7
!
R e a d
This
IMPORTANT TIP
You can mix 1/10- and 1/5-octave filters in the same
channel. If you have an especially bad feedback prob-
lem, try making the first few filters 1/5-octave and the
remaining filters 1/10-octave.
TURBO mode speeds up the FBX filter initial-
ization process so that it takes only a few
seconds, and it greatly reduces the volume
level of the feedback during setup.
If the red CLIP LED flashes when no other
signal level LEDs are on, TURBO is on.
TURBO turns off automatically after the first
dynamic filter is set, or you can turn it off
manually by pressing the LOCK FIXED button.
(Press it again to unlock the filters.)
NO! TURBO mode should be turned off either
automatically or manually before your pro-
gram begins. If left on, the 1020 will clip, may
set FBX filters improperly.
If you press LOCK FIXED to turn off TURBO
mode before all the fixed filters have been
set, and you want to use the rest of the fixed
filters, press LOCK FIXED again right away
before a dynamic filter sets. Once a dynamic
filter sets, you will not be able to use the rest
of the fixed filters unless you reset and start
the initialization again.
What is TURBO
m o d e ?
Why won't all the
fixed filters set?
Can the 1020
work during the
program with
TURBO on?
How do I turn off
TURBO?
How do I know
TURBO is on?
ClipGuard
TM
TURBO Mode Guide
NOTE: If you press LOCK FIXED to turn off TURBO mode
before all the fixed filters have been set, and you want to
use the rest of the fixed filters, press LOCK FIXED again
right away — before a dynamic filter sets. Once a dy-
namic filter sets, you will not be able to use the rest of the
fixed filters unless you reset and reinitialize the unit.
WARNING: Follow the setup procedure outlined on the
left, and do not play audio program during TURBO setup
mode. Otherwise, the FBX-1020 will clip and may set FBX
filters improperly. (Clip level is set to the lowest level so
the feedback clips quickly; therefore, your program will
also be clipped in TURBO mode. Be sure a dynamic filter
is set, and if one isn't, press the LOCK FIXED button
before your program begins. Press LOCK FIXED again
if you want FIXED filters to remain active.) You'll know the
1020 is in TURBO mode if the red CLIP LED flashes
when no other signal level LEDs are on. (See "How do
I turn off Turbo?" in the ClipGuard TURBO Mode Guide
above.)
NOTE: Any loud sounds picked up by open microphones
while TURBO is engaged may cause FBX filters to set.
For this reason we recommend maintaining silence as
much as possible during the short time TURBO is
engaged.
If your venue is too noisy to take advantage of TURBO
mode, turn off TURBO by pressing LOCK FIXED on, then
off before you initialize for feedback. Remember: if you
leave LOCK FIXED on, the fixed filters won’t initialize. The
LED indicating LOCK FIXED should be off when initial-
izing.
How To Operate The FBX-1020
Follow these steps to obtain the maximum gain
before feedback without changing the tonal quality of
your program.
1. Place the speakers and microphones in the positions
where they will be used during the program. Avoid placing
microphones directly in front of speakers.
2. If you possess any equipment in the signal path with a noise
gate, you MUST DISENGAGE these noise gates prior to the
setup procedure. You may reengage these noise gates
upon conclusion of your FBX setup. (It is also recommended
to disengage compressors in the signal path)
3. Set the master volumes to their lowest positions. Turn on
the mixer, then the FBX (make sure the FBX is in BYPASS
mode, with the red BYPASS LED on), then any other
accessories and finally the power amp. If you are using a
graphic EQ, adjust only for the desired tonal qualities, but
DO NOT NOTCH FOR FEEDBACK. Adjust the balance for
each mixer channel, and set the sound system’s master
volume to minimum.
4. Press RESET until all LEDs stop flashing.
5. You may set the total number of filters you want to activate
(factory default is 10 filters - skip to #6 if default is OK for your
application) by holding down the SET TOTAL NO. button for
4 seconds. The LEDs will blink 4 times and then go out.
Release the SET TOTAL NO. button. The LEDs will begin
to light in sequence. When the LED corresponding to the
desired number of filters lights, press the SET TOTAL NO.
button. You've successfully set the total number of filters.
6. Now set the number of fixed filters you need (factory default
is 7 fixed and 3 dynamic - skip to #7 if default is OK for your
application). Depress the SET FIXED button for 4 seconds.
The total number of enabled filters set in step 5 will blink
4 times and go out. Release the SET FIXED button, and
the LEDs will begin to light in sequence. When the LED
corresponding to the desired number of fixed filters lights,
press the SET FIXED button. You've successfully set the
number of fixed filters.
7. Press BYPASS to put the FBX in active mode (red LED off).
8. Slowly raise the sound system’s master volume until
feedback occurs. The FBX will quickly remove the feed-
back. The first FILTER LED will then blink to indicate a filter
has been set. Repeat this procedure until all of the FIXED
FILTERS and one of the DYNAMIC FILTERS are set. (The
Clip Level mode LED will go off.)
9. Now lower the master volume slightly so that the system
is not on the verge of another feedback point. This is the
maximum volume level that the FBX will be able to provide.
Higher levels will cause uncontrollable feedback.
10. You're ready to go. ClipGuard™ will automatically match
the input level to the best internal dynamic range.
How To Use The FBX-1020 Features
