SABINE FBX1220 User manual

Op e r a t i n g
Quick Start Setup on back page
CONTENTS
SECTION ONE — FrONT & BaCk PaNElS 2
1.1. FBX2420 Front Panel Controls & LED Indicators 2
1.2. FBX2420 Back Panel Controls & Connections 2
SECTION TwO — aPPlICaTIONS 3
2.1. FBX Setup for Monitors 3
2.2. FBX Setup for Entire Mix 3
2.3. FBX Setup for Single Insert Point 3
2.4. FBX Setup for Insert Send & Return 3
SECTION THrEE — ENGINEErING SPECIFICaTIONS 3
SECTION FOUr — OPEraTING INSTrUCTIONS 4
4.1. Before You Begin 4
4.2. How To Operate your FBX1220 / FBX2420 5
SECTION FIVE — HOw TO USE FBX FEaTUrES 6
5.1. Input / Output Level Switches 6
5.2. FBX Filter Control 6
5.3. Important Operating Considerations 6
SECTION SIX — TrOUBlESHOOTING TIPS 7
SECTION SEVEN — FBX THEOry & PraCTICE 8
7.1. Introduction to FBX 8
7.2. The Advantages of FBX Filters 8
7.3. Parametric Filters and FBX 9
7.4. Who Benefits from FBX? 9
SECTION EIGHT — CaUTIONS & warraNTy 10
with
SMARTFILTERS

2
1. SETUP
Press and hold this button to begin the FBX setup mode. Filter
LEDs (light emitting diodes) will ash 5 times and the SETUP
LED will begin to ash. You are now ready to set FBX lters.
2. READY
The READY LED lights when the automatic FBX setup process
has completed, or the READY button has been pressed. This
indicates your unit is ready for operation. The total number of
lters available for feedback ltering is 12; in the factory default
setting, your unit will automatically enter READY mode when
the tenth lter is set. Alternatively, you may enter READY status
with fewer Fixed FBX lters in place, simply by pressing the
READY button at any time. Press READY again to lock the
Fixed lters.
3. BYPASS
Bypass mode takes the unit out of the signal path so that it will
have no effect on the program. In active mode, the unit controls
feedback automatically. The red BYPASS LED lights when the
unit is in bypass mode.
4. SIGNAL LEVEL
The LED ladder indicates the signal strength relative to the
FBX's input clip level.
SECTION ONE — FRONT & BACK PANELS
1.1. FBX2420 Front Panel Controls & LED Indicators
9. A/C Power Input
The FBX1220 & FBX2420 Series is factory congured to
operate at 230 VAC. Using the wrong input voltage may cause
permanent damage to the unit and will void the warranty.
10. Fuse
This equipment is tted with an IEC power inlet incorporating a
built-in fuse holder. To change the fuses in this socket:
1. Disconnect the power cord from the unit.
2. Pull out the fuse holder and remove the old fuse.
3. Install a new fuse into the holder. Replace only with one
of the following fuses:
• 230 VAC: 0.1 A, 10 W, 0.160 A SB fuse
4. Ret the fuse cover.
11. Power Switch
Previous settings retained during power-off.
12. Quarter-inch Output
TRS balanced or TS Unbalanced output .
13. Input/Output Level Switches
Set to match your desired Input/Output level congurations.
For unity gain set both switches to the same postion.
14. XLR Output
XLR balanced output.
15. Quarter-inch Input
TRS balanced or TS unbalanced input.
16. XLR Input
XLR balanced input.
1.2. FBX2420 Back Panel Controls & Connections
5. RESET DYNAMICS & DYNAMIC FILTER TIMER
Press and hold this button until the Dynamic lter ash and
LEDs go off to reset all Dynamic lters. See Section 5.2.4. for
enabling and setting the Dynamic Filter Timer.
6. NUMBER FIXED
Set the number of available xed lters by pressing the NUM-
BER FIXED button (6) until the LEDs stop ashing, then release
it. The LEDs (8) will begin to light in sequence. When the LED
corresponding to the desired number of xed lters lights, press
the Number Fixed button to register your selection.
7. FIFTH OCTAVE
Press the button at any time to select wider lters for any new
lters to be set. It is possible to have both 1/5 and 1/10 octave
constant "Q" lters active in one channel simultaneously.
8. FILTER STAGE ACTIVITY
When one of the unit’s lters is activated, the corresponding
LED lights. A blinking LED
indicates the lter that was
most recently activated.
842
1 3 5 7
6
12 14 12 14
13 13
151615 1610119
13 13
Note: FBX1220 front and back panels
use the same controls and
input/output conguration

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SECTION TWO — APPLICATIONS
2.2. FBX Setup for Entire Mix
2.1. FBX Setup for Monitors
2.3. FBX Setup for Single Insert Point
2.4. FBX Setup for Insert Send & Return
Right Main Send
Left Main Send Ch. B
IN
Ch. A
IN
All other Signal
Processing
Ch. B
OUT
Ch. A
OUT
FILTERS
• 12 independent digital notch
ltersperchannel, controlled au-
tomatically from 40 Hz to 20 KHz.
• Filterwidth: user-controllable - either
1/10 or 1/5 octave*, constant "Q"
• Resolution: 1 Hz
• Timerequiredtondandeliminate
feedback: 0.4 seconds, typical @ 1
KHz
• Number of Dynamic vs. Fixed
lters per channel: user select-
able. Last conguration stored in
memory.
