SABINE FBX-2020 Instrucciones de operaciones descargar pdf (Pagina 9)

Resetting the filters:

You must reset the FBX if the microphones or speakers are moved

significantly. To reset the unit, place the PA system’s master

volume to minimum and then press the reset button until all the

FILTER LEDs stop flashing. Then follow the system initialization

procedure explained previously. Or you can reset only the

Dynamic filters by pressing and releasing the reset button after the

Dynamic filter LEDs stop flashing. This may be useful in certain

situations, for example, after extensive wireless microphone use.

TURBO MODE SETUP

The FBX-2020Plus incorporates TURBO mode setup, which is

indicated by a flashing red “CLIP” LED. This lightning-quick setup

feature cuts the time for FBX filter initialization to just a few seconds,

and it reduces the volume level of the feedback during setup. The

2020Plus is set in TURBO mode at the factory and automatically

engages every time you press RESET (resetting filters). The

2020Plus automatically returns to normal program mode when

the first dynamic filter is set or when you press the front panel

LOCK FIXED button.

ALL FILTER LEDS WILL CYCLE TO

INDICATE THE FBX IS ABOUT TO EXIT TURBO MODE.

WARNING: TURBO Mode will cause distortion in your audio

program — it is for setup only. You must follow the setup

procedure outlined in the previous section, and do not play program

during TURBO setup mode. Otherwise the 2020Plus will clip, and

filters may be set 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.)

You’ll know the 2020Plus is in TURBO mode if the red CLIP LED

flashes when no other signal level LEDs are lit.

You can manually override TURBO mode if necessary: Press LOCK

FIXED (the LOCK FIXED light will turn on), then press it again.

(LOCK FIXED light will go out).

MOBILE vs. STATIONARY MICROPHONES

One significant advantage offered by the Sabine family of FBX

feedback eliminator products is their ability to adapt to changing

acoustical relationships involving sound system components and

various user applications. One major source of potential feedback

problems arises in situations with wireless microphones, when the

user of the wireless mic is moving around the stage/auditorium. As

a microphone moves in a sound space, with varying degrees of

proximity to the speakers and varying acoustic responses, feedback

frequencies may shift. In such a situation, feedback-free mobility

may be more important a concern than maximum system gain.

One method of setting FBX filters with mobile microphones is to turn

a microphone on and walk around to the various possible micro-

phone locations. At the same time, raise the system gain and set the

FBX filters one at a time.

In some situations, raising the number of dynamic filters (versus

fixed FBX filters) may allow a second layer of defense against new

feedback from new locations. However, in many mobile microphone

set ups, fixed FBX filters will protect against feedback across the

range of microphone mobility.

Q. Can I place the FBX in the mixer’s EQ loop?

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 disconnected

from the back of the unit.

Q. Can I mix balanced and unbalanced inputs and outputs?

A. Yes. An unbalanced input and balanced output is compatible.

However, a balanced input and unbalanced output may result in

a 6 dB loss of dynamic range, and the bypass function may not

operate correctly.

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 set-up, 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.

Q. Why does the FBX cause a noticeable hum?

A. It hums if the main power voltage drops significantly below 10%

of the specified voltage. Check the A/C power mains.

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, reinitialize the system.

Q. Why does my program sound clipped and distorted?

A. Make sure the FBX’s TURBO mode has turned off before your

program. Check the signal level ladder. If the red CLIP LED lights

with no other signal level LEDs lit, the FBX-2020Plus is still in

TURBO mode. TURBO mode turns off automatically after the

first dynamic filter is set, or you can turn it off manually by pressing

the LOCK FIXED button.

Q. Can I patch two FBX-2020Plus channels together for twice the

filters?

A. Yes; connect the output of the FBX2020Plus’s channel A to the

input of the 2020Plus’s channel B. Place the 2020Plus between

the output of the mixer and the input of a power amp, and set up

the channels sequentially. 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 LOCK FIXED button on

the front panel after set-up.

Q. Why doesn't the FBX-2020Plus filter feedback immediately?

A. 1. Lower frequencies may take longer than

higher ones.

2. Check input level of signal at the unit and reconfigure 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 continue

to operate by notching feedback frequencies as they occur, but

ultimately, gain will exceed filter capacity.

TROUBLESHOOTING TIPS

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SABINE FBX-2020 Instrucciones de operaciones Pagina 9

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