Naim Audio HeadLine - Manual (Page 4)

2
waveform. This distortion can in turn lead to
mechanical hum from mains transformers.
some naim transformers are large in size,
making them relatively sensitive to such
distortion, and it may be necessary to take
account of transformer hum when siting your
equipment.
Transformer hum is not transmitted through
the speakers and has no effect on the
performance of the system; however, a
separate mains circuit may reduce it. such a
circuit (ideally with a 30 or 45 amp rating) will
also generally improve system performance.
advice on the installation of a separate
mains circuit should be sought from a
qualified electrician.
use only the mains leads and plugs supplied
or the naim power-Line mains cable.
3 General Installation
Naim equipment is designed to offer the
finest performance possible avoiding
compromise wherever practical. This
can lead to circumstances that may be
unfamiliar. The notes that follow contain
advice specifically related to Naim
equipment as well as more general
warnings about the use of domestic audio
products. Please read them carefully.
3.1 Siting The Equipment
in order to reduce the risk of hum audible
from the loudspeakers, power supplies
and power amplifiers should be located
a reasonable distance away from other
equipment. The maximum separation
distance for connected equipment is that
allowed by the standard interconnect lead.
some naim equipment is extremely heavy.
Check the weight of the equipment prior
to lifting and if necessary use more than
one person so that it can be moved safely.
ensure that your equipment rack or table
can easily support the weight and is stable.
3.2 Switching on
source components and power supplies
should be switched on before power
amplifiers. always switch amplifiers off
and wait a minute before connecting or
disconnecting any leads. always use the
power switch on the product rather than a
mains outlet switch.
a “thump” may be heard from the
loudspeakers as power amplifiers are
switched on. This is normal, will not cause
any loudspeaker damage and does not
point to any fault or problem. a mild “pop”
may also be heard shortly after equipment is
switched off.
3.3 running In
naim equipment takes a considerable time
to run in before it performs at its best. The
duration varies, but under some conditions
the sound may continue to improve for
over a month. better and more consistent
performance will be achieved if the system
is left switched on for long periods. it is worth
remembering however that equipment left
connected to the mains can be damaged
by lightning.
3.4 radio Interference
in some circumstances, depending
on where you live and the earthing
arrangements in 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
siting of equipment may be critical.
susceptibility to radio frequency interference
is related to the wide internal bandwidth
necessary for high sound quality. a radio
frequency filter kit is available for some
naim equipment but sound quality will
be progressively compromised as more
elements of the kit are fitted. in situations of
accessories