SABINE FBX-2020 Operations Instructions download pdf (Page 8)

The remaining filters will be your dynamic filters.

7. Press the Bypass button to put the FBX in active mode for the

channel you want to set (red LED off).

8. Slowly raise the sound system’s master volume for the

channel being set until feedback occurs. The FBX will quickly

remove the feedback. 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. TURBO setup mode goes off automatically.

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. We recommend you press LOCK FIXED to lock the Fixed

filters at their current depth. See the Features section below

for a complete explanation.

11. Channels A and B must be set individually and separately.

To set the second channel, turn down the volume for the first

channel, then bypass the first channel and repeat this system

initializing procedure.

12. You’re ready to go. Make sure TURBO mode is off (clip LED

not flashing). ClipGuard™ will automatically match the input

level to the best internal dynamic range.

How To Use FBX-2020Plus Features

Using the “LOCK FIXED” feature:

In rare situations the FBX may mistake music for feedback and

drive the fixed filters deeper than necessary, such as in a church

with a pipe organ or during a performance with a great deal of

intentional sustained electric guitar feedback. You can prevent

the fixed filters from deepening beyond their preset depth by

pressing the “LOCK FIXED” button on the front panel. The “LOCK

FIXED” LED will light to indicate that the FBX is in “LOCK FIXED”

mode. The fixed filters will stay locked until you press the “LOCK

FIXED” button again. The dynamic filters are not affected.

Selecting filter width:

If you’re using the FBX for a music application, the standard 1/10-

octave constant “Q” filter is most effective. However, in spoken

word applications, such as lectures or teleconferencing, we rec-

ommend using the wider 1/5-octave filter for more robust feed-

back control. You may enable the 1/5-octave filters by pressing

the “FIFTH OCTAVE” button, and the built-in LED will light. Only

filters set after pressing the button in will be 1/5-octave. Press the

button again to set subsequent filters to standard 1/10-octave

filters.

Important Operating Considerations

Memory:

The FBX stores the positions and depths of the filters in nonvolatile

internal memory when the unit is turned off or during a power

failure. The unit will return all filters to their previous frequencies

and depths when it is turned back on.

Bypass Mode:

The FBX has a true power-off bypass. The signal is unaffected in

BYPASS MODE even if the unit is turned off. Please note that if a

combination of BALANCED and UNBALANCED inputs and out-

puts is used, the signal may be disconnected or attenuated in

BYPASS MODE.

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 initializing.

Reset Options

The Reset button has two functions: You can reset all the FBX

filters, or just the Dynamic Filters. Hold the reset button in and all

the filter LEDs will begin flashing. To clear only the Dynamic filters,

release the Reset button when the Dynamic filter LEDs go off

(after three flashes). To clear all the filters, do not release the

Reset button until all the filters LEDs go off. A full reset is

recommended whenever you change speaker or microphone

positions. NOTE: Factory default is 9 Fixed and 3 Dynamic filters,

so if you reset Dynamics only those three lights will go out during

reset. And remember, whenever you perform a full reset you will

automatically be in TURBO mode.

WARNING:

Do not reset all filters during the program. This

releases all the feedback you eliminated during setup.

Use

extreme caution

when resetting the Dynamic filters, because you

may need those filters at that moment during the show.

How To Operate The FBX-2020Plus

Follow these steps to obtain the maximum gain before feedback

without changing the tonal quality of your program. (Important

note: Set up only one channel at a time. Do not attempt to ring

out both channels of your sound system for feedback simul-

taneously.)

11. Place the speakers and microphones in the positions

where they will be used during the program. Avoid placing

microphones directly in front of speakers.

12. Place both FBX channels in BYPASS mode.

13. Set the mixer's master volume controls to their lowest

positions. Turn on the mixer, then the FBX, 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.

14. Press RESET for 3 LED flashes to clear dynamic filters, and

an additional 4 flashes to clear ALL filters set previously.

5. OPTIONAL: Set the total number of FBX filters. (Factory

default is 12 filters per channel - skip to #7

if default is OK for your application) You

can limit the number of available FBX fil-

ters. Hold down the SET TOTAL NO.

button for 4 seconds. The LEDs will flash

4 times. 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. OPTIONAL: Set the number of Fixed filters (Factory default

is 9 fixed and 3 dynamic per channel - skip to #7 if default is

OK for your application). Depress the SET FIXED button for

4 seconds. The filters LEDs will flash 4 times and then 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.

IMPORTANT TIP:

You can mix 1/10- and 1/5-

octave filters in the same

channel. If you have an espe-

cially bad feedback problem,

try making the first few filters

1/5-octave and the remain-

ing filters 1/10-octave.

1 2 3 4 5 6 7 8 9 10 11 12

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SABINE FBX-2020 Operations Instructions Page 8

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