Operating
Guide
INSIDETHISGUIDE: |
|
About the FBX2020-Plus |
1-2 |
FBX2020-Plus Controls |
3 |
Applications |
4-5 |
Understanding Fixed |
|
& Dynamic Filters |
6 |
Operating Instructions |
6-8 |
Troubleshooting Tips |
8 |
Product Specifications |
9 |
Block Diagram |
9 |
Cautions & Warranty |
10 |
Compliance Information |
11 |
CONGRATULATIONS! You now have the state-of-the-art in feedback control. Your Sabine FBX2020-Plus Dual Feedback Exterminator, a dual-channel, 20-bit digital filtering device that gives you automatic real-time feedback control and increases the clarity and volume of your system.
The FBX2020-Plus 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 FBX2020-Plus:
•The FBX2020-Plus is a dual-channel unit with an improved algorithm that allows it to better distinguish the difference between feedback and music.
•It has improved 20-bit digital resolution, providing superior dynamic range and signal-to-noise ratio.
•The FBX2020-Plus has 12 feedback filters per channel, giving the unit more feedback elimination power for the toughest venues.
•The FBX2020-Plus's new ClipGuard® adaptive clip level control, with TURBO set-up mode, increases the effective dynamic range by more than 10dB and makes set-up faster and easier.
•The FBX2020-Plus now includes a Dynamic Filter Reset option.
•The FBX2020-Plus incorporates an internal power supply.
•Standard FBX features such as lockable fixed filters and switchable 1/10and 1/5-octave constant "Q" filters are also included.
QUICK-START OPERATION
For best results, read all operating instructions before using the FBX2020-Plus. 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 mixer master volume down, put one FBX2020-Plus channel 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. The rest of the filters catch new feedback frequencies throughout the program.
4.Repeat this procedure for the other FBX2020-Plus channel, & you're ready to go.
READ THE ENTIRE OPERATING GUIDE FOR COMPLETE INSTRUCTIONS.
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, German Patent No. 69118486.0, U.K. Patent No. 0486679, Australian Patent No. 653,736, and Canadian Patent No. 2,066,624-2.
ClipGuard™ adaptive clip level control is covered under U.S. Patent No. 5821889. Other patents pending.
© 2003 Sabine, Inc.
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ABOUT THE FBX2020-Plus
A 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.
FREQUENCY RESPONSE: FBX 1/10-Octave Filter Vs. 1/3-
Octave Graphic EQ Filter (12 dB depth; Log Scale).
FREQUENCYRESPONSE:
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.
WORLD'SBESTFEEDBACKCONTROLLER:
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 that the FBX functions automatically, even during the program. Second, the FBX micro-filters are precisely placed while EQ filters are fixed. The difference: FBX filters do not have to be as deep or wide, so there is more system gain. The third 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 FBX2020Plus, 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 THE 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 FBX2020-Plus 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.
2
FBX2020-Plus CONTROLS
FRONTPANEL
ACTIVE/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.
SIGNALLEVEL
The LED ladder indicates the signal strength relative to the FBX's input clip level.
RESET
Press and hold until 'Dynamic Filter'
LEDs go out to reset the dynamic filters. Hold until all LEDs go out to reset all filters. This also automatically places the unit into Turbo mode.
TURBOMODE
Turbo Mode is designed to allow maximum feedback sensitivity for setting fixed filters during setup only. This default setup mode allows the FBX to grab feedback much faster and at a much lower level, making setup faster and quieter. When a channel of the 2020Plus is in Turbo mode, the clip level light flashes. DO NOT ENTER TURBO
MODEDURINGAPERFORMANCE.
SETTOTALNO.
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. This also automatically puts the unit into Turbo mode.
SETFIXED
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.
LOCKFIXEDFILTERS
When the "LOCK FIXED" button is pressed, its LED will light to indicate that the FBX is in "LOCK FIXED"mode. "LOCKFIXED"mode can be activated at any time after system set-up and will stay on until the button is pressed again and the LED turns off.
FIFTHOCTAVE
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.
FILTERSTAGEACTIVITY
When one of the unit’s filters is activated, the corresponding LED lights. A blinking LED indicates the filter that was most recently activated.
POWERSWITCH
The ON/OFF switch is a twoposition push button switch. The power indicator LED will light when the FBX is operational.
BACKPANEL
A/CPOWERINPUT
The FBX2020-Plus 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.
FUSES
This equipment is fitted with an IEC power inlet incorporating a builtin 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 fuses into the holder. Replace only with 5x20mm,
0.315A, 250V F (fast acting) fuses.
4.Refit the fuse cover.
INPUTSANDOUTPUTS
1/4" TRS and XLR balanced and unbalanced.
GROUNDLIFT
Use this switch to choose between grounded or lifted ground.
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3
APPLICATIONS
FBX SET-UP FOR MONITORS:
Mix 1
CHA-OUT CHA-IN |
AMP |
CHB-OUT CHB-IN |
AMP |
|
Mix 2
MIXER
FBX SET-UP FOR ENTIRE MIX:
All other signal processing
equipment
Right Send
CHA-OUT CHA-IN |
AMP |
|
AMP |
CHB-OUT CHB-IN
|
Left Send |
MIXER |
All other |
signal processing equipment
4
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