NAIM AV2 Owner's Manual page 27

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13.0 nap v175 installation and operation
13.1 connections
The nap v175 is a three channel power amplifier intended for use in audio-visual home-
theatre systems. The three channels provide audio power to drive a centre channel speaker
and a pair of either main front or surround channel speakers. Audio line level input is via
two 4-pin DIN sockets - one for the centre channel and one for the main or surround pair.
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.
13.2 operation and protection
Once installed the nap v175 is intended to remain permanently powered up via its rear
panel switch. If the internal heatsink reaches 70°C due to prolonged running at very high
dissipation 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.
13.3 loudspeaker cable and connectors
Naim Audio speaker cable should be used to connect a loudspeaker to the output of the
nap v175. Special Naim Audio loudspeaker connectors are supplied to make the
connection to the power amplifier(s). IT IS ESSENTIAL THAT THESE ARE USED, IN ORDER
TO COMPLY WITH CURRENT SAFETY REGULATIONS.
DO NOT, FOR ANY REASON, USE SO CALLED HIGH DEFINITION WIRE OR ANY OTHER
SPECIAL CABLE BETWEEN POWER AMPLIFIER AND LOUDSPEAKER AS DAMAGE MAY
RESULT.