User Manual

“FBS/AGC” screen Chapter 4. System screen
MTX-MRX Editor User Guide
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Performing FBS detection for the FIXED type
In order to obtain good results, you should set up the mics, speakers, and other sound
equipment, and adjust the output EQ settings before performing detection. If you want,
FIXED can also be used in conjunction with DYNAMIC.
1. Adjust the power amp output volume.
While vocalizing into the mic, gradually raise the power amp output to the volume
at which the system will be operated in actual use. In addition, clap your hands and
verify that feedback does not occur.
2. Maintain silence in the space for which you want to suppress feedback.
3. Select the input channels in MTX-MRX Editor.
4. Click the [FBS/AGC] button.
5. Click the FIXED [DETECT] button to open the detection start screen.
6. Click the [START] button in the detection start screen. Detection will
start.
Raise the faders little by little during detection. You can make fine adjustments by
operating the mouse wheel.
Feedback will occur, but the MTX will immediately detect that frequency and insert
a filter. Repeat this operation. When you have obtained a satisfactory result, click the
[STOP] button to end the procedure.
7. After detection has ended, click the [CLOSE] button to close the screen.
• The indicator will light when the following occurs.
-When a frequency is displayed
-When a currently-displayed frequency is rewritten
• If you don’t notice any result, it may be that detection has failed. Click the [CLEAR] button
to discard the detection result. If you want to make the settings once again, adjust the
position of the mics and speakers, adjust the volume, and try the above procedure once
again from step 1.
In some cases, detection will not occur correctly if the overall volume is raised excessively,
or if the mics and speakers are too close, or if sound from a speaker is directly entering a
mic.
• When using FIXED, calculation will continue repeatedly even after all seven filters have
been displayed, for example to combine the frequencies that are closest to each other.
However when using DYNAMIC, if all seven filters are already displayed but new feedback
is found, the filter that was specified first and that will have the least effect on the audio
quality will be discarded, and replaced by the newly-specified filter. A filter will be
discarded automatically after a certain length of time has elapsed since it was applied.
• It is not possible to completely eliminate all feedback in all environments.
• If feedback increases when you raise a fader, and is not automatically suppressed, lower
the fader to prevent the speakers from being damaged.
The MTX cannot detect multiple feedback points simultaneously. Settings will be easier if you
raise the fader slowly so that feedback occurs gradually.
NOTE
HINT