OPERATING GUIDE
V2
QUICK-START OPERA TION 1
DECLARATION OF CONFORMITY 2
APPLICATION OF COUNCIL DIRECTIVE 2
ABOUT THE FBX-2020 3
FREQUENCY RESPONSE 3
WORLD'S BEST FEEDBACK CONTROLLER 3
WHO NEEDS FBX? 3
WHY THE FBX? 3
DIRECT HIT ON FEEDBACK!3
ACTIVE/BYPASS SWITCH 4
SIGNAL LEVEL 4
RESET 4
SET TOTAL NUMBER OF FILTERS 4
SET FIXED 4
LOCK FIXED FILTERS 4
A/C POWER INPUT 4
AUDIO INPUTS & OUTPUTS 4
FBX-2020 CONTROLS 4
FIFTH OCTAVE 4
FILTER STAGE ACTIVITY 4
POWER SWITCH 4
FUSE 4
APPLICATION DIAGRAMS 5
FBX SETUP FOR MONITORS 5
FBX SETUP FOR ENTIRE MIX 5
FBX SETUP FOR SINGLE INSERT POINT 6
FBX SETUP FOR INSERT SEND & RETURN 6
FBX-2020 6
OPERATING 6
INSTRUCTIONS 6
WHERE THE FBX FITS IN YOUR SOUND SYSTEM 6
A NOTE ABOUT GRAPHIC EQUALIZERS 6
UNDERST ANDING FIXED & DYNAMIC FIL TERS 6
CLIPGUARD™ ADAPTIVE CLIP LEVEL CONTROL 6
LIPGUARDTM TURBO MODE GUIDE 6
C
HOW TO OPERATE THE FBX-2020 7
HOW TO USE THE FBX-2020 FEA TURES 8
USING THE LOCK FIXED FEA TURE 8
SELECTING FILTER WIDTH 8
IMPORTA NT OPERATING CONSIDERATIONS 8
MEMORY 8
BYPASS MODE 8
RESETTING THE FILTERS 8
TURBO MODE SETUP 8
DEFEATING TURBO MODE 8
MOBILE VS. STATIONARY MICROPHONES 8
FREQUENTL Y ASKED QUESTIONS 9
INDEX 9
FBX-2020 ENGINEERING SPECIFICATIONS 10
CAUTIONS & WARNINGS 11
LIMITED WARRANTY 12
QUICK-START OPERATION
For best results, read all operating instructions before using the FBX-2020. If you're already
familiar with the FBX or just want a basic overview of FBX operation, this simple quick-start
procedure is for you. More detailed instructions are on page 7 inside this operating guide.
1. Place the FBX between the output of your mixer and the input of your power amp.
2. With the master volume down, put the FBX-2020 in active mode (red BYPASS LED off), then
slowly raise the mixer master volume to the point of feedback.
3. Keep raising the master volume until all of your fixed filters and one dynamic filter are set, then
lower the volume slightly. (Factory default is nine fixed and three dynamic filters.) The rest of
the filters continually catch and update new feedback frequencies throughout the program.
You're ready to go.
READ THE ENTIRE OPERATING GUIDE FOR COMPLETE INSTRUCTIONS.
CONGRATULATIONS! You now have the state-of-the-art in feedback control. Your Sabine FBX-2020 Feedback Exterminator® — a single channel,
20-bit digital filtering device — gives you automatic real-time feedback control and increases the clarity and volume of your system.
The FBX-2020 incorporates the latest in digital signal processing technology. It automatically senses feedback in a sound system and determines
its pitch. It then places one of 10 Constant Q micro-filters on the resonating frequency and eliminates the feedback in typically less than one second.
Special features of the FBX-2020:
• An improved algorithm that allows the FBX-2020 to better distinguish the difference between feedback and music
• Improved 20-bit digital resolution, providing superior dynamic range and signal-to-noise ratio
• 10 feedback filters, giving the unit more feedback elimination power for the toughest venues.
• ClipGuard™ adaptive clip level control, with TURBO setup mode, increases the effective dynamic range by more than 10dB
and makes setup faster and easier.
• Standard FBX features such as lockable fixed filters and switchable 1/10- and 1/5-octave Constant Q filters are also included
and now have convenient front panel switches.
© 1995-2001 Sabine, Inc.