INPUT/OUTPUT**
• Input/Output Maximum Signal
Levels: Balanced +27dBV peak,
unbalanced +21 dBV peak
• Output Drive: Unit will perform
as specied driving a load >600
Ohms
• InputImpedance: Balanced or un-
balanced >40K Ohms, PIN 2 high
• Output Impedance: Balanced or
unbalanced 150 Ohms nominal, PIN
2 high
• Bypass: True power off bypass
• Headroom: +23 dB peak @ 4 dBV
nominal input, balanced
• I/OConnectors: XLR-3 and 1/4"
TRS
PERFORMANCE***
• Frequencyresponse: 20 Hz – 20
KHz +/- 0.3 dB
• Gainmatching: +/- 0.2 dB
• SpectralVariation: + .25 dB, 20
Hz to 20 KHz
• SNR-DynamicRange: >100 dB
• THD: .005% at 1 KHz
< 0.01% 20 Hz – 10 KHz
< 0.025% 10 KHz – 20 KHz
• DynamicRange: >105 dB
POWER INPUT
• 230 VAC: 200 – 240 VAC 50/60
Hz
FUSE
• 230 VAC, 0.1 A, 10 W, 0.160 A SB
fuse
DIMENSIONS
• 1-U rack mount; 19 x 1.75 x 6.25 in.
nominal (rack mountable); 48.3 x 4.5
x 15.9 cm nominal
WEIGHT
• 8.0 lbs. (3.6 kg) nominal
SECTION THREE — ENGINEERING SPECIFICATIONS
TS or TRS Connectors
Ch. B OUT
Ch. A OUT
Ch. B IN
Ch. A IN
TS or TRS Connectors
Ch. 2
<> Insert
Send
Insert
Return
Ch. 1
<> Insert
Send
Insert
Return
< Low Z >
< High Z >
< Insert >
Ch. 1 Ch. 2
TRS Connector
TRS Connector Y Insert Cords (TRS to TS + TS)
Ch. B OUT Ch. B IN Ch. A IN
TS "Y" Connector
Ch. A OUT
TS "Y" Connector
Monitor Mix 1
Monitor Mix 2 Ch. B
IN
Ch. A
IN
Ch. B
OUT
Ch. A
OUT
Tests performed using an Audio Precision
System One model 322 or equal.
*Below approximately 200 Hz the feedback lters
become slightly wider to increase the feedback and
rumble capture speed at these low frequencies.
IMPORTANT NOTE
• Mixingbalanced and unbal-
ancedconnectionsmayresult
ina6dBlossofgain.
IMPORTANT NOTE
• Usea ¼-inchTRS plug for
balancedsends/inserts.
• Use a ¼-inchTS plug for
unbalancedsends/inserts.
• Mixingbalanced and unbal-
ancedconnectionsmayresult
ina6dBlossofgain.Refer to
section 5.2.
IMPORTANT NOTE
• Usea ¼-inchTRS plug for
balancedsends/inserts.
• Use a ¼-inchTS plug for
unbalancedsends/inserts.
• Mixingbalanced and unbal-
ancedconnectionsmayresult
ina6dBlossofgain.

4
4.1. Before You Begin
These instructions apply to both the FBX1220 and the FBX2420. The 2420 is a
dual-mono version of the 1220. Your FBX Feedback Exterminator will improve any
sound reinforcement system. The instructions presume that you are familiar with the
fundamentals of sound reinforcement.
4.1.1. Where the FBX fits in your sound system:
The most common patch point is between the output of the mixer and the input of a
power amp. In this position, the FBX can sense and eliminate feedback occurring
in any channel of the mixer. An even better solution is on a mixer insert point for
a single channel, or a subgroup (see application diagrams in Section Two — Ap-
plications). This targets the feedback control to the mics that need it.
Note: If you’re using a mixer with unbalanced 1/4" outputs, you must use standard
unbalanced cables and connectors when connecting it to the FBX. Similarly, if your
mixer is wired for balanced 1/4" Tip-Ring-Sleeve (TRS) outputs, you must use that
type of connector. If you don’t, you may experience a loss of gain (up to 6 dB) when
using the FBX. This can occur if either side of the balanced output is grounded at
any point (or when mixing balanced and unbalanced inputs and outputs).
4.1.2. A note about graphic equalizers:
The FBX is designed to replace the graphic equalizer’s function for eliminating
feedback. In many applications, such as churches, auditoriums or small acoustic
ensembles, the mixing board provides all the tonal control that is necessary. The
FBX can replace the graphic EQ altogether in some applications; however, a
graphic equalizer may be benecial to shape a system's total performance. If you
do want to use an equalizer, place the FBX after the EQ in the signal path. Use
the EQ’s controls to shape the tonal response of the sound system, but DO NOT
NOTCH FOR FEEDBACK.
4.1.3. Understanding FIXED and DYNAMIC filters
Before operating the FBX, you need to understand the two types of FBX lters:
FIXED and DYNAMIC. FIXED FILTERS retain their frequency center-points until
the unit is reset by the user. The system’s gain before feedback is limited primarily
by the number of xed lters; i.e., increasing the number of xed lters increases
the system’s gain before feedback. In addition, you can LOCK the xed lters so
they do not get any deeper. Locked xed lters are no longer adaptive. The FBX's
DYNAMIC FILTERS control intermittent feedback that comes and goes throughout
the program. They are continually reset automatically to different frequencies as new
feedback occurs during the program.Formostapplications,theoptimalsetting
isnineFIXEDandthreeDYNAMICFILTERS.Thisisthefactorydefault.
4.1.4. Setup & Ready
Your FBX Feedback Exterminator is either in Setup, Ready, or Bypass mode.
