Naim Audio SUPERNAIT 2 - Manual (Page 6)

E4
SUPERNAIT 2
4.6 AV Bypass
The Supernait 2 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
Supernait 2
av input. It is engaged using the switch on the
rear panel. The Supernait 2 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 Supernait 2 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 Supernait 2 to normal
operation. Removing the headphone plug will return the
Supernait 2 to AV Bypass mode.
Note: The mute function is disabled when AV Bypass mode
is engaged.
4.7 Other Signal Inputs and Outputs
The Supernait 2 incorporates DIN bi-amp (output), 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
Supernait 2 power amplifier.
• An alternative power amplifier is to be used with the
Supernait 2 preamplifier.
Note: When an external preamplifier is connected to the
Supernait 2 power-amp in socket, a fault will initially be
indicated by the Supernait 2 mute button flashing. To clear
the fault, press and hold the flashing mute button. This will
un-mute the amplifier and turn off the display and volume
indicator.
Note: The power amp in socket carries a 24V DC power
supply output intended for Naim preamplifiers that require
an external power supply.
The Supernait 2 DIN bi-amp output socket provides a
preamp output signal that enables a second power
amplifier to be used in conjunction with the Supernait 2
power amplifier.
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.
Diagrams 6.1, 6.2 and 6.3 illustrate some applications of
the Supernait 2 preamp out, power amp in and bi-amp
sockets.
4.8 Power Supply Upgrades
The Supernait 2 preamplifier can be upgraded through the
connection of an external Flatcap, Hi-Cap or Supercap
power supply. Diagrams illustrating power supply upgrades
are shown in Section 6. The Supernait 2 and external power
supply must be switched off when connections are made.
Switch on the external power supply first followed by the
Supernait 2 when all connections are complete.
4.9 General Connections Notes
The Supernait 2 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 Supernait 2 rear
panel. This is intended to be used to connect a turntable
pick-up arm signal earth only.
4.10 External Control and Interface
The Supernait 2 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 Supernait 2 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.