DECLARATION OF CONFORMITY
Application of Council Directive: 73/23/EEC and 89/336/EEC
Standard to which conformity is declared:
EN 55022 Class B
Manufacturer’s Name: Sabine, Inc.
Manufacturer’s Address: 13301 Highway 441
Alachua, FL 32615-8544 USA
EN 60065:1993
EN 50082-1:1992
T ype of Equipment: Equalizer
Model No.: FBX-2020
Serial No.:
Year of Manufacture: 1997 and on
I, the undersigned, herby declare that the equipment specified above conforms to the above Directive and Standard.
Place: Alachua, Florida, USA Signature:
Date: October 4, 2000 Full Name: Doran Oster, Sabine President
2
ABOUT THE FBX-2020
Feedback
Frequency
FREQUENCY RESPONSE: FBX 1/10-Octave Filter Vs.
1/3-Octave Graphic EQ Filter (12 dB depth; Log Scale).
FBX filter
Frequency Response
Full Set-Up FBX Vs. 1/3 Octave Graphic Equalizer. Test procedure: A PA system was set up
using a microphone, mixer, FBX, power amp and
two speakers. The system's gain was raised
until the FBX removed nine feedback points.
Next, the FBX was replaced with a 1/3 octave
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.
Direct Hit on Feedback!
The FBX targets feedback without taking a big chunk out of your
sound. Tests prove that a single 1/3-octave EQ slider pulled down
12 dB removes almost half the power going to the speakers over
a two-octave range. And, as this illustration shows, you can't place
a graphic EQ filter precisely on the ringing frequency. When you
pull down multiple sliders in a normal setup (below), you end up
with giant holes in your music. On the other hand, FBX micro-filters
are 10 times narrower - you get back up to 90% of the power you
lose with a graphic EQ! That means more gain before feedback
and no loss in sound quality.
World's Best Feedback Controller
Before the invention of the FBX, the most common device for controlling feedback was the 31-band graphic EQ. However, the
FBX has three distinct advantages. The most obvious is the FBX functions automatically, even during the program. Another is
the FBX micro-filters are precisely placed while EQ filters are fixed. The difference: FBX filters do not have to be as deep, so there
is more system gain. The most important advantage is that FBX micro-filters are ten times narrower than 31-band EQ filters.
FBX micro-filters return up to 90 percent of the power removed by EQ filters.
Over the years, engineers stopped using 12-band EQs in favor of the narrower-filter 31-band EQ for controlling feedback. The
FBX represents the next step. An EQ would need more than 10,000 sliders to be equivalent to your FBX. With the FBX-2020,
your monitors will finally sound loud enough, everyone in the audience will understand each word, and the mains will sound
natural and transparent.
Who Needs FBX?
Virtually every sound system will be improved with the FBX. Small bands that do not have sound technicians can now increase
their monitor volumes so they can hear themselves clearly and with full fidelity, without worrying if the program is going to be ruined
by feedback.
Auditoriums and churches of all sizes will enjoy reliable feedback control. Hotels and conference centers around the world can
offer meeting rooms with sound systems that won’t howl during programs. The FBX-2020 can be installed in theaters, schools,
sports arenas, courtrooms — anywhere multiple microphones are used. It can also be used for teleconferencing, intercoms
or interactive remote classrooms.
Why the FBX?
The simple beauty of the FBX is its ability to quickly and effectively eliminate feedback with narrower filters than ever before
possible. The FBX delivers superior sound quality automatically.
3
3
FBX-2020 CONTROLS
FBX-2020 Front Panel
Active/Bypass Switch
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.
Signal Level
The LED ladder indicates the signal strength relative to the
FBX's input clip level. The red CLIP LED indicates clipping; it
also indicates the unit is in TURBO mode.
Reset
To reset ALL filters, hold the reset button for 4 seconds until all
filter LEDs are off.
Set Total Number of Filters
To set the total number of filters, depress the button for 4
seconds and then release. The LEDs will begin to light in
sequence. When the LED corresponding to the desired
number of filters lights, press the button to register your
selection.
Set Fixed
To set fixed filters, hold down the button for 4 seconds and then
release. The LEDs will begin to light in sequence. When the
LED corresponding to the desired number of fixed filters lights,
press the button to register your selection. (Factory default is
nine fixed and three dynamic filters.)