SetupMode:It’s quick and quiet, but use this mode for setup only – do not use
the FBX for your program while in Setup mode. Think of Setup mode as your
key to achieving one of the main benets of the FBX: getting more gain before
feedback. In Setup mode you will be raising the gain of your system so the FBX
can place transparent lters (Fixed Filters) that will allow you to get all the gain
you need for a loud and clear show. In Setup the FBX is very sensitive so donot
talkintothemicsduringsetup, and try to keep room noise to a minimum. If the
room is noisy, then go into Ready mode and raise your gain while the xed lters
are still unlocked (ashing Ready LED).
ReadyMode:  Let the show begin. Your xed lters are eliminating feedback
and giving you extra gain, and your dynamic lters are ready to jump on any new
feedback during the show. In this mode your xed lters are either locked (red
LEDs) or unlocked (amber LEDs). We recommend locking your xed lters for
the show. But if you don’t have time for the Setup mode, or if the room is just too
noisy during setup, then you can start off by unlocking the xed lters. Leaving
the xed lters unlocked allows them to get deeper if needed, which can be handy
if you need to get more gain before feedback. But once your system stabilizes we
recommend you lock the xed lters for the duration of the show!
SECTION FOUR — OPERATING INSTRUCTIONS

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4.2. How To Operate your FBX1220 / FBX2420
Placeequipment&makeconnections.
a. Patch your FBX1220 or FBX2420 into system and make all connec-
tions (refer to pages 2 and 3 for connection options).
b. Place speakers and microphones in performance positions.
c. Set Input and Output levels on FBX back panel (see Section 5.1.1.
for details). Start with all buttons pushed in.
d. If you are using a graphic EQ, adjust only for the desired tonal quali-
ties, but DO NOT NOTCH FOR FEEDBACK.
e. Adjust the level for each mixer channel, and set the sound system’s
master volume to minimum.
Push SETUP button until all LEDs stop ashing and the
SETUP light ashes on its own. Setup mode clears all Fixed &
Dynamic lters. Do not use Setup mode during your performance.
Slowlyraisethe gain on the mixer or amp until the FBX
eliminatestherstfewfeedbacktones.
DO NOT TALK INTO THE MICS. The FBX will quickly begin to nd and remove
feedback. The rst Fixed lter set will be heard as a quiet feedback chirp and
shown as an amber LED. As you slowly raise the gain, more feedback chirps
will be heard, and more amber LEDs will light.
a.Ifyouareusingstationarymicrophones:
Continueraising the gainuntil all lter LEDscycle back andforth in
sequence. This is your indication that the FBX is exiting setup mode.
IMPORTANT: Reduce gain slightly. You are now in READY (perfor-
mance) mode, with the Fixed lters locked and the blue Ready light
on. Begin the show!
b.Ifyouareusingwirelessmicrophones:
You can get more gain in a variety of locations. To do this, lower the system
gain after the rst few lters are set, then move the microphone to another area
where it will be used and raise the gain slowly as before. Repeat this process
while you continueraisingthegainuntilalllterLEDscyclebackandforth
insequence. This is your indication that the FBX is exiting setup mode.
IMPORTANT: Reduce gain slightly. You are now in READY (perfor-
mance) mode, with the Fixed lters locked and the blue Ready light
on. Begin the show!
c.YoumayquitSetupmodeatanytime prior to its automatic exit by simply
pressing the READY button (blue READY LED will ash). Press it again at
any time to lock the Fixed lters (blue READY LED stays on). Whether locked
or unlocked, pressing the READY button before Setup mode automatically
nishes will enable ready-to-operate status, but with fewer xed FBX lters
in place. Dynamic FBX lters are still available to eliminate new feedback,
regardless of how or when SETUP mode is exited. Begin the show!
IfyoudonothavetimetouseSetupMode:
Push the READY button -- the blue LED ashes indicating the xed lters are
unlocked. Begin your show, and once several xed lters are set we recom-
mend you lock them by pushing ready again (blue LED stays lit). You won't
get all the potential benet of increased gain before feedback, but you will get
automatic feedback control during your performance.
1
3
2
Followtheseprocedurestogetmaximumgainbeforefeedback
Fixed&DynamicFilters
Front panel lter LEDs
lighting as gain is raised
and Fixed lters are set.
a. Set up one FBX channel at a
time.
b. DO NOT TALK INTO YOUR SYS-
TEM while in Setup mode.
c. See Section 5.2. FBX Filter Con-
trol for information on:
• Changing the number of Fixed
vs. Dynamic lters
• Selecting and mixing 1/10- &
1/5-octave lters
• Enabling and setting the Dy-
Power Tips
See Section 4.1.3. for details on
the differences between Fixed and
Dynamic FBX lters, and Section
5.2.2. for instructions on changing
the balance of Fixed versus Dy-
namic lters.
4
Fixed, Locked RED Steady BLUE
Fixed, Unlocked AMBER Flashing
BLUE
FILTER COLOR KEY
FBX Filters LEDs Ready LED

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
atthe desired timersetting. 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
IN
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.
p O s i t i O n O u t p u t l e v e l s w i t c h e si n p u t l e v e l s w i t c h e s

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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.

8
SECTION SEVEN — FBX THEORY & PRACTICE
7.1. Introduction to FBX®
WHY FBX? Feedback is certainly the most pervasive challenge to the audio industry. The
potential appearance of sudden, loud, out-of-control feedback is every sound engineer’s
and musician’s nightmare. Unlike more subtle audio quality problems or shortcomings,
feedback is embarrassingly obvious — it disturbs the performer, the audience, and the
technician, and can damage equipment and just generally ruin your day.
