NAIM 300 Series User Manual page 12

For example:
· Adding more capacitance may reduce any perceived system forwardness.
· Making the resistance lower can help counteract any perceived excessive liveliness
· Switching between high and low gain may help match input levels across a system.
If you use a moving magnet cartridge, set the mode to MM. When using the NVC TT in
MM mode set the MC gain to high and the loading values to 1k and 100pF.
4.7 Naim Logo Brightness Settings
The brightness of the product logos can be set using the rear panel switch on the NVC TT
or the rear panel push button on the NPX TT.
4.8 USB Update
The NPX TT has a micro-USB socket on its rear panel for service use only.
5. Mains Power, Earthing and More
Only use the mains lead and plugs supplied with your Naim products, or the upgrade Naim
Power-Line mains lead.
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, if your turntable has a mains earth and you have a Naim streamer in the
system, its ground lift switch should be set to "Floating". This is the best setting for sound
quality.
5.2 Equipment Fuses
Mains powered Naim Audio equipment is fitted with a mains fuse on the rear panel
adjacent to the mains input socket. If necessary; replace it only with the spare fuse
supplied or with an identical fuse. Repeated failure of the fuse indicates a fault that should
be investigated by your retailer or Naim itself.
Where fused plugs are used, 13 amp fuses should be fitted. Fuses of a lower rating will fail
after a period of use. Do not wire voltage dependent resistors or noise suppressors into
mains plugs. They degrade the mains supply and the sound.
5.3 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.
5.4 Mains Circuits and Cables/Interference
A hi-fi system usually shares a mains power circuit with other household equipment, some
of which can cause distortion that may manifest mechanical hum from mains transformers,
including the transformer in your NPX TT.
Transformer hum is not transmitted through the speakers and has no effect on the
performance of the system; however, a careful positioning of your Naim system may
reduce it, as may a separate, dedicated mains circuit. Such a circuit (ideally with a 30 or
45 Amp rating) generally also improves system performance. Only seek advice on the
installation of a separate mains circuit from a qualified electrician.
5.5 Radio Interference
In some circumstances, depending on where you live and the earthing arrangements of
your home, you may experience radio frequency interference. Controls on broadcasting in
some territories allow very high levels of radio frequency radiation and both the choice and
exact location of the equipment may be critical.
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