Lock Fixed Filters
When the LOCK FIXED button is pressed, its LED will light to
indicate that the FBX is in LOCK FIXED mode. LOCK FIXED
mode can be activated at any time after system setup and will
stay on until the button is pressed again and the LED turns off.
Engaging the LOCK FIXED button also takes the FBX-2020 out
of ClipGuard's TURBO setup mode.
Fifth Octave
Press the button at any time to select wider filters for any new
filters to be set. It is possible to have both 1/5 and 1/10 octave
Constant Q filters active in one channel simultaneously.
Filter Stage Activity
When one of the unit’s 10 filters is activated, the corresponding
LED lights. A blinking LED indicates the filter that was most
recently activated.
Power Switch
The ON/OFF switch is a two-position push button switch. The
power indicator LED will light when the FBX is operational.
FBX-2020 Back Panel
A/C Power Input
The FBX-2020 is factory configured to operate at either 115 VAC
or 230 VAC. Using the wrong input voltage may cause permanent damage to the unit and will void the warranty.
Audio Inputs & Outputs
1/4" TRS and XLR balanced and unbalanced.
4
Fuse
This equipment is fitted with an IEC power inlet incorporating
a built-in fuse holder. To change the fuse in this socket:
1.Disconnect the power cord from the unit.
2.Pull out the fuse holder and remove the old fuse.
3. Install the new fuse into the holder. Replace only with
5x20mm, 0.315A, 250V F (fast acting) fuse.
4.Refit the fuse cover.
APPLICATION DIAGRAMS
FBX Setup for Monitors
FBX Out
FBX IN
Amp In
FBX Setup for Entire Mix
Monitor OUT
FBX OUT
Amplifier
Amp IN
Amplifier
FBX IN
All other Signal
Processing
Equipment
Main OUT
5
FBX Setup for Single Insert Point
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" (Ring/Tip/Sleeve) outputs,
you must use that type of connector. If you
don't, you may experience a loss of gain when
using the FBX.
The FBX is designed for balanced output. If
either side of the balanced output is grounded
at any point, a 6 dB loss in dynamic range may
occur (+21dBV max. signal level unbal.; +27dBV
max. signal level bal.).
FBX-2020 OUTPUT & INPUT
Use 1/4" TRS plug for balanced sends/inserts
Use 1/4" TS plug for unbalanced sends/inserts
Mixer
Input
Channel
B
1/4" TRS plug
Mixer
Input
Channel
A
1/4" TRS plug
Mixer Input
Channel B
Low Z
High Z
Insert
Low Z
High Z
Insert
FBX Setup for Insert Send & Return
FBX-2020
OPERATING
INSTRUCTIONS
Where the FBX fits in your sound system
Place the FBX anywhere in the sound system that a graphic
equalizer might be used to control feedback. The most common place 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. The FBX can
also be used on a mixer insert point.
A note about graphic equalizers
Graphic EQs are excellent for shaping sound, and they are fairly
simple to use. However, using one-octave-wide EQ filters to
control feedback invariably causes an unnecessary decrease
in the gain and fidelity of the program. It's easy to see that if
feedback occurs somewhere between the sliders, you will
have to pull one of those EQ sliders down pretty far to eliminate
feedback. That pulls out plenty of your program, too. On the
other hand, you'll get considerably more net gain and much
better sound quality if you use wide graphic EQ filters for tone
control and insist on narrow filters for feedback control.
If you 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.
Understanding FIXED & DYNAMIC filters
Before operating the FBX, you need to understand the two
!
types of FBX filters: FIXED and DYNAMIC. FIXED FILTERS
Read
This
retain their frequency center-points until the unit is reset by
the user. The system’s gain before feedback is limited primarily by
6
FBX-2020 OUTPUT & INPUT
Mixer
Input
Channel
B
Mixer
Input
the number of fixed filters; i.e., increasing the
number of fixed filters
increases the
system’s gain before
feedback. 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.
Channel
A
ClipGuard™ Adaptive Clip Level Control
Your FBX-2020 has a powerful new feature: Sabine's
!
patented ClipGuard™ adaptive clip level control. Until
Read
This
audio equipment input and output levels to a compromised
setting that allowed too much noise in quiet programs and risked
clipping during high-level programs. With ClipGuard™, no front
panel program level control is needed. It automatically matches
the FBX-2020 internal dynamic range to the constantly changing
program level and maintains unity gain. ClipGuard™ extends the
effective dynamic range of your FBX-2020 from 100dB to 105dB!