Feedback is a potential problem in any amplied sound system that places a microphone
or pickup in proximity to a loudspeaker. Poor acoustical conditions or misguided use by
unsophisticated sound system operators only aggravate the situation. To make matters still
worse, a non-Sabine variety of wireless microphone adds yet another level of feedback
danger to the picture. Since feedback erupts whenever the distance, location, and gain
relationships between a speaker and a microphone reach a critical combination, a mic
that can move anywhere results in an ever changing potential for feedback. A step in the
wrong direction may change a clear sound to a piercing shriek in less than a second.
This enhanced potential for feedback with a wireless system gets worse if lavalier mi-
crophones are used. Such microphones are usually placed farther from the mouth than
handheld or head set microphones, thus requiring more gain. Also, the polar pattern
of a lavalier microphone is frequently omnidirectional. Thus, the likelihood of feedback
increases, due to the microphone’s increased off-axis sensitivity to the sound emanating
from the loudspeakers.
The Sabine FBX1220 and FBX2420 systems solve feedback problems by precise attenu-
ation of very narrow bands of feedback-prone frequencies. The process is automatic,
simple to use, adaptable to changing acoustical conditions and relationships, powerful in
its application, and has minimal consequences to the audio delity of the signal. We call
this automatic lter an FBX Feedback Exterminator® lter, or FBX lter for short.
7.2. The Advantages of FBX Filters
Before the invention of FBX, the most common device for controlling feedback was the
31-band graphic EQ. However, an FBX lter offers three distinct advantages over graphic
lters.
1. FirstandmostobviousistheautomaticnatureofFBXlters.Whenfeedbackoccurs,
FBXrespondsmorequicklythan even the most experiencedengineer. Automatic
FBXplacementworkseveninthepresenceofaudioprogrammaterial,intelligently
distinguishingfeedbackfrommusicorspeech.
2. AsecondadvantageisthatFBXmicro-ltersarepreciselyplacedanywherefeedback
occurs(with1Hzresolution),whilegraphicEQltersarelimitedto31xedcenter
points.AnFBXlterrepresentsadirecthitonfeedback!Incontrast,agraphicEQ
ltercanonlyapproximatetheexactfrequencyofthefeedback,andthelter(orlters)
withtheclosestcenterfrequencymustbepulleddown.Suchltersaredeepestat
theircenters,andsuchimpreciseattenuationtakesabig(andunnecessary)chunk
outofyoursound(seegure7a).
3. Increasedclarityandgain-before-feedbackarefurtheraccomplishedbythethirdand
mostimportantadvantageofFBX:Sabine’smicro-ltersaretentimesnarrowerthan
31-bandEQlters.UsingFBXmicro-lterswillreturnupto90percentofthepower
removedbyEQlters.
Here’s a good place to make a very important distinction. Graphic EQ lters are typically
called “1/3-octave,” but it’s important to understand that this term refers to the spacing of
the lter centers (1/3-octave apart), and not the width of the lter (usually a full octave).
Graphic lters thus overlap one another, and affect frequencies well above and below
the center point frequency, including frequencies of adjacent bands. This makes graphic
equalizers very practical tools for shaping sound “with broad strokes,” such as dialing in
overall system EQ, but results in destructive audio quality overkill when they are used
to eliminate feedback. A graphic equalizer would need more than 10,000 narrow-band
sliders to be as precise and powerful as your FBX.
As an example of the power of FBX, gure 7b shows test results measured with a PA set
up consisting of a microphone, mixer, FBX Feedback Exterminator®, power amp and two
speakers. The system’s gain was rst raised until the FBX removed nine feedback points.
Next, the FBX was replaced with a graphic EQ. The EQ was adjusted while the system
gain was raised to the same level achieved with the FBX. The frequency response curves
of each device were then plotted and are compared in gure 7b. Note how much more
of the program (the “good audio”) is eliminated using an EQ — whereas only feedback
is eliminated using FBX lters.
7.3. Parametric Filters and FBX
If the graphic EQ really had 1/3 octave
filter widths, the frequency response curve
would vary 6 dB between sliders. This
would ruin the sound.
Graphic EQs usually use one-octave-
wide overlapping filters that provide much
smoother frequency response curves.
Notice that the overlapping filters add
together to cut -16 dB when the sliders
are only pulled down -10 dB.
-10 dB cut at 500, 630, 1K, 1.25K, 1.6K & 2K Hz
Fig. 7a.

LIT-FBX1220-1224-OP-EN-080208.pmd - ks 9
© 2008 Sabine, Inc.
Of course, many savvy sound engineers, realizing the limitations of
graphic equalizers in removing problem feedback, prefer to use a
different type of equalizer, called a parametric EQ, for such applica-
tions. If you’re one such audio engineer, you’ll be comforted to know
that FBX lters share much in common with parametrics.
Compared to graphic lters, parametrics allow more precise adjust-
ments — specically, control of lter width, the amount of boost or
cut, and the mid-band frequency of the lter. This greater precision,
however, comes at a price, as parametric lters are not nearly as
intuitive or simple to use as graphic equalizers.
Nothing, however, is easier to use than an FBX lter, which enjoys
the precision of a parametric lter, yet deploys instantly and auto-
matically whenever feedback is detected. Effectively, an FBX lter is
a parametric lter set to a tenth-octave width, restricted to cut-only
activity, and automatic in its choice of frequency band.
