LIT-FBX2410-OP-EN-110516.pmd
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1 Sabine, Inc.
SeCtIon SIX — troUBleSHootInG tIPS
Q. Can I place the FBX in the mixer’s EQ loop?
Q. Why does my system sound thin and muffled?
A. Place the FBX in BYPASS MODE. If the system still sounds
thin, your problem is probably improper use of a graphic EQ.
If the problem is really the FBX, re-initialize the system and
make sure the READY button LED is on steadily.
Q. Why does my program sound clipped and distorted?
A. Make sure you are not in Setup mode. Setup mode turns
off automatically after the first dynamic filter is set, or you
can turn it off manually by pressing the READY button. See
Section 4.2 for information on Setup mode.
Q. Can I patch two FBX channels together for twice the
filters?
A. Yes; connect the output of one FBX channel to the input of
the other channel. Place the FBX between the output of the
mixer and the input of a power amp, and set up the channels
sequentially. When combining channel A with channel B on
an FBX2410, bypass channel B while setting up channel A,
then lock channel A’s fixed filters (all channel A’s filters should
be fixed) by pressing channel A’s READY button on the front
panel after setup. The blue READY LED should remain lit.
Q. Why doesn't the FBX2410 filter feedback immediately?
A. Four possible reasons:
1. Lower frequencies may take longer than higher ones.
2. Check input level of signal at the unit and set gain so the
signal level LED's on the unit light up.
3. It may be patched in an "effects loop", not directly in the
signal path. This WILL NOT WORK.
4. You may have used all 12 filters. Dynamic filters will con
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tinue to operate by notching feedback frequencies as they
occur, but ultimately, gain will exceed filter capacity.
A. Yes.
Q. Can I place the unit in the mixer effects loop?
A. Avoid this configuration. You can configure the system this way
only if each effects send of each mixer channel is set so that
all of the signal is routed completely through the effects loop.
You cannot mix dry signal with effects signal and still control
feedback.
Q. The signal input LEDs do not light. The unit will not catch
feedback. Why?
A. The unit is not in the signal path. Check the connections. Be
sure that the program is interrupted when the input is discon-
nected from the back of the unit.
Q. Can I mix balanced and unbalanced inputs and out
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puts?
A. Yes. An unbalanced input and balanced output is compatible.
Refer to section 5.3. for more details.
Q. Why does one of the FILTER ACTIVITY LEDs blink?
A. The last filter to be automatically updated blinks. During normal
operation, the blinking will move from filter to filter as they are
reset. This gives the user a visual confirmation that the unit is
responding to new feedback and is functioning properly.
Q. Sometimes during the initial setup, the first filter LED will
blink before any feedback has been introduced into the
system. Why?
A. The FBX will set a filter if the system has a hum. Check for
bad grounds. Try resetting the filters and/or the Ground switch
on the rear panel.