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Burn in/ Warm up
Your audio components need a certain time period
until they reach maximum performance. The duration
of this "warm up" time is very different for the various
elements of your audio system. Higher and homoge-
neous sound quality is achieved while keeping the
device switched on.
Your audio specialist dealer has enough experience
to give you more information.
Net frequency noise
Some audio source devices may in combination with
the amplifier cause a humming noise at power line fre-
quency audible from your speakers. Usually, its volu-
me varies with the volume setting of the amplifier. This
is no sign of a defect or fault of your audio products
but has to be eliminated. Generally, every wall-powe-
red device connected to the ground wire of the power
plug can cause this problem when connected to the
amplifier.
Experience shows that this problem is mainly cau-
sed by antenna-connected components (as TV-sets
or Tuners), personal computers, electrostatic loud-
speakers, subwoofers, record players or headphone
TIPS
amplifiers that are connected to the audio inputs
of the amplifier. Another possible reason for hum-
ming noise is electromagnetic interference of
other components', power supplies with pick-up-
systems of record players (change the place of
the record player for a test).
In most electric devices the ground potentials of all sig-
nals are connected to each other at one central point,
where they have one common connection. If the de-
vice uses the protective conductor of the wall outlet,
the corresponding wire of the line cord is connected
intractably to the metal housing of the device. This is
mostly the point where the central grounding point is
attached to. By doing this the housing is able to shield
all signals from external radiated noise. Some main
amplifiers are equipped with a „Ground Lift" switch.
If it is activated, ground potential of the chassis and
the protective ground wire are being separated from
the central signal ground point. The protective ground
wire keeps its function. Sometimes this helps prevent
noise caused by errors in grounding.
If the problem occurs and cannot be solved by your-
self your audio specialist dealer will help you.
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