Operating instructions

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OPERATING GUIDE

CONGRATULATIONS! You now have the state-of-the-art in feedback control. Your Sabine FBX-1020Plus 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-1020Plus 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 12 Constant Q micro-filters on the resonating frequency and eliminates the feedback in typically less than one second.

Special features of the FBX-1020Plus:

• An improved algorithm that allows the FBX-1020Plus to better distinguish the difference between feedback and music

• Improved 20-bit digital resolution, providing superior dynamic range and signal-to-noise ratio

• 12 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.

• Two stage reset function allows you to reset just dynamic filters or all filters.

• 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.

QUICK-START OPERATION 1

DECLARATION OF CONFORMITY 2

ABOUT THE FBX-1020PLUS 3

FREQUENCY RESPONSE 3

WORLD'S BEST FEEDBACK CONTROLLER 3

WHO N EEDS FBX? 3

WHY THE FBX? 3

DIRECT HIT ON FEEDBACK! 3

ACTIVE/BYPASS SWITCH 4

SIGNAL LEVEL 4

DUAL-FUNCTION RESET 4

SET TOTAL NUMBER OF FILTERS 4

SET FIXED 4

A/C POWER INPUT 4

AUDIO INPUTS & OUTPUTS 4

FBX-1020PLUS CONTROLS 4

LOCK F IXED FILTERS 4

FIFTH OCTAVE 4

FILTER S TAGE ACTIVITY 4

POWER SWITCH 4

FUSE 4

APPLICATION DIAGRAMS 5

FBX SETUP FOR MONITORS 5

FBX S ETUP FOR E NTIRE MIX 5

FBX-1020PLUS OPERATING INSTRUCTIONS 6

WHERE THE FBX FITS IN YOUR SOUND SYSTEM 6

A NOTE ABOUT GRAPHIC EQUALIZERS 6

UNDERSTANDING FIXED & DYNAMIC FILTERS 6

CLIPGUARD™ ADAPTIVE CLIP L EVEL CONTROL 6

CLIPGUARDTM TURBO MODE GUIDE 6

FBX SETUP FOR SINGLE INSERT POINT 7

FBX SETUP FOR INSERT SEND & RETURN 7

HOW T O OPERATE T HE FBX-1020PLUS 7

HOW TO U SE THE FBX-1020PLUS FEATURES 8

USING THE LOCK FIXED FEATURE 8

SELECTING FILTER WIDTH 8

IMPORTANT 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

FREQUENTLY ASKED QUESTIONS 9

INDEX 9

FBX-1020PLUS ENGINEERING SPECIFICATIONS 10

CAUTIONS & WARNINGS 11

LIMITED WARRANTY 12

QUICK-START OPERATION

For best results, read all operating instructions before using the FBX-1020Plus. 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-1020Plus 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.

Click on Section Heading to go to that page

Summary of content (12 pages)

PAGE 1
Click on Section Heading to go to that page QUICK-START OPERATION OPERATING GUIDE V2 1 FBX-1020PLUS OPERATING INSTRUCTIONS 6 DECLARATION OF CONFORMITY 2 ABOUT THE FBX-1020PLUS 3 FREQUENCY RESPONSE WORLD'S BEST FEEDBACK CONTROLLER WHO NEEDS FBX? WHY THE FBX? DIRECT HIT ON FEEDBACK! ACTIVE/BYPASS SWITCH SIGNAL LEVEL DUAL-FUNCTION RESET SET TOTAL NUMBER OF FILTERS SET FIXED A/C P OWER INPUT AUDIO INPUTS & OUTPUTS 3 3 3 3 3 4 4 4 4 4 4 4 FBX-1020PLUS CONTROLS 4 LOCK FIXED FILTERS FIFTH OCTAVE FIL
PAGE 2
DECLARATION OF CONFORMITY Application of Council Directive: 73/23/EEC and 89/336/EEC Standard to which conformity is declared: EN 60065:1993 EN 50082-1:1992 EN 55022 Class B Manufacturer’s Name: Sabine, Inc. Manufacturer’s Address: 13301 Highway 441 Alachua, FL 32615-8544 USA Type of Equipment: Equalizer Model No.: FBX-1020Plus 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.
PAGE 3
ABOUT THE FBX-1020Plus Feedback Frequency FBX filter 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.
PAGE 4
FBX-1020PLUS CONTROLS FBX-1020Plus Front Panel Active/Bypass Switch Lock Fixed Filters 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. When the LOCK FIXED button is pressed, its LED will light to indicate that the FBX is in LOCK FIXED mode.
PAGE 5
APPLICATION DIAGRAMS FBX Setup for Monitors FBX Out FBX IN Amp In Monitor OUT Amplifier FBX Setup for Entire Mix FBX OUT Amp IN Amplifier FBX IN All other Signal Processing Equipment Main OUT 5
PAGE 6
FBX Setup for Single Insert Point FBX Setup for Insert Send & Return FBX-1020Plus OUTPUT & INPUT FBX-1020Plus OUTPUT & INPUT Mixer Input Channel 1/4" phone (tip) 1/4" phone (ring) Mixer Input Channel Low Z Low Z High Z High Z Insert Insert Send TRS connector Insert Return 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.
PAGE 7
How To Operate The FBX-1020Plus ! Read This Follow these steps to obtain the maximum gain before feedback 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.
PAGE 8
How To Use The FBX-1020Plus 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.
PAGE 9
FREQUENTLY ASKED QUESTIONS Q. Can I place the FBX in the mixer’s EQ loop? Q. Why does the FBX cause a noticeable hum? A. 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 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.
PAGE 10
FBX-1020PLUS ENGINEERING SPECIFICATIONS FILTERS THD: <0.01% @ 22 dBV sine wave at 1 KHz 12 independent digital notch filters, controlled automatically from 40 Hz to 20 KHz. Dynamic Range: >105 dB with ClipGuard™ automatic clip level control active Filter width: user-controllable, either 1/10 or 1/5 oct., Constant Q POWER INPUT 1 Resolution: 1/50th Octave Time required to find and eliminate feedback: 0.4 seconds, typical @ 1KHz Factory configured to either 115 VAC or 230 VAC. 50/60 Hz, 12 Watt input.
PAGE 11
CAUTIONS & WARNINGS Warning! 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.
PAGE 12
CAUTION EXPOSURE TO 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.