7.3.1. Dynamic FBX Filters
Dynamic FBX lters also set automatically, but can change frequency, on a rotating basis,
as the need arises. To help distinguish dynamic from xed lters, consider the example
of a speaker using a wireless lavalier microphone, who walks under a ceiling speaker for
the rst time. In so doing, he enters a location-specic feedback zone, where it’s possible
that a problem frequency may have escaped detection and notching by a xed lter. If
all xed lters have been deployed, a dynamic lter will be set automatically as soon as
feedback appears, solving the problem. Great! But what happens when the speaker then
moves away from the ceiling speaker, and close to a oor monitor? Feedback from the
ceiling speaker is no longer a problem, but a new frequency starts to squeal. If all xed
and dynamic FBX lters are already set, a dynamic lter will change, to adjust to the new
location. An FBX dynamic lter thus stands guard if new problem feedback arises after
all available lters have been set, providing a deeper and more exible level of protection
against the dreaded surprise of feedback. Other than the ability to change frequency, a
dynamic lter is equivalent to a xed lter.
7.3.2. Balancing Fixed & Dynamic Filters
Your FBX1220, and each channel of your FBX2420, offer a total of 12 FBX lters (com-
bined xed and dynamic), which can be used as needed to exterminate feedback. After
years of experience and experimentation, Sabine has settled upon a default balance of
9 xed and 3 dynamic lters, set at the factory. This default condition can be changed to
any combination you require.
If you follow setup instructions for setting FBX lters, your FBX1220/FBX2420 will automati-
cally exit SETUP mode (enter READY status) after all xed lters and the rst dynamic
lter are set. In the default condition, this means you will have set ten lters (nine xed
and one dynamic), with two dynamic lters not set and ready to catch new feedback. If
you wish to set fewer lters, press the READY button before SETUP automatically exits,
after you have set enough lters to safely achieve your desired gain level. In that case, in
the factory default condition, you will have three dynamic lters plus the remaining unused
(and unlocked) xed lters available to catch new feedback.
7.3.3. FBX Filter Width
Sabine’s experience and testing with lters and sound quality led us to decide upon a
default FBX lter width of .10 (one-tenth) octave as the optimal notch width. This elimi-
nates feedback very well without affecting music programs. If, with all lters properly set,
feedback is still a problem, FBX lters may be set to .20 (one-fth) octave width. This
wider lter setting will potentially control more feedback frequencies, especially when they
are clustered, but this wider lter may also affect music programs slightly. For this reason
the wider setting is generally considered to be appropriate where speech (less demanding
than music) is the primary application. You can change FBX lter widths by pressing the
FIFTH OCTAVE button on the front panel. Note that the width of any lter will always be
determined by the position of the switch at the time the lter is created.
7.4. Who Benefits from FBX?
Virtually every sound system will be improved with the Sabine feedback control. Singers
and presenters who do not have sound technicians can now increase their monitor or house
system volume so they can hear themselves clearly and with full delity, without worrying if
their microphones will suddenly squeal if they move to the wrong place.
Auditoriums and churches of all sizes will enjoy reliable feedback control. Hotels and confer-
ence centers around the world can offer meeting rooms with microphones that won’t howl
during programs. Sabine FBX systems can be installed in theaters, schools, sports arenas,
courtrooms, teleconferencing rooms, intercoms or interactive remote classrooms — anywhere
one or multiple microphones are used.

10
Warning!Thisequipmentmustbeearthed.
Caution!Riskofelectricshock.Donotopen.
Caution!Shockhazard.Donotremovecovers.Nouserserviceable
partsinside.Referservicingtoqualiedservicepersonnel.
Warning!Toreducetheriskofreorelectricshock,donotexposethis
producttorainormoisture.
Attention!Cetappareildoitêtrereliéàlaterre.
Attention!Risquedechocélectrique;nepasouvrir.
Attention!Risquedechoc;nepasoterlescapots.Aucunepièceacces-
sibleàl'intérieur.S'addresseràuntechnicienqualié.
Attention!Pourréduirelerisqued'incendieoudechocélectrique,ne
paslaisserl'appareilsouslaplouieouàl'humidité.
Achtung!DiesesGerätmussschutzgeerdetsein.
Achtung!GefareineselektrischenStormschlags.Gehausenichtöffnen.
Achtung!GefareineselektrischenStormschlags.Gehäusenichtöffnen.
KeineconBenutzerzubedienendenTeileimGeräteinneren.
ÜberlassenSiedasGerätzuServicezweckennurgeschultemFachper-
sonal.
UmBrandgefaroderdasRisikoeineselektrischenSchlags
auszuschließen,dasGerätvorNässeundFeuchtigkeitschützen.
Advertencia!Esteequipodebeestarconectadoatierra.
Precaución!Reisgodedescargaeléctrica.Noabrir.
Precaución!Riesgodedescargaeléctrica.Nodesmontarlastapas.
Piezasinterioresnoreparablesporelusuario.Reparablesólopor
personalcualicado.
Advertencia!Parareducirelriesgodeincendioodedescargaeléctrica
noexpongaesteproductoalalluviaohumedad.
FCC Statement:
ThisdevicecomplieswithPart15oftheFCCRules.Operationissubject
tothefollowingconditions:(1)Thisdevicemaynotcauseharmfulinterfer-
ence;and(2)Thisdevicemustacceptanyinterferencereceived,including
interferencethatmaycauseundesiredoperation.Warning: Changesor
modicationstothisunitnotexpresslyapprovedbythepartyresponsible
forcompliancecouldvoidtheuser'sauthoritytooperatetheequipment.
NOTE:This equipment hasbeen testedand found tocomply with the
limitsforaClassBdigitaldevice,pursuanttoPart15oftheFCCRules.
