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@D Noise Canceling Buttons ( A, B )
Noise Cancel Threshold Knob ( A, B )
(©) Hum Cancel Mode
Buttons ( A, B )
D Noise Canceling Buttons ( A, B )
These buttons switch the noise canceling function on and off.
When on, the indicator will light.
Noise Cancel Threshold Knob ( A, B )
This knob sets the input level at which the noise canceler starts
working.
© Hum Cancel Mode Buttons ( A, B )
These buttons select either the Line Frequency or Manual hum
canceling mode.
When selected, the indicator will light.
@ Line Frequency Button
Press this button to remove
the hum
generated
by the power
supply line. When it is turned on, the basic frequency of the hum
canceler will synchronize to the power supply frequency.
@ Manual Button
Press this button to set the basic frequency of the hum canceler
with the Frequency Control Knob.
* The Line Frequency button covers hum noise whose basic
frequency is from 40.0 to 500 Hz.
When this range is
exceeded, the button will flash and the display will respond
as shown below, indicating that the hum canceling function
is not working.
below 40.0 Hz:
LO. F.
over 500. Hz:
HI. F.
*You can select a different mode for each channel, but not
two modes for one channel at the same time.
MPANEL
DESCRIPTION
@ Hum Cancel Frequency Knob ( A, B)
@ Hum Cancel Threshold Knob (A, B )
@ Power Switch
Hum Cancel Frequency Knob ( A, B )
This sets the basic frequency for the hum canceler.
Variable range:
40.0 — 49.0Hz ( 0.1Hz steps )
49.0 — 50.0Hz ( 0.2Hz steps )
* When the Hum Cancel Mode is set to Line Frequency, the
basic frequency
is automatically
set to match
the power
supply frequency,
and therefore the position of the Hum
Cancel Frequency Knob is irrelevant.
QD Hum Cancel Threshold Knob (A, B )
This knob adjusts the input level at which the hum canceler starts
working.
* The Hum
Cancel Threshold
Knob works when
either the
Line Frequency or Manual mode is selected.
(PF) Power Switch
This switches the SN-550 on and off.
* When the SN-550 is switched on, the Hum Cancel function
is automatically
set to Line Frequency
and the Noise
Cancel function is activated.
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