ClipGuard™ incorporates TURBO mode setup, another new
feature. It cuts the time for FBX filter initialization to just a few
Sabine invented ClipGuard™, engineers had to set
Low Z
High Z
Insert
Send
Insert
Return
Low Z
High Z
Insert
Send
Insert
Return
seconds, and it greatly reduces the volume level of the feedback
during setup. The FBX-2020 is set in TURBO mode at the factory
and automatically engages every time you press RESET or SET
TOTAL NO (to reset filters or set total number of filters). The
FBX-2020 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.
How To Operate The FBX-2020
!
Read
Follow these steps to obtain the maximum gain before feed-
This
back without changing the tonal quality of your program.
1.Place the speakers and microphones in the positions
where they will be used during the program. Avoid placing
microphones directly in front of speakers.
2.If you possess any equipment in the signal path with a noise
gate, you MUST DISENGAGE these noise gates prior to the
setup procedure. You may reengage these noise gates
upon conclusion of your FBX setup. (It is also recommended
to disengage compressors in the signal path)
3.Set the master volumes to their lowest positions. Turn on
the mixer, then the FBX (make sure the FBX is in BYPASS
mode, with the red BYPASS LED on), 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.
4. Press RESET until all LEDs stop flashing.
5.You may set the total number of filters you want to activate
(factory default is 10 filters - skip to #6 if default is OK for your
application) by holding down the SET TOTAL NO. button for
4 seconds. The LEDs will blink 4 times and then go out.
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.Now set the number of fixed filters you need (factory default
is 7 fixed and 3 dynamic - skip to #7 if default is OK for your
application). Depress the SET FIXED button for 4 seconds.
The total number of enabled filters set in step 5 will blink
4 times and 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.
7.Press BYPASS to put the FBX in active mode (red LED off).
8.Slowly raise the sound system’s master volume 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. (The
Clip Level mode LED will go off.)
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. You're ready to go. ClipGuard™ will automatically match
the input level to the best internal dynamic range.
ClipGuard
What is TURBO
mode?
How do I know
TURBO is on?
How do I turn off
TURBO?
Can the 2020
work during the
program with
TURBO on?
Why won't all the
fixed filters set?
TM
TURBO Mode Guide
TURBO mode speeds up the FBX filter initialization process so that it takes only a few
seconds, and it greatly reduces the volume
level of the feedback during setup.
If the red CLIP LED flashes when no other
signal level LEDs are on, TURBO is on.
TURBO turns off automatically after the first
dynamic filter is set, or you can turn it off
manually by pressing the LOCK FIXED button.
(Press it again to unlock the filters.)
NO! TURBO mode should be turned off either
automatically or manually before your program begins. If left on, the 2020 will clip, may
set FBX filters improperly.
If you press LOCK FIXED to turn off TURBO
mode before all the fixed filters have been
set, and you want to use the rest of the fixed
filters, press LOCK FIXED again right away
before a dynamic filter sets. Once a dynamic
filter sets, you will not be able to use the rest
of the fixed filters unless you reset and start
the initialization again.
NOTE: If you press LOCK FIXED to turn off TURBO mode
before all the fixed filters have been set, and you want to
use the rest of the fixed filters, press LOCK FIXED again
right away — before a dynamic filter sets. Once a dynamic filter sets, you will not be able to use the rest of the
fixed filters unless you reset and reinitialize the unit.
WARNING: Follow the setup procedure outlined on the
left, and do not play audio program during TURBO setup
mode. Otherwise, the FBX-2020 will clip and may set FBX
filters 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. Press LOCK FIXED again
if you want FIXED filters to remain active.) You'll know the
2020 is in TURBO mode if the red CLIP LED flashes
when no other signal level LEDs are on. (See "How do
I turn off Turbo?" in the ClipGuard TURBO Mode Guide
above.)
NOTE: Any loud sounds picked up by open microphones
while TURBO is engaged may cause FBX filters to set.
For this reason we recommend maintaining silence as
much as possible during the short time TURBO is
engaged.
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.
