O pe r ati ng with SMARTFILTERS ContentS SECTION ONE -- FrONT & BaCk PaNElS 1.1. FBX2420 Front Panel Controls & LED Indicators 1.2. FBX2420 Back Panel Controls & Connections SECTION TwO -- aPPlICaTIONS 2.1. FBX Setup for Monitors 2.2. FBX Setup for Entire Mix 2.3. FBX Setup for Single Insert Point 2.4. FBX Setup for Insert Send & Return SECTION THrEE -- ENGINEErING SPECIFICaTIONS SECTION FOUr -- OPEraTING INSTrUCTIONS 4.1. Before You Begin 4.2. How To Operate your FBX1220 / FBX2420 SECTION FIVE -- HOw TO USE FBX FEaTUrES 5.1. Input / Output Level Switches 5.2. FBX Filter Control 5.3. Important Operating Considerations SECTION SIX -- TrOUBlESHOOTING TIPS SECTION SEVEN -- FBX THEOry & PraCTICE 7.1. Introduction to FBX 7.2. The Advantages of FBX Filters 7.3. Parametric Filters and FBX 7.4. Who Benefits from FBX? SECTION EIGHT -- CaUTIONS & warraNTy 2 2 2 3 3 3 3 3 3 4 4 5 6 6 6 6 7 8 8 8 9 9 10 Quick Start Setup on back page SeCtIon one -- Front & BaCk PanelS 1.1. FBX2420 Front Panel Controls & leD Indicators 2 4 6 8 Note: FBX1220 front and back panels use the same controls and input/output configuration 1 3 5 7 1. SETUP Press and hold this button to begin the FBX setup mode. Filter LEDs (light emitting diodes) will flash 5 times and the SETUP LED will begin to flash. You are now ready to set FBX filters. 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 filters available for feedback filtering is 12; in the factory default setting, your unit will automatically enter READY mode when the tenth filter is set. Alternatively, you may enter READY status with fewer Fixed FBX filters in place, simply by pressing the READY button at any time. Press READY again to lock the Fixed filters. 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. 5. RESET DYNAMICS & DYNAMIC FILTER TIMER Press and hold this button until the Dynamic filter flash and LEDs go off to reset all Dynamic filters. See Section 5.2.4. for enabling and setting the Dynamic Filter Timer. 6. NUMBER FIXED Set the number of available fixed filters by pressing the NUMBER FIXED button (6) until the LEDs stop flashing, then release it. The LEDs (8) will begin to light in sequence. When the LED corresponding to the desired number of fixed filters lights, press the Number Fixed button to register your selection. 7. 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. 8. FILTER STAGE ACTIVITY When one of the unit's filters is activated, the corresponding LED lights. A blinking LED indicates the filter that was most recently activated. 1.2. FBX2420 Back Panel Controls & Connections 13 13 13 13 9 11 10 12 14 12 14 15 16 15 16 9. A/C Power Input The FBX1220 & FBX2420 Series is factory configured 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 fitted 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. Refit 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 configurations. 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. 2 SeCtIon two -- aPPlICatIonS 2.1. FBX Setup for Monitors Monitor Mix 1 Monitor Mix 2 Ch. B IN Ch. A IN Ch. B OUT Ch. A OUT 2.2. FBX Setup for entire Mix right Main Send left Main Send All other Signal Processing Ch. B OUT Ch. A OUT Ch. B IN Ch. A IN 2.3. FBX Setup for Single Insert Point IMPORTANT NOTE · Mixing balanced and unbalancedconnectionsmayresult ina6dBlossofgain. TS "Y" Connector Ch. 1 < Low Z > < High Z > < Insert > Ch. 2 Ch. B OUT Ch. A OUT Ch. B IN Ch. A IN TS "Y" Connector TRS Connector Y Insert Cords (TRS to TS + TS) TRS Connector 2.4. FBX Setup for Insert Send & return Ch. 1 TS or TRS Connectors Ch. A OUT Ch. A IN Insert > Return < Insert Send IMPORTANT NOTE IMPORTANT NOTE · Use a ¼-inch TRS plug for · Use a ¼-inch TRS plug for balancedsends/inserts. balancedsends/inserts. · Use a ¼-inch TS plug for · Use a ¼-inch TS plug for unbalancedsends/inserts. unbalancedsends/inserts. · Mixing balanced and unbal· Mixing balanced and unbalancedconnectionsmayresult ancedconnectionsmayresult ina6dBlossofgain. ina6dBlossofgain.Refer to section 5.2. Ch. B OUT Ch. B IN Ch. 2 Insert > Return < Insert Send TS or TRS Connectors Tests performed using an Audio Precision System One