20
Vincent
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 diffe-
rent for the various elements of your audio system.
Higher and more homogeneous sound quality is
achieved while keeping the device switched on.
Your audio specialist dealer has enough experi-
ence 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 frequency audible from your speakers.
Usually, its volume 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-powered 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 headpho-
ne amplifiers that are connected to the audio
inputs of the amplifier. Another possible reason for
humming 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
signals are connected to each other at one central
point, where they have one common connection.
If the device 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 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 equip-
ped 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
yourself your audio specialist dealer will help you.
TIPS
OPERATING THE APPLIANCE
Operation
Button(s)
Description
Switch on
and off
POWER (2)
The headphone amplifier is switched on and off using this switch at the front panel. It
has no standby option. If the switch has been pressed in the upper position the device
is switched on. When switched off the device is internally separated from the AC
power. When switched on the Power LED (1) is lit. As a precaution, before switching
on, the Volume setting (3) should be reduced.
Change the
headphone
Volume
LEFT
RIGHT (3)
Turn the knob “LEFT” and “RIGHT” clockwise to turn up the Volume of the headphones
and counter-clockwise to turn it down. Before plugging in your headphones turn down
the Volume as a precaution.
Summary of Contents for KHV-111MK
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