IMPORTANT TIP
You can mix 1/10- and 1/5-octave filters in the same channel. If
you have an especially bad feedback problem, try making the first
few filters 1/5-octave and the remaining filters 1/10-octave.
7
How To Use The FBX-2020 Features
Using the LOCK FIXED feature
In very few 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
after setup. The LOCK FIXED LED will light to indicate that the
FBX is in LOCK FIXED mode. The fixed filters stay locked until
you press the LOCK FIXED button again.
Selecting filter width
If you're using the FBX for a music application, the standard 1/
10-octave Constant Q filter is usually preferable. However, in
spoken word applications, such as lectures or teleconferencing, we recommend using the wider 1/5-octave filter for more
robust feedback 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. You can mix filter widths in the
same channel (see "IMPORTANT TIP" below).
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 outputs is used, the signal may be disconnected in BYPASS MODE.
Resetting the filters
The user 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 the LEDs flash about 4 seconds — and the FILTER LEDs
stop flashing. Then follow the system initialization procedure
explained previously.
TURBO Mode Setup
The FBX-2020 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 2020 is set in TURBO mode at the
factory and automatically engages every time you
press RESET (resetting filters). The 2020 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 2020
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 2020
is in TURBO mode if the red CLIP LED flashes when no
other signal level LEDs are lit.
Defeating Turbo Mode
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 microphone 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.
8
FREQUENTLY ASKED QUESTIONS
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 if possible. You can configure the
system this way
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 are com-
patible. 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 setup, 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.
only
if each effects send of each mixer
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 with 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 begins. Check the signal level ladder. If the
red CLIP LED flashes when no other signal level LEDs are
on, the FBX-2020 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. Why won't the rest of the fixed filters set after I press
LOCK FIXED to turn off TURBO mode?
A. If you press LOCK FIXED to turn off TURBO mode before
all the fixed filters are set, and you want to use the rest of
the fixed filters, press LOCK FIXED again
filter sets. Once a dynamic filter sets, you will not be able
to use the rest of the fixed filters unless you reset the unit
and start initialization again.
before
a dynamic
INDEX
Symbols
1/10 Octave Filter 3, 4, 7, 8
1/3 Octave Filter 3
1/5 Octave Filter 1, 4, 7, 8
A
Adaptive Clip Level 6
B
Balanced/Unbalanced IN/OUT 4, 6, 8
Bypass 4, 7, 8
C
ClipGuard 4, 6, 7
D
Dynamic Filter 4, 7
F
Filter LEDs 7, 8
Fixed Filter 4, 6, 7
Fuse 4, 10, 11
L
Lock Fixed 4, 7, 8
M
Master Volume 7, 8
Microphone 3, 7, 8
Monitor 3, 5
Music Application (for FBX) 8
P
Pipe Organs & FBX 8
R
Reset 6, 7, 8
S
Send & Return 6
Set Fixed 4, 7
Set Total Number of Filters 7
Software Installation 11
Spoken Word Application (for FBX) 8
T
Turbo Mode 4, 6, 7, 8
V
Voltage 4, 11
W
Wireless Microphones 8
9
FBX-2020 ENGINEERING SPECIFICATIONS
FILTERS
10 independent digital notch filters, controlled automatically from 40
Hz to 20 KHz.
Filter width: user-controllable, either 1/10 or 1/5 oct., Constant Q
Resolution: 1/50th Octave
Time required to find and eliminate feedback: 0.4 seconds,
typical @ 1KHz
Total number of combined filters active: user selectable, from
1-10
Number of dynamic vs. fixed filters: user selectable
LAST CONFIGURATION STORED IN MEMORY
INPUT/OUTPUT
2
Input/Output Maximum Signal Levels: Balanced +27dBV peak,
unbalanced +21 dBV peak
Output Drive: Unit will perform as specified driving a load >600
Ohms
Input Impedance: Balanced or unbalanced >10K Ohms, PIN 2 high
Output Impedance: Balanced or unbalanced 10 Ohms nominal, PIN
2 high
Bypass: True power off bypass
Headroom: +23dB peak @ 4dBV nominal input, balanced
I/O Connectors: XLR-3 and 1/4" TRS
PERFORMANCE
3
Spectral Variation: < .25 dB, 20Hz to 20 KHz
SNR: >100 dB, typical, "A" weighted
(SPECIFICATIONS SUBJECT TO CHANGE WITHOUT NOTICE)
THD: <0.02% @ 23 dBV sine wave at 1 KHz
Dynamic Range: >110 dB with ClipGuard™ automatic clip level
control active
1
POWER INPUT
Factory configured to either 115 VAC or 230 VAC. 50/60 Hz, 12
Watt input.
