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8.6 AV Bypass
The NAIT XS 3 can be integrated within a multi-channel
home theatre system, driving the front left and right channel
speakers, by engaging its AV Bypass mode. AV Bypass
mode enables a home theatre processor to take over volume
control of signals connected to the NAIT XS 3 av input. It is
engaged using the switch on the rear panel. The
NAIT XS 3 volume control indicator will extinguish when AV
Bypass mode is engaged and the av input is selected. The
remote handset volume control will also be disabled.
Note: The AV Bypass feature must be used with care. It
bypasses the NAIT XS 3 volume control leaving any signal
connected to the av input to be passed to the speakers at
full volume.
Note: Inserting a headphone plug while AV Bypass mode
is selected temporarily returns the NAIT XS 3 to normal
operation. Removing the headphone plug will return the
NAIT XS 3 to AV Bypass mode.
Note: The mute function is disabled when AV Bypass
mode is engaged.
8.7 Other Signal Inputs and Outputs
The NAIT XS 3 incorporates RCA phono sub out, DIN pre-
amp out, and DIN power-amp in sockets on its rear panel. In
normal use the pre-amp out and power-amp in sockets are
connected by a link plug. The link plug should be removed
only in the following circumstances:
• A power supply upgrade is to be used.
• An alternative preamplifier is to be used with the
NAIT XS 3 power amplifier. See Section 8.8
• An alternative power amplifier is to be used with the
NAIT XS 3 preamplifier.
Note: The power amp in socket carries a 24V DC power
supply output intended for Naim preamplifiers that
require an external power supply.
The RCA phono sub out sockets provide a stereo output
intended for connection to an active subwoofer. The output
signal is a duplicate of the preamplifier output. No low-pass
filtering is applied.
8.8 Power Amp Mode Operation
If a NAIT XS 3 is to be used as a stereo power amp only it
must be configured to operate in power amp mode:
• With the NAIT XS 3 switched off, remove its rear panel
link plug and connect the interconnect cable from the
preamp or preamp power supply to the power amp in
socket
•
Switch on the NAIT XS 3. The mute button will flash to
indicate that the link plug has been removed. Press and
hold the mute button until it extinguishes. The NAIT
XS 3 is now in power amp mode. Its volume control
indicator and button illumination will extinguish.
•
To return the NAIT XS 3 to normal operation, switch it
off, replace the link plug and switch it on again.
8.9 Power Supply Upgrades
The NAIT XS 3 preamplifier can be upgraded through the
connection of an external Flatcap, Hi-Cap or Supercap
power supply. The NAIT XS 3 and external power supply
must be switched off when connections are made. Switch
on the external power supply first followed by the NAIT XS 3
when all connections are complete.
8.10 General Connections Notes
The NAIT XS 3 negative input and output connections for
each channel are common. The mains earth (ground) should
always be connected regardless of what other equipment is
used in conjunction with the amplifier. The mains earth only
grounds the case and the electrostatic screen within the
transformer, and is not connected to the signal negative. In
order to avoid hum loops, the signal negative of the whole
system should be connected to the mains earth (ground) in
one place.
A signal ground connection is fitted to the NAIT XS 3 rear
panel. This is intended to be used to connect a turntable
pick-up arm signal earth only.
8.11 External Control and Interface
The NAIT XS 3 is fitted on its rear panel with a 3.5mm jack
Remote In socket and a mini-USB interface socket.
The Remote In socket can be used for RC5 remote control
of the NAIT XS 3 via a wired connection or a remote IR
repeater.
The mini-USB socket enables firmware upgrades and
diagnostic tests to be carried out. Contact your Naim
retailer for more information if required.
Note: The mini-USB interface is not intended for the
connection of USB memory devices.
