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You can now power up the NAP 250 either by turning on your Naim
preamplifier – connected via System Automation – or by simply pressing the
power button on the front panel of the power amplifier.
It is the same procedure to switch off your NAP 250: turn off your Naim
preamplifier – connected via System Automation – or simply press the power
button on the front panel of the power amplifier, which will put it into standby.
Avoid using a mains outlet switch to turn your amplifier off.
4.6 Standby Power Settings
By default, the NAP 250 is set to 'Auto Standby' - it automatically enters
Standby mode (where it consumes less than 0.5W of power) after 19 minutes
of inactivity. Music Sensing will wake the amp from Standby when it detects an
input signal.
For the optimum sound quality, switch the Standby setting on the rear panel to
'Instant on', which keeps all sensitive audio circuits permanently powered up.
Please note Music Sensing is disabled when it receives a system automation
command; if the NAP 250 is manually put into Standby via the Standby button,
or when 'Instant On' is enabled.
4.7 Naim Logo Brightness Settings
You can choose the brightness level of the Naim logo on your NAP 250. If you
are using a Naim preamplifier connected via System Automation, you can
synchronise the brightness of both logos from the preamp. Alternatively, you
can set the NAP 250 via the brightness toggle switch on the rear panel.
PLEASE NOTE: the brightness button also functions as a full NAP 250 reset
button when it is pressed for 3 seconds, so it is best to make your logo
brightness choices quick and decisive!
4.8 USB Update
Your NAP 250 has a micro USB terminal, but this is for service use only.
5. Mains power, Earthing and More
Use only the main leads and plugs supplied with your NAP 250, or the upgrade
Naim Power-Line mains cable. Where fused plugs are used, 13 amp fuses
should be fitted. Do not wire voltage dependent resistors or noise suppressors
into mains plugs; they degrade the mains supply and the sound.
5.1 Earthing
In order to avoid hum loops, the signal ground of the whole system should
be connected to the mains earth in one place. Typically, this is at the primary
source. For example, a Naim streamer has a ground lift switch. Set this to
"default" if no other source connects mains earth to signal ground. This setting
will give best sound quality.
5.2 Non-rewirable Mains Plugs
If a non-rewirable plug is cut from a mains lead (for whatever purpose) the plug
MUST be disposed of in a way to render it totally useless. Considerable shock
hazard exists if the cut-off plug is inserted into a mains outlet.
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