SABINE FBX2420 Spécifications télécharger pdf (Page 6)

SECTION FIVE — HOW TO USE FBX FEATURES

5.1. Input / Output Level Switches

Use the two-position switches on the back panel of your FBX1220 / FBX2420 to compensate for input level or output level

requirements. NOTE: For unity gain (recommended), set the channel's input & output level switches to the same setting.

5.1.1. Setting Levels: Set both Input & Output switches the same for Unity

Gain

5.2. FBX Filter Control

5.2.1. Selecting Filter Width

If you’re using the FBX for a music application, the standard 1/10-octave constant “Q” lter is most effective. However, in spo-

ken word applications, such as lectures or teleconferencing, we recommend using the wider 1/5-octave lter for more robust

feedback control. You may enable the 1/5-octave lters by pressing the FIFTH OCTAVE button, and the built-in LED will light.

Only lters set after pressing the button in will be 1/5-octave. Press the button again to set subsequent lters to standard

1/10-octave lters. You can mix lter widths: start with a few lters at 1/5 for the worst feedback points, then switch to 1/10.

5.2.2. Setting Number of Fixed vs. Dynamic Filters

To change the number of Fixed lters from the factory default of 9 Fixed and 3 Dynamic per channel, push the READY button

for 4 seconds. The lters LEDs will ash 4 times and then go out. Release the READY button, and the LEDs will begin to light

in sequence. When the LED corresponding to the desired number of Fixed lters lights, press the READY button again.

IMPORTANT TIP: You can mix 1/10- and 1/5-octave lters in the same channel. If you have an especially bad feedback prob-

lem, try making the rst few lters 1/5-octave lters.

5.2.3. Resetting FBX Filters

AllFBXlters: To reset all FBX lters, follow the directions in Section 4.2.

DynamicFBXltersonly: To reset only Dynamic lters, press RESET DY-

NAMICS until the current Dynamic lter LEDs ash and then turn off. Release

the button.

5.2.4. Dynamic Filter Timer

The Dynamic Filter Timer, when enabled, automatically resets Dynamic lters after a user-selected time has passed (refer to

Timer Settings chart at right).

5.2.4.1. Set the Dynamic Filter Timer

1. Press and hold the RESET DYNAMICS button. The Dynamic LEDs ash twice and reset. Continue holding the

button and the current Dynamic Filter Timer setting will ash twice (lter LEDs 1-5, see

Filter Timer Chart at right).

2. Release the RESET DYNAMICS

button and lter LEDs 1-5 will

cycle through the possible timer

settings.

3. Press RESET DYNAMICS again

at the desired timer setting. LEDs will ash twice (including lter LEDs

indicating the current timer setting). Your Dynamic Filter Timer is now set. The timer starts

individually for each Dynamic lter.

5.3. Important Operating Considerations

5.3.1. Power-Off Memory

The FBX stores the positions and depths of the lters in nonvolatile internal memory when the unit is turned off or during a

power failure. The unit will return all lters to their previous frequencies and depths when it is turned back on.

5.3.2. Bypass Mode

The FBX has a true power-off bypass. The signal is unaffected in Bypass mode even if the unit is turned off. Note that if a com-

bination of balanced and unbalanced inputs and outputs is used, the signal may be disconnected or attenuated in Bypass.

5.3.3. Setup Mode

NOTE:Setupmodeisforpre-performanceaudiosetuponly,andwillcausedistortioninyouraudioprogramiflefton

duringperformance.You must follow the setup procedure outlined in the previous section, and do not play program or talk

into the mics during Setup. Otherwise the FBX will clip and lters may be set improperly (Clip level is set to the lowest level

OUT

Accepts low level input up to +6 dBU

Accepts high level input up to +24 dBU

Outputs at low level, for sending signal to low-level devices or some insert

points. See Section 2 for more information on applications.

Outputs at high level, for most line-level devices. See Section 2 for more

information on applications.

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