply or preamplifier.
Note: A wide variety of different power supply schemes
are potentially possible for the NAC 152 XS, including the
use of one Flatcap for both upgrade stages. Your local
retailer will be able to advise on the best scheme for your
particular system.
Note: The NAPSC power supply cannot be used with the
NAC 152 XS.
Operational features
common to all
preamplifiers and
integrated amplifiers
are described in
Section 28
iPod is a trademark of Apple Inc., registered in the U.S. and other countries
15


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