NAIM Amplifiers, Owner'S Manual

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33
ch2 ch1
chassis chassis chassis
ground ground
chassis chassis
Signal Inputs
-ve
NAP 6-50
Unused zone input sockets should be fitted with the supplied
yellow shorting plugs. Failure to use the shorting plugs may
reduce the reliability with which the NAP 6-50 drops into standby
mode. Serious damage is likely to occur if yellow shorting plugs
are used on Naim equipment other than the nap 6-50.
The negative input and output connections within each zone
are common but there is no signal negative connection
between them. The mains earth grounds only the case and the
electrostatic screen within the transformer and is not connected
to the signal negative. The mains earth must always be
connected to “ground” regardless of any other equipment used.
In order to avoid hum-loops the signal negative of the whole
system should be connected to the mains earth in one place.
This should be the primary signal source.
47.1 Operation
Once installed the NAP 6-50 is intended to remain permanently
powered-up via its front panel switch. When not in use the
amplifier will drop into “standby” mode during which less than 1
Watt is dissipated. Standby mode is indicated by the front panel
logo illuminating red. Switch from standby to operational mode
47 Installation and Connection
The NAP 6-50 is a six channel power amplifier intended for use in multi-room audio
systems. The six channels are configured as three sets of two (left and right). The three
sets are intended to provide audio power to drive one pair of loudspeakers in three
multi-room “zones”. Audio line level input for each zone is via 4-pin DIN sockets.
The NAPV 175 is heavy and care should be taken when lifting or moving it. Make sure
that the surface it is to be placed on can support the full weight.
takes place automatically when a programme signal is detected
at any input or, alternatively, can be controlled via the 3.5mm
“jack” trigger input socket on the rear panel.
47.2 Protection
The NAP 6-50 uses a fan to assist heat dissipation. Fan speed
is increased automatically in response to an increase in heat
dissipation. If the internal heatsink reaches 70°C due to
prolonged running at very high dissipation, blocked airflow, or
fan failure, the mains supply will be interrupted and the indicator
light will go off until the amplifier has cooled down. This may take
up to thirty minutes.
47.3 Siting
Care should be taken when siting the NAP 6-50 to ensure that
the ventilation and fan apertures are not obstructed.
47.4 Loudspeaker connectors
Special Naim Audio loudspeaker connectors are supplied to
make the connection to the power amplifier(s).
IN ORDER TO
COMPLY WITH CURRENT EUROPEAN SAFETY REGULATIONS IT
IS ESSENTIAL THAT THESE ARE USED.
49 NAP 6-50 Specification
Power Output: 30 Watts per channel, 8
Ω
Channels: Six (in three zone pairs)
Voltage Gain: +29dB
Input Impedance: 18k
Ω
Frequency Response: -3dB @ 3Hz and 50kHz
Standby Consumption: <1W
Trigger Input Voltage: 4.5V to 12V (plug tip +’ve)
Dimensions (H x W x D): 87 x 432 x 314mm
Mains Supply: 100-120V or 220-240V, 50/60Hz
48 NAP 6-50 Rear
mains input
and fuse zone 1
speaker
ch2, right
input
zone 3 zone 2
speaker
ch2, right
zone 3
speaker
ch2, right
input
zone 2
input
zone 1
zone 3
speaker
ch2, left
trigger
input zone 2
speaker
ch2, left
zone
1speaker
ch2, left
Power Amplifier