Theselimitsaredesignedtoprovidereasonableprotectionagainstharmful
interferenceinaresidentialinstallation.Thisequipmentgenerates,uses,
andcanradiateradiofrequencyenergyand,ifnotinstalledandusedin
accordancewiththeinstructions,maycauseharmfulinterferencetoradio
communications.However,thereisnoguaranteethatinterferencewillnot
occurinaparticularinstallation.Ifthisequipmentdoescauseharmful
interferencetoradioortelevisionreception,whichcanbedeterminedby
turningtheequipmentoffandon,theuserisencouragedtotrytocorrect
theinterferencebyoneormoreofthefollowingmeasures:
 •Reorientorrelocatethereceivingantenna.
 •Increasetheseparationbetweentheequipmentandreceiver.
 •Connecttheequipmentintoanoutletonacircuitdifferent 
fromthattowhichthereceiverisconnected.
 •ConsultthedealeroranexperiencedradioTVtechnicianfor
help.
Canadian Compliance Statement
ThisdigitalapparatusdoesnotexceedtheClassBlimitsforradionoise
emissionsfromdigitalapparatussetoutintheRadioInterferenceRegula-
tionsoftheCanadianDepartmentofCommunications.
Lepresent appareil numerique n'emet pas de bruits radioelectriques
depassantleslimitesapplicablesauxappareilsnumeriquesdelaclassB
prescritesdansleReglementsurlebrouillageradioelectriqueedictepar
leministeredesCommunicationsduCanada.
TheFBX1220&FBX2420Seriesisdesignedtooperatefromstandard
ACpower.Pleasebesurethepowerinyourareaiscompatiblewith
thepowerrequirementsmarkedon the rearofthe unit. Usingthe
wronginputvoltagemaycausepermanentdamagetotheunitand
willvoidthewarranty.
TheFBX1220&FBX2420Seriesissuppliedwithoneofthefollow-
ingACpowercords:
Japan   100VAC
U.S./NorthAmerica 120VAC
ContinentalEurope  230VAC
UnitedKingdom  240VAC
Australia   240VAC
1. Read allsafetyandoperatinginstructions before usingthisprod-
uct.
2. All safety and operatinginstructionsshouldberetained forfuture
reference.
3. Obeyallcautionsintheoperatinginstructionsandontheunit.
4. Alloperatinginstructionsshouldbefollowed.
5. Useonlyshieldedaudioanddatacables.
6. Thisproductshouldnotbeusedinthepresenceofmoistureorrain,
ornearanywater,i.e.,abathtub,sink,swimmingpool,wetbasement,
etc.
7. Thisproductshouldbelocatedsothatitspositiondoesnot
 interferewithproperventilation.Donotuseindirectsunlight.Donot
placeatagainstawallorinabuilt-inenclosurethatwillimpedethe
owofcoolingair.
8. Thisproductshouldnotbeplacednearasourceofheatsuchasa
stoveorradiator.
9. Connectonlytoapowersupplyofthetypemarkedontheunitadjacent
tothepowerentrymodule.
10. Neverbreakoffthegroundpinonthepowersupplycord.
11. Powersupplycordsshouldalwaysbehandledcarefully.Neverwalk
orplaceequipmentonpowersupplycords.Periodicallycheckcords
forcutsorsignsofstress,especiallyattheplugandthepointwhere
thecordexitstheunit.
12. Thepowersupplycordshouldbeunpluggedwhentheunitistobe
unusedforlongperiodsoftime.
13. Careshouldbetakensothatobjectsdonotfallandliquidsarenot
spilledintotheunitthroughtheventilationholesoranyotheropen-
ings.
14. Thisunitshouldbecheckedbyaqualiedservicetechnicianif:
 A.Thepowersupplycordorplughasbeendamaged.
 B.Anythinghasfallenorbeenspilledintotheunit.
 C.Theunitdoesnotoperatecorrectly.
 D.Theunithasbeendroppedortheenclosuredamaged.
15. Theusershouldnotattempttoservicethisequipment.All
 serviceworkshouldbedonebyaqualiedservicetechnician.
Caution!
Replacethefusewithafuseofexactlythesamerating
speciedontherearoftheproduct.
SECTION EIGHT — CAUTIONS & WARRANTY
Warning!

LIT-FBX1220-1224-OP-EN-080208.pmd - ks 11
© 2008 Sabine, Inc.
LIMITED WARRANTY
THISLIMITEDWARRANTYVALIDONLYWHENPURCHASEDANDREGISTEREDINTHE
UNITEDSTATESORCANADA.ALLEXPORTEDPRODUCTSARESUBJECTTOWARRANTY
ANDSERVICESTOBESPECIFIEDANDPROVIDEDBYTHEAUTHORIZEDDISTRIBUTOR
FOREACHCOUNTRY.
Cesclausesdegarantienesontvaiablesqu’auxEtats-UnisetauCanada.Danstouslesautres
pays,lesclausesdegarantieetdemaintenancesontxeesparledistributeurnationaletas-
sureeparluiselonlalegislationenvigueur.
DieseGarantieistnurindenUSAandKanadagultig.AlleExport-ProduktesindderGarantie
unddemServicedesImporteursdesjewelligenLandesuntervorfen.
EstagarantiaesvalidasolamentecuandoelproductoescompradoenE.U.continentalesoen
Canada.Todoslosproductosqueseancompradosenelextranjero,estansujetosalasgarantias
yservicioquecadadistribuidorautorizadodetermineyotrezcaenlosdiferentespaises.