model 322 or equal. SeCtIon tHree -- enGIneerInG SPeCIFICatIonS FILTERS · 12 independent digital notch filtersperchannel, controlled automatically from 40 Hz to 20 KHz. · Filterwidth: user-controllable - either 1/10 or 1/5 octave*, constant "Q" · Resolution: 1 Hz · Timerequiredtofindandeliminate feedback: 0.4 seconds, typical @ 1 KHz · Number of Dynamic vs. Fixed filters per channel: user selectable. Last configuration stored in memory. *Below approximately 200 Hz the feedback filters become slightly wider to increase the feedback and rumble capture speed at these low frequencies. INPUT/OUTPUT** · Input/Output Maximum Signal Levels: Balanced +27dBV peak, unbalanced +21 dBV peak · Output Drive: Unit will perform as specified driving a load >600 Ohms · InputImpedance: Balanced or unbalanced >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 LIT-FBX1220-1224-OP-EN-080208.pmd - ks 3 © 2008 Sabine, Inc. nominal input, balanced · I/O Connectors: XLR-3 and 1/4" TRS PERFORMANCE*** · Frequencyresponse: 20 Hz ­ 20 KHz +/- 0.3 dB · Gainmatching: +/- 0.2 dB · SpectralVariation: + .25 dB, 20 Hz to 20 KHz · SNR-DynamicRange: >100 dB · THD: .005% at 1 KHz < 0.01% 20 Hz ­ 10 KHz < 0.025% 10 KHz ­ 20 KHz · DynamicRange: >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 FoUr -- oPeratInG InStrUCtIonS 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 -- Applications). 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 beneficial 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 filters: 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 fixed filters; i.e., increasing the number of fixed filters increases the system's gain before feedback. In addition, you can LOCK the fixed filters so they do not get any deeper. Locked fixed filters 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.Formostapplications,theoptimalsetting isnineFIXEDandthreeDYNAMICFILTERS.Thisisthefactorydefault. 4.1.4. Setup & ready Your FBX Feedback Exterminator is either in Setup, Ready, or Bypass mode. SetupMode: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 benefits 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 filters (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 donot talkintothemicsduringsetup, 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 fixed filters are still unlocked (flashing Ready LED). Ready Mode: Let the show begin. Your fixed filters are eliminating feedback and giving you extra gain, and your dynamic filters are ready to jump on any new feedback during the show. In this mode your fixed filters are either locked (red LEDs) or unlocked (amber LEDs). We recommend locking your fixed filters 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 fixed filters. Leaving the fixed filters 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 fixed filters for the duration of the show! 4 4.2. How to operate your FBX1220 / FBX2420 Placeequipment&makeconnections. Followtheseprocedurestogetmaximumgainbeforefeedback 1 a. Patch your FBX1220 or FBX2420 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 qualities, but DO NOT NOTCH FOR FEEDBACK. e. Adjust the level for each mixer channel, and set the sound system's master volume to minimum. Power Tips a. Set up one FBX channel at a time. b. DO NOT TALK INTO YOUR SYSTEM while in Setup mode. c. See Section 5.2. FBX Filter Control for information on: · Changing the number of Fixed vs. Dynamic filters · Selecting and mixing 1/10- & 1/5-octave filters · Enabling and setting the Dy- 2 3 Push SETUP button until all LEDs stop flashing and the SETUP light flashes on its own. Setup mode clears all Fixed & Dynamic filters. Do not use Setup mode during your performance. Slowly raise the gain on the mixer or amp until the FBX eliminatesthefirstfewfeedbacktones. DO NOT TALK INTO THE MICS. The FBX will quickly begin to find and remove feedback. The first Fixed filter 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.Ifyouareusingstationarymicrophones: Continue raising the gain until all filter 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 (performance) mode, with the Fixed filters locked and the b ...