FUSE REPLACEMENT
To reduce the risk of fire, replace only with 5x20 mm, .315 A, 250 V,
fast-acting fuse.
DIMENSIONS
1-U rack mount; 19 x 1.75 x 8.0 ins. nominal (rack mountable); 48.3 x
4.5 x 20.3 cm nominal (rack mountable)
WEIGHT
7.0 lbs. (3.3 kg) nominal
OPTIONS
Input/output transformer option
All FBX Feedback Exterminators conform to all Year 2000 (Y2K)
standards.
NOTES
1
Below approximately 200 Hz the feedback filters become slightly
wider to increase the feedback and rumble capture speed at these
low frequencies.
2
Note: Inputs may be balanced or unbalanced. For maximum output
capability, outputs must be balanced (XLR or TRS). If either side of
an output is grounded, the peak output and dynamic range will be
reduced by 6 dB.
3
Tests performed using an Audio Precision System One model 322
or equal.
10
FBX-2020 SIMPLIFIED INTERNAL BLOCK DIAGRAM
(Shows one channel only)
CAUTIONS & WARNINGS
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 qualified service personnel.
Warning! To reduce the risk of fire 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 accessible
à l'intérieur. S'addresser à un technicien qualifié.
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 T eile im Geräteinneren.
Überlassen Sie das Gerät zu Servicezwecken nur geschultem Fachpersonal.
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 cualificado.
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, Class B, of the FCC Rules. Operation is
subject to the following conditions: (1) This device may not cause harmful
interference; and (2) This device must accept any interference received,
including interference that may cause undesired operation.
Changes or modifications 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 Regulations 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.
Japanese EMI Compliance Statement
Warning:
Warning!
The unit 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 FBX-2020P is supplied with one of the following AC power cords:
Japan 100 VA C
U.S./North America 120 VA C
Continental Europe 230 VAC
United Kingdom 240 VA C
Australia 240 V AC
Caution!
Replace the fuse with a fuse of exactly the same rating specified on the
rear of the product.
1. Read all safety and operating instructions before using this product.
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 flat against a wall or in a built-in enclosure that will impede
the flow 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
openings.
14. This unit should be checked by a qualified 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 qualified service technician.
OSHA 2201; 1995 revised.
11
EXPOSURE TO EXTREMEL Y HIGH NOISE LEVELS MA Y CAUSE A PERMANENT HEAR-
CAUTION
ING LOSS. INDIVIDUALS VARY CONSIDERABLY IN SUSCEPTIBILITY TO NOISE INDUCED
HEARING LOSS, BUT NEARLY EVER YONE WILL LOSE SOME HEARING IF EXPOSED T O
SUFFICIENTLY INTENSE NOISE FOR A SUFFICIENT TIME. THE U.S. GOVERNMENT’S
OCCUPA TIONAL SAFETY AND HEAL TH ADMINISTRA TION (OSHA) HAS SPECIFIED THE
FOLLOWING PERMISSIBLE NOISE LEVEL EXPOSURES:
DURATION/DA Y IN HOURS SOUND LEVEL IN dBA, SLOW RESPONSE
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 POTENTIALL Y DANGEROUS
EXPOSURE TO HIGH SOUND PRESSURE LEVELS, IT IS RECOMMENDED THAT ALL
PERSONS EXPOSED TO EQUIPMENT CAP ABLE OF PRODUCING HIGH SOUND PRESSURE LEVELS SUCH AS THIS DEVICE BE PROTECTED BY HEARING PROTECTORS
WHILE THIS UNIT IS IN OPERATION.
8 90
6 92
4 95
3 97
2 100
1-1/2 102
1 105
1/2 110
1/4 or less 1 15
FBX and FBX Feedback Exterminator are registered trademarks
of Sabine, Inc., and are the brand names of its line of automatic
feedback controllers. Covered by U.S. Patent No. 5,245,665,
Australian Patent No. 653,736, Canadian Patent No. 2,066,624-2,
German Patent No. 691 18486.0, and U.K. Patent No. 0486679.