ONE-YEAR LIMITED WARRANTY/REMEDY
SABINE,INC.(“SABINE”)warrantsthisproducttobefreefromdefectsinmaterialandworkman-
shipforaperiodofone(1)yearfromdateofpurchasePROVIDED,however,thatthislimited
warrantyis extended only to the originalretail  purchaserand is subject to the conditions,
exclusionsandlimitationshereinaftersetforth:
CONDITIONS, EXCLUSIONS AND LIMITATIONS OF LIMITED WARRANTIES
Theselimitedwarrantiesshallbevoidandofnoeffectif:
a. Therstpurchaseoftheproductisforthepurposeofresale;or
b.TheoriginalretailpurchaseisnotmadefromanAUTHORIZEDSABINEDEALER;or
c.Theproducthasbeendamagedbyaccidentorunreasonableuse,neglect,improperservice
ormaintenance,orothercausesnotarisingoutofdefectsinmaterialorworkmanship;or
d.Theserialnumberafxedtotheproductisaltered,defacedorremoved;or
e. Thepowersupplygroundingpinisremovedorotherwisedefeated.Intheeventofadefect
inmaterialand/orworkmanshipcoveredbythislimitedwarranty,Sabinewillrepairthedefect
inmaterialorworkmanshiporreplacetheproduct,atSabine’soption;andprovided,however,
that,inanycase,allcostsofshipping,ifnecessary,arepaidbyyou,thepurchaser.
WARRANTYREGISTRATIONCARDSHOULDBECOMPLETEDANDRECEIVEDBYSABINE
WITHINFOURTEEN(14)DAYSOFTHEDATEOFYOURPURCHASE.
Inordertoobtainserviceunderthesewarranties,youmust:
a.Bring the defective item to any Authorized SABINE DEALER and present therewith the
ORIGINALPROOFOFPURCHASEsuppliedtoyoubytheAUTHORIZEDSABINEDEALER
inconnectionwithyourpurchasefromhimofthisproduct.IftheDEALERisunabletoprovide
thenecessarywarrantyservice,youwillbedirectedtothenearestotherSABINEAUTHORIZED
DEALERwhichcanprovidesuchservice.OR
b.Shipthedefectiveitem,prepaid,to:
SABINE,INC.
 13301HIGHWAY441
 ALACHUA,FL32615-8544
 Includetherewithacomplete,detaileddescriptionoftheproblem,togetherwithalegiblecopy
oftheoriginalPROOFOFPURCHASEandacompletereturnaddress.UponSabine’sreceipt
oftheseitems:
a.Ifthe defectisremedial under the limited warrantiesandthe other terms andconditions
expressedhavebeencompliedwith,Sabinewillprovidethenecessarywarrantyserviceto
repairorreplacetheproductandwillreturnit,FREIGHTCOLLECT,toyou,thepurchaser.
b.Sabine’sliabilitytothepurchaserfordamagesfromanycausewhatsoeverandregardless
oftheformofaction,includingnegligence,islimitedtotheactualdamagesuptothegreater
of$500.00oranamountequaltothepurchasepriceoftheproductthatcausedthedamage
orthatisthesubjectoforisdirectlyrelatedtothecauseofaction.Suchpurchaseprice
willbethatineffectforthespecicproductwhenthecauseofactionarose.Thislimitation
ofliabilitywillnotapplytoclaimsforpersonalinjuryordamagetorealpropertyortangible
personalpropertyallegedlycausedbySabine’snegligence.Sabinedoesnotassumeliability
forpersonalinjuryorpropertydamagearisingoutoforcausedbyanon-Sabinealteration
orattachment, nordoes Sabine assumeany responsibility fordamageto interconnected
non-Sabineequipmentthatmayresultfromthenormalfunctioningandmaintenanceofthe
Sabineequipment.
UNDERNOCIRCUMSTANCESWILLSABINEBELIABLEFORANYLOSTPROFITS,LOST
SAVINGS,ANYINCIDENTALDAMAGESORANYCONSEQUENTIALDAMAGESARISING
OUTOFTHEUSEORINABILITYTOUSETHEPRODUCT, EVENIFSABINEHASBEEN
ADVISEDOFTHEPOSSIBILITYOFSUCHDAMAGES.
THESELIMITEDWARRANTIESAREINLIEUOFANYANDALLWARRANTIES,EXPRESSOR
IMPLIED,INCLUDINGBUTNOTLIMITEDTO,THEIMPLIEDWARRANTIESOFMERCHANT-
ABILITYANDFITNESSFORAPARTICULARUSE;PROVIDED,HOWEVER,THATIFTHE
OTHERTERMSANDCONDITIONSNECESSARYTOTHEEXISTENCEOFTHEEXPRESS
LIMITEDWARRANTIES,ASHEREINABOVESTATED,HAVEBEENCOMPLIEDWITH,IMPLIED
WARRANTIES ARE NOT DISCLAIMED DURINGTHE APPLICABLE ONE-YEAR PERIOD
FROMDATEOFPURCHASEOFTHISPRODUCT.
SOMESTATESDONOTALLOWLIMITATIONONHOWLONGANIMPLIEDWARRANTYLASTS,
ORTHEEXCLUSIONORLIMITATIONOFINCIDENTALORCONSEQUENTIALDAMAGES,
SOTHEABOVELIMITATIONSOREXCLUSIONSMAYNOTAPPLYTOYOU.THESELIMITED
WARRANTIESGIVEYOUSPECIFICLEGALRIGHTS,ANDYOUMAYALSOHAVEOTHER
RIGHTSWHICHMAYVARYFROMSTATETOSTATE.
