SABINE FBX2410 User manual

Op e r a t i n g gu i d e
Quick Start Setup on back page
CONTENTS
SECTION ONE — FrONT & BaCk PaNElS 2
1.1. FBX2410 Front Panel Controls & LED Indicators 2
1.2. FBX2410 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 FBX2410 5
SECTION FIVE — HOw TO USE FBX FEaTUrES 6
5.1. Gain 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
SECTION EIGHT — CaUTIONS & warraNTy 10
Dual Feedback Exterminator
FBX2410
MaNUFaCTUrED By
SABINE INC.
alaCHUa, FlOrIDa USa
FBX2410-EN-110516.pmd
©2011 Sabine, Inc.

2
R
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 stays lit. You are now ready to set FBX lters.
2. READY
The READY LED lights continuously when the automatic FBX
setup process has completed. This indicates your unit is ready
for operation. The total number of lters available for feed-
back ltering is 12; in the factory default setting, your unit will
automatically enter READY mode when the 10th 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. At this point the LED ashes indicating the Fixed lters
are unlocked. Press READY again to lock the Fixed lters, and
the LED will light continuously.
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. FBX2410 Front Panel Controls & LED Indicators
9. A/C Power Input
The FBX2410 Series is factory congured 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.
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: 0.06A, 10 W, 0.080 A T 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.
Important: Refer to section 5.2.
13. XLR Output
XLR balanced output.
14. Quarter-inch Input
TRS balanced or TS unbalanced input.
Important: Refer to section 5.2.
15. XLR Input
XLR balanced input.
1.2. FBX2410 Back Panel Controls & Connections
5. RESET DYNAMICS
Press and hold this button until the Dynamic lter ash and
LEDs go off to reset all Dynamic lters.
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.
RED = FBX Fixed, Locked
AMBER = FBX Fixed, Unlocked
GREEN = FBX Dynamic
842
1 3 5 7
6
12 13 12 13 141514 1510119
POWER INPUT
230 VA C 50/60HZ 0.06A 10W

LIT-FBX2410-OP-EN-110516.pmd 3
©2011 Sabine, Inc.
POWER INPUT
230 VA C 50/60HZ 0.06A 10W
POWER INPUT
230 VA C 50/60HZ 0.06A 10W
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 +18dBV peak,
unbalanced +12 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: +14 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: >108 dB
• THD: .005% at 1 KHz
< 0.01% 20 Hz – 10 KHz
< 0.025% 10 KHz – 20 KHz
• DynamicRange: >105 dB
POWER INPUT
• 115 VAC: 100 – 130 VAC 50/60
Hz
• 230 VAC: 200 – 240 VAC 50/60
Hz
FUSE
• 115 VAC, 0.1 A, 10 W, 0.160 A SB
fuse
• 230 VAC, 0.06A, 10 W, 0.080 A T
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
OPERATING TEMPERATURE
• Safe operating temperature: -15 to
+50 degrees centigrade ambient
temperature (5 to 122F)
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
IMPORTANT NOTE
• Usea ¼-inchTRS plug for
balancedsends/inserts.
• Use a ¼-inchTSplugfor
unbalancedsends/inserts.
< 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.
POWER INPUT
230 VA C 50/60HZ 0.06A 10W
POWER INPUT
230 VA C 50/60HZ 0.06A 10W

4
4.1. Before You Begin
Your FBX Feedback Exterminator will improve any sound reinforcement system. The
instructions presume that you are familiar with the fundamentals of sound reinforce-
ment.
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 mode or in Ready 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

LIT-FBX2410-OP-EN-110516.pmd 5
©2011 Sabine, Inc.
4.2. How To Operate your FBX2410
Placeequipment&makeconnections.
a. Patch your FBX2410 into system and make all connections (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stayslit. 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 Setup button until all LEDs stop ashing and the SETUP light ashes on
its own, then press the READY button -- the blue LED ashes indicating the
xed lters are unlocked. Begin your show, and once several xed lters are
set we recommend 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
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 Flash BLUE
Dynamic GREEN Either
FILTER COLOR KEY
FBX Filters LEDs Ready LED