Vincent
3
39
9
3
38
8
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 homogeneous sound quality is achie-
ved 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 mostly the point where the cen-
tral grounding point is attached to. By doing this
the housing is able to shield all signals from exter-
nal radiated noise. Some main amplifiers are
equipped with a "Ground Lift" switch. If it is acti-
vated, ground potential of the chassis and the pro-
tective ground wire are being separated from the
central signal ground point. The protective ground
wire keeps its function. Sometimes this helps pre-
vent noise caused by errors in grounding.
If the problem occurs and cannot be solved by
yourself your audio specialist dealer will help you.
TIPS
Operation
Button(s)
Description
Change the bass pro-
portions of the sound
BASS (6)
With the “BASS” control dial on the front of the device you affect the pro-
portion of lower frequencies in the sound. Turning it in clockwise direction
increases the bass intensity and moving it in anticlockwise direction redu-
ces it. In the middle setting the bass proportions of the input signals remain
unchanged. The adjustment of the bass control only has an effect if the but-
ton “TONE” (5) has been pressed. This tone control affects the loudspea-
ker and headphone signals as well as the output “PRE OUT” (14). The
signal of the output “REC OUT” (13) is independent of this.
Switch off tone control
(BASS/TREBLE)
TONE (5)
If the sound is not to be changed, it is recommended that you switch off
the sound control (BASS, TREBLE) with this button on the front of the devi-
ce. When this button is pressed, the sound processing settings in the tone
controllers (6)(8) come into play. If the button is not pressed, the two
sound controllers in the preamplifier are bypassed and the signals from the
source are not changed in terms of their frequency levels. The tone control
affects the signal of the loudspeakers and the “PRE OUT” output (14). The
signal of the “REC OUT” output (13) is unaffected by this.
Switch the audio signal
correction for low volu-
me on and off
LOUD (5)
This function is operated from the front panel. It is a feature of audio amplifiers
that permits the user to strengthen low and high frequencies compared with
middle frequencies at the touch of a button. It thereby corrects the impression
of volume at low volume. In an audio system, when the volume is small, low
and high frequency ranges are insufficient because of the characteristic of
human auditory sensation. This function should only be used at low volume. It
has no effect on the signal of the output “REC OUT” (13).
Individually activate or
deactivate speaker out-
puts A and B
SPEAKERS
(4)
With this dial you can switch both pairs of loudspeakers (A and B) on and
off in any desired combination. If this dial is set to “A”, only the pair of
loudspeakers connected to the “SPEAKER A” connectors receives the out-
put signal. If the dial has been set to “B”, only the pair of loudspeakers
connected to the “SPEAKER B” connectors receives the output signal. In
the dial setting “A+B”, both pairs of loudspeakers are fed at the same time
by the amplifier. In the “OFF” dial position both pairs of loudspeakers are
switched off. In contrast to the mute setting (MUTE), the output signal of the
preamplifier “PRE OUT” output (14) remains active in each of these cases.
OPERATING THE APPLIANCE