THESELIMITEDWARRANTIESARETHEONLYEXPRESSWARRANTIESONTHISPRODUCT,
ANDNOOTHERSTATEMENT,REPRESENTATION,WARRANTYORAGREEMENTBYANY
PERSONSHALLBEVALIDORBINDINGUPONSABINE.
 Intheeventofanymodicationordisclaimerofexpressorimpliedwarranties,oranylimitation
ofremedies,containedhereinconictswithapplicablelaw,thensuchmodication,disclaimer
orlimitation,asthecasemaybe,shallbedeemedtobemodiedtotheextentnecessaryto
complywithsuchlaw.
 Yourremediesforbreachofthesewarrantiesarelimitedtothoseremediesprovidedherein,
andSabinegivesthislimitedwarrantyonlywithrespecttoequipmentpurchasedintheUnited
StatesofAmerica.
INSTRUCTIONS — WARRANTY REGISTRATION
•MailthecompletedWARRANTYREGISTRATIONCARDto:
SABINE,INC.
 13301HIGHWAY441
 ALACHUA,FL32615-8544
•Or,registeronlineatwww.Sabine.com
IMPORTANT:BesuretokeepthePROOFOFPURCHASE.Intheeventwarrantyserviceis
requiredduringthewarrantyperiod,youwillneedthisdocument.Therewillbenoidentication
cardissuedbySabine,Inc.
IMPORTANCEOFWARRANTYREGISTRATION&NOTIFICATIONOFADDRESSCHANGE:
a.Should notication become necessary for any condition that may require correction, the
REGISTRATIONCARDwillhelpensurethatyouarecontactedandproperlynotied.
b.Notice of address changes — If you move from the address shown on the WARRANTY
REGISTRATIONCARD,youshouldnotifySabineofthechangeofaddresssoastofacilitate
yourreceiptofanybulletinsorotherformsofnoticationwhichmaybecomenecessaryin
connectionwithanyconditionthatmayrequiredisseminationofinformationorcorrection.
YoumaycontactSabinedirectlybytelephoning(386)418-2000.
PleasehavetheSabineproductnameandserialnumberavailablewhencommunicatingwith
SabineCustomerService.
EXPOSURETO EXTREMELY HIGH NOISE LEVELS MAY CAUSE A PERMANENT HEARING
LOSS. INDIVIDUALS VARY CONSIDERABLY IN SUSCEPTIBILITY TO NOISE INDUCED
HEARING LOSS, BUT NEARLY EVERYONE WILL LOSE SOME HEARING IF EXPOSED
TO SUFFICIENTLY INTENSE NOISE FOR A SUFFICIENT TIME. THE U.S. GOVERNMENT’S
OCCUPATIONAL SAFETY AND HEALTH ADMINISTRATION (OSHA) HAS SPECIFIED THE
NOISE LEVEL EXPOSURES AT RIGHT AS PERMISSIBLE :
ACCORDING TO OSHA, ANY EXPOSURE IN EXCESS OF THE ABOVE PERMISSIBLE
LIMITS COULD RESULT IN HEARING LOSS. EAR PLUGS OR PROTECTORS IN THE EAR
CANALS OR OVER THE EARS MUST BE WORN WHEN OPERATING THIS DEVICE IN
ORDER TO PREVENT A PERMANENT HEARING LOSS, IF EXPOSURE IS IN EXCESS OF
THE LIMITS AS SET FORTH ABOVE. TO ENSURE AGAINST POTENTIALLY DANGEROUS
EXPOSURETO HIGH SOUND PRESSURE LEVELS, IT IS RECOMMENDEDTHAT ALL PER-
SONS EXPOSED TO EQUIPMENT CAPABLE OF PRODUCING HIGH SOUND PRESSURE
LEVELS SUCH AS THIS DEVICE BE PROTECTED BY HEARING PROTECTORS WHILE
THIS UNIT IS IN OPERATION.
CAUTION
DURATION PER DAY, HOURS SOUND LEVEL dBA SLOW
RESPONSE
8 90
6 92
4 95
3 97
2 100
1-1/2 102
1 105
1/2 110
1/4 or less 115 http://www.osha.gov
1926.52(d)(1)

Sabine, Inc. • 13301 NW US Highway 441 • Alachua, Florida 32615-8544 USA • Phone: [phone] • Fax: [phone]
Register your FBX equipment
online at Sabine.com
Or... Push READY anytimetoexit SetupMode
When Filter LEDs cycleleft&right, Stop Raising Gain
Raise Gain Slowly
Push&Hold SETUP Do Not Talk into Mics!
a c t i O n c O n t r O l s l e d s t a t u s d e t a i l s
Stop raising gain when all lter LEDs light back and forth in sequence and turn red; the rst Dynamic lter (green LED) is also set. Setup has now completed. You are ready to go! Important: Reduce gain slightly. This will be your maximum gain setting. Push READY button at any time to exit Setup mode. You are ready to go. The blue LED will ash. Push READY again at any time to Lock Fixed lters - the blue LED stays lit. See the operating guide for more information on locking xed lters. Raise gain slowly. Fixed lter LEDs will ash amber and then remain lit one at a time as lters are set. Wireless Mics: If you are using a wireless mic, stop raising gain after a few lters and move the microphone to another performance area; continue slowly raising gain and repeat. LEDs will ash 5 times, followed by the SETUP button LED ashing. You are now in FBX Setup mode. Do not speak into the mic or play program though the system.
SABINE FBX SETUP
4 3 2 1
Yourmixer
STOP
f i x e d
UNLOCKED
SETUP MODE
UNLOCKED
SETUP MODE
LOCKED
READY MODE
UNLOCKED
READY MODE
For complete instructions, please read the operating guide!