Other patents pending.
REAL-Q and REAL-Q2 are protected by U.S. Patent No. 5,506,910.
Other patents pending.
Graphi-Q, POWER-Q, REAL-Q, and REAL-Q2 are trademarks of
Sabine, Inc.
Copyright 2001. All rights reserved.
Register your Sabine products online at:
www.Sabine.com
THIS LIMITED WARRANTY V ALID ONLY WHEN PURCHASED AND REGISTERED IN THE
LIMITED WARRANTY
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 fixees par le distributeur national et assuree 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. T odos 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 workmanship
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 LIMIT ATIONS OF LIMITED WARRANTIES
These limited warranties shall be void and of no effect if:
a. The first 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 affixed 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 rep air 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 p aid by you, the purchaser.
THE WARRANTY REGISTRA TION CARD (or ONLINE REGISTRATION FORM) SHOULD
BE ACCURATELY COMPLETED, MAILED TO AND RECEIVED BY SABINE WITHIN FOURTEEN (14) DAYS FROM THE DA TE 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:
Include therewith 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:
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.
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 specific
product when the cause of action arose. This limitation of liability will not apply to claims for personal
SABINE, INC.
13301 HIGHWA Y 441
ALACHUA, FL 32615-8544
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, AN Y 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 MERCHANTABILITY AND FITNESS FOR A P ARTICULAR USE; PROVIDED, HOWEVER, THA T IF
THE OTHER TERMS AND CONDITIONS NECESSARY TO THE EXISTENCE OF THE EXPRESS LIMITED WARRANTIES, AS HEREINABOVE ST A TED, HA VE BEEN COMPLIED WITH,
IMPLIED WARRANTIES ARE NOT DISCLAIMED DURING THE APPLICABLE ONE-YEAR
PERIOD FROM DATE OF PURCHASE OF THIS PRODUCT.
SOME STA TES DO NOT ALLOW LIMIT A TION ON HOW LONG AN IMPLIED WARRANTY
LASTS, OR THE EXCLUSION OR LIMITA TION OF INCIDENT AL OR CONSEQUENTIAL DAMAGES, SO THE ABOVE LIMIT A TIONS OR EXCLUSIONS MA Y NOT APPL Y TO YOU. THESE
LIMITED WARRANTIES GIVE YOU SPECIFIC LEGAL RIGHTS, AND YOU MA Y ALSO HA VE
OTHER RIGHTS WHICH MAY VAR Y FROM ST A TE TO ST A TE.
THESE LIMITED WARRANTIES ARE THE ONL Y EXPRESS WARRANTIES ON THIS PRODUCT, AND NO OTHER ST A TEMENT , REPRESENT A TION, WARRANTY OR AGREEMENT B Y
ANY PERSON SHALL BE V ALID OR BINDING UPON SABINE.
In the event of any modification or disclaimer of express or implied warranties, or any limitation
of remedies, contained herein conflicts with applicable law, then such modification, disclaimer or
limitation, as the case may be, shall be deemed to be modified to the extent necessary to comply with
such law.
Y our 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 CARD
Mail the completed WARRANTY REGISTRA TION CARD to:
OR, register online at www.SabinePro.com
NOTE: 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 identification card issued by Sabine, Inc.
IMPORTANCE OF W ARRANTY REGISTRATION CARDS AND NOTIFICATION OF CHANGES
OF ADDRESS
Should notification become necessary for any condition that may require correction, the REGISTRATION CARD, or information submitted using the ONLINE REGISTRATION FORM, will help ensure
that you are contacted and properly notified.
Notice of address changes - If you move from the address shown on the WARRANTY REGISTRATION CARD or ONLINE REGISTRATION FORM, you should notify Sabine of the change of address
so as to facilitate your receipt of any bulletins or other forms of notification 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.
SABINE, INC.
13301 HIGHWAY 441
ALACHUA, FL 32615-8544
MADE IN USA
© 2000 Sabine, Inc.
12
Sabine, Inc.
13301 Highway 441
Alachua, Florida 32615-8544
Phone: (386) 418-2000
Fax: (386) 418-2001
www.Sabine.com
FBX-2020-OpGd-v2.P65
010301 - hto
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