12
About the Safety Margin
At the completion of Auto Adjust, a “safety margin”
of approximately 12 dB will have been set up.
However, during the Auto Adjust procedure, the
Auto indicator will begin to flash rapidly as soon as a
safety margin of 6 dB has been achieved. This
conveniently allows you to stop Auto Adjust while it
is in progress, if you believe that a 6 dB margin is
sufficient for your needs.
* Auto Adjust ends when all twelve anti-feedback filters
are set, even if the approximately 12 dB for the safety
margin is not attained. You can check to see whether or
not all the anti-feedback filters have been set when the
lock function is set to “On” (See “About the Lock
Function”).
About Anti-Feedback Filter
Bandwidth
You can modify the bandwidth of the anti-feedback
filters by changing the position of the “FILTER WIDE”
switch.
FILTER WIDE: On
Filter Bandwidth:1/10 Octave (Max. 1/6 Octave)
Characteristic:
Greater Elimination of Feedback
FILTER WIDE: Off
Filter Bandwidth:1/20 Octave (Max. 1/10 Octave)
Characteristic:
Less Extreme Effect on Sound
Quality
* Once the anti-feedback filter settings are fixed, changing
the Filter Wide switch will not affect the filter bandwidth.
* When frequencies that are extremely close to each other
are feeding back, the filter bandwidth is automatically
slightly broadened, and feedback from multiple
frequencies is removed with one filter.
* A bandwidth of 1/20 of an octave corresponds to the
definition achieved with a 200-band graphic equalizer.
About the Lock Function
Turning on the Lock function disables the [START],
[SET], and [CLEAR] buttons, so even if they are
pressed in error, filter settings remain unchanged.
When carrying out Auto Adjust, press these settings
buttons after turning off the Lock function. After you
finish the Auto Adjust procedure, turn the Lock
function on once more.
* If the Lock function is set during the Auto Adjust
procedure, Auto Adjust ends at that point, and the anti-
feedback settings are fixed (this also happens if the [SET]
button is pressed).
Checking the Status of the Filter
Settings
With the lock function set to “ON,” you can check to
see whether all settings for the twelve anti-feedback
filters have been made.
After checking to see that the Lock switch is set to
“ON,” press the [START] and [SET] buttons
simultaneously. While they remain pressed
simultaneously, the Auto Indicator flashes.
Slow flashing:
Fewer than twelve of the anti-feedback filters are
set; approximately 12 dB is secured for the safety
margin.
Rapid flashing:
All twelve anti-feedback filters are set. If at this
point you wish to ensure a greater safety margin,
then readjust the volume levels, and the placement
of the microphone and speakers, and repeat Auto
Adjust from the beginning.
