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The following explains the basic settings of the SN-550.
@ Switch on the SN-550 and the connected units.
Switch
on the power
amplifier
( or guitar amplifier ) last.
(Switch the units off in reverse order. )
* This unit is equipped with a circuit protection device.
A
brief interval after power up is required before the unit will
operate.
*When
the SN-550
is switched
on, the Line Frequency
mode in the hum canceler and the noise canceler will be
automatically selected.
@) Feed the audio signal into the SN-550.
Set the Internal
Level Control
Knob
so that the Internal
Level Meter
reads between
— 18 and OdB; the CLIP indicator
should not light. When using a stereo signal, set both
the channels to the same position.
*When
the CLIP indicator is lit, the signal is not being
processed properly.
@) set each
channel
of the hum
and noise cancelers
depending on the conditions:
* lf you change the internal level after having set the noise
and hum cancelers, set each threshold level again.
<To
remove
the hum
caused
by power
supply
line >
To remove the hum picked up through a microphone or guitar or
caused
by a variable lighting system,
set the hum canceler as
indicated below.
If the hum has not been reduced, set the basic
frequency using the manual mode. ( See next column. )
@ Press the Hum Cancel Line Frequency Button.
( This
will automatically adjust the basic frequency of the hum
canceler to the power supply frequency. )
Q win no audio signal present, rotate the Hum Cancel
Threshold Knob clockwise from the MIN position so that
the hum disappears.
@) wie
an
audio
signal
is present,
adjust the
Hum
Cancel
Threshold
Knob:
find
the
position
which
provides minimum tonal alteration.
WSETTING
< To
remove
hum
from
other
sources
>
To remove the hum caused by a CRT display or computer ( that is
not related to the power supply frequency ), set the hum canceler
as follows.
@® Press the Hum Cancel Manual Button.
@) Set
the
Hum
Cancel
Threshold
Knob
to the
MAX
position and adjust the basic frequency using the Hum
Cancel Frequency Knob unti! the hum disappears.
(3) wii
no audio signal present, rotate the Hum
Cancel
Threshold
Knob clockwise from the MIN position until
the hum disappears.
@) white an audio
signal is present,
adjust the Hum
Cancel
Threshold
Knob:
find
the
position
which
provides minimum tonal alteration.
< To remove
white
noise"
hiss
noise >
If you wish to remove the white noise generated by the connected
units or noise picked through a microphone or analogue tape hiss,
set the noise canceler as follows.
@ Press the Noise Cancel Button to turn on the noise
canceling function.
@ With no audio signal present, rotate the Noise Cancel
Threshold Knob clockwise from the MIN position so that
the noise disappears.
) white an audio signal is present,
adjust the Noise
Cancel
Threshold
Knob:
find
the
position
which
provides minimum tonal alteration.
<To
remove
hum
and noise >
If noise or hum is heard while no audio signal is present, first set
the hum canceler and then the noise canceler.
While an audio
signal is present, set each threshold level of each channel.
Again,
find settings which degrade the input signal as little as possible.
* The SN-550's hum canceler circuitry appears first in the
signal path.
Be sure to set the hum canceler first, then the
noise canceler.
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