SABINE FBX2420 Spécifications télécharger pdf (Page 7)

LIT-FBX1220-1224-OP-EN-080208.pmd - ks

SECTION SIX — TROUBLESHOOTING TIPS

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rstdynamiclterisset,oryoucan

turnitoffmanuallybypressingtheREADYbutton.SeeSec-

tion5.3.3.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.Patch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

FBX2420,setallchannelAltersfoxed(seesection5.2.2)

andbypasschannelB.Follownormalsetupprocedureon

channelA,andlockthexedlters(seesection4.2).Then

followthestandardsetupprocedurechannelB,whichshould

haveafewdynamicltersavailable.

Q. Why doesn't the FBX1220 & FBX2420 Series ﬁlter feed-

back 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lters.Dynamiclterswillcon-

tinuetooperatebynotchingfeedbackfrequenciesasthey

occur,butultimately,gainwillexceedltercapacity.

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conguration.Youcancongure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 out-

puts?

A. Yes.Anunbalancedinputandbalancedoutputiscompat-

ible.

Q. Why does one of the FILTER ACTIVITY LEDs blink?

A. Thelast lter to be automatically updated blinks. During

normaloperation,theblinkingwillmovefromltertolteras

theyarereset.Thisgivestheuseravisualconrmation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lterifthesystemhasahum.Checkfor

badgrounds.TryresettingthelterswiththeunitinBypass.

IfthevenueisnoisypresstheReadybuttononcebefore

takingtheunitoutofBypass.ThentakeitoutofBypassand

proceedwiththenormalinitiationprocedure.

so the feedback clips quickly; therefore, your program will also be clipped in setup mode). Be sure the blue Ready light is

on (either ashing or steady) and if it isn’t, press the READY button before your program begins. You’llknowtheFBX1220

/FBX2420isinsetupmodewhentheSETUPbuttonislit.NOTE: You can manually override Setup mode if necessary.

That's right -- press the Ready button!

5.3.4. Mobile vs. Stationary Microphones

One signicant advantage offered by the Sabine family of FBX Feedback Exterminator products is their ability to adapt to

changing acoustical relationships involving sound system components in various 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

performance area. 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.

For this reason we recommend setting FBX lters for mobile microphones by moving to the various possible microphone

locations and setting lters for those locations. As the Setup instructions show, raise the system gain and set the FBX lters

in each predictable location.

In some situations, increasing the number of dynamic lters (versus xed FBX lters) may allow a second layer of defense

against new feedback from new locations. This technique is recommended if you cannot predict where the performer may roam.

But xed FBX lters placed in the setup procedure are still your best bet because the feedback lters are already set.

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SABINE FBX2420 Spécifications Page 7

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