Version 1.0 February 2001 ® FEEDBACK DESTROYER PRO www.behringer.com DATA-MANFULL_DSP1124P_ENG_Rev. A.p651 02.03.
FEEDBACK DESTROYER PRO DSP1124P SAFETY INSTRUCTIONS CAUTION: To reduce the risk of electrical shock, do not remove the cover (or back). No user serviceable parts inside; refer servicing to qualified personnel. WARNING: To reduce the risk of fire or electrical shock, do not expose this appliance to rain or moisture. This symbol, wherever it appears, alerts you to the presence of uninsulated dangerous voltage inside the enclosure - voltage that may be sufficient to constitute a risk of shock.
FEEDBACK DESTROYER PRO DSP1124P FOREWORD Dear Customer, Welcome to the team of FEEDBACK DESTROYER PRO users and thank you very much for expressing your confidence in BEHRINGER products by purchasing the DSP1124P. It is one of my most pleasant tasks to write this letter to you, because it is the culmination of many months of hard work delivered by our engineering team to reach a very ambitious goal: making an outstanding and extremely flexible device for studios and P.A. rental companies better still.
FEEDBACK DESTROYER PRO DSP1124P FEEDBACK DESTROYER® PRO 24-Bit Dual Engine Digital Feedback Destroyer / Parametric EQ Model DSP1124P DSP1124P s Ultra-high performance 2-channel digital Feedback Destroyer / parametric EQ powered by a 24-bit high-speed DSP s 24-bit A/D and D/A converters with 64/128 times oversampling for ultra-high headroom and resolution s Automatically and intelligently searches out and destroys up to 12 frequencies per channel s 24 fully programmable parametric filters that can be se
FEEDBACK DESTROYER PRO DSP1124P TABLE OF CONTENTS 1. INTRODUCTION .....................................................................................................................6 1.1 The design concept ......................................................................................................................... 6 1.2 Before you begin ............................................................................................................................. 6 1.
FEEDBACK DESTROYER PRO DSP1124P 1. INTRODUCTION Thank you very much for expressing your confidence in BEHRINGER products by purchasing the FEEDBACK DESTROYER PRO DSP1124P. With the FEEDBACK DESTROYER PRO you have acquired a highly useful device for the control of sound reinforcement systems, which will enable you to focus your attention on what is essential: your music. The fully featured DSP1124P not only suppresses feedback but also incorporates a wealth of additional functions in one single unit.
+ FEEDBACK DESTROYER PRO DSP1124P Please note that all units must be grounded properly. For your own safety, you should never remove any ground connectors from electrical devices or power cords or render them inoperative. As a standard, the BEHRINGER FEEDBACK DESTROYER PRO is equipped with electronically servo-balanced inputs and outputs. The circuit design features automatic hum and noise reduction for balanced signals and thus allows for trouble-free operation, even at high operating levels.
FEEDBACK DESTROYER PRO DSP1124P 2. APPLICATIONS The DSP1124P is used exclusively to eliminate feedback in FOH and monitor mixes. Before you go on, please note the following two remarks: + + The FEEDBACK DESTROYER PRO is not intended to be connected directly to the microphones! If this is unavoidable, then we recommend our proven BEHRINGER SHARK DSP110 instead, which is equipped with a dedicated microphone preamplifier.
FEEDBACK DESTROYER PRO DSP1124P Fig. 2.1: Using the DSP1124P in the monitor sends 2.3 Using the FEEDBACK DESTROYER PRO in the FOH mix Since you want to make sure that deliberately produced feedback signals, such as guitar feedback, are not eliminated, you should try inserting the DSP1124P into those channels that are susceptible to feedback. For example, you could process a vocal microphone that is liable to produce feedback by connecting the DSP1124P to the insert points of the respective channel.
FEEDBACK DESTROYER PRO DSP1124P 2.4 Using the FEEDBACK DESTROYER PRO in a studio environment With its highly flexible configuration the DSP1124P also delivers good results in a professional studio or home recording environment, as it provides a maximum of 12 fully parametric equalizers per channel in Parametric EQ mode. Thus, you can realize any application ranging from slight processing to the total manipulation of music signals.
FEEDBACK DESTROYER PRO DSP1124P s A filter has been set, i.e. it is already suppressing feedback; or: s A filter is set to Parametric EQ mode (gain ¹ 0 dB). Cyclically flashing LEDs signal that a filter is searching feedback frequencies in Single-Shot or Auto mode (see chapters 5 and 6.3). Inactive filters (OF) and filters in Parametric EQ mode (see 6.2), with a gain setting of 0 dB, are indicated by unlit LEDs. 3 The LED DISPLAY consists of a clearly visible, two-digit numeric display.
FEEDBACK DESTROYER PRO DSP1124P 13 The GAIN key sets the desired boost/cut of the selected filter in dB (+16 dB/-48 dB). 14 The IN/OUT key allows for optional bypassing of the parametric filters or all filters. By shortly pressing the IN/OUT key, only the Parametric EQ filters will be deactivated, and the green LED goes out. Hold down the key for about two seconds to deactivate all filters. This Total Bypass mode is indicated by the cyclic flashing of the green LED.
FEEDBACK DESTROYER PRO DSP1124P 5. DSP1124P ARCHITECTURE: PRESETS, FILTERS, OPERATING MODES In order to avoid confusion, let us give you a concise description of the DSP1124Ps operating principle, so as to make the three relevant points clear right from the start. Example: You have set up your P.A. system and connected all signal sources to the console. The DSP1124P has been inserted into the monitor path (see fig. 2.1) or in single channel or sub-group inserts (see fig. 2.
FEEDBACK DESTROYER PRO DSP1124P 6. OPERATING MODES OF THE DSP1124P The individual filters on the BEHRINGER FEEDBACK DESTROYER PRO can operate in four different modes (see ). An additional mode called Locked mode will be described specifically. Basically, each of the 2 x 12 filters on the DSP1124P can be set to any of the four operating modes. To meet more complex requirements with regard to flexible signal processing, these modes can be combined in a program and stored in a preset. 6.
FEEDBACK DESTROYER PRO DSP1124P 6.4 Locked mode (LO) When the DSP1124P detects a feedback frequency in Single-Shot mode (see chapter 6.3), it automatically enters Locked mode, i.e. the filter locks to the trouble frequency and keeps an eye on it. To unlock such a filter, you need to switch it back to Single-Shot mode (see and chapter 7.2). 7. WORKING WITH PRESETS In order to store your favorite settings, the DSP1124P has ten user presets and one default preset.
+ + FEEDBACK DESTROYER PRO DSP1124P To avoid inadvertent changing of filter modes, the filter mode selection takes place after about one second, which is indicated by a dot in the lower right corner of the DISPLAY. Press the FILTER MODE and GAIN keys at the same time, and use the JOG WHEEL to adjust the feedback threshold (= feedback sensitivity) within a range from -3 to -9 dB. 7.
FEEDBACK DESTROYER PRO DSP1124P 8. PROBLEMS DO HAVE A CAUSE ... Feedback is one of the major problems encountered in live P.A. applications. In a worst-case scenario every microphone signal passing an amplifier can cause feedback. Still, theres a lot you can do even before the show begins: s Place the microphones at some distance to the FOH and monitor speakers. s Make sure that the levels of the microphone channels are adjusted correctly (see users manual of your console).
FEEDBACK DESTROYER PRO DSP1124P The fifth page of the MIDI menu shows the Store Enable flag represented by a capital S in the DISPLAY. Available values are 0 and 1. If set to 1, the FEEDBACK DESTROYER PRO receives controller 18 as a direct save command, i.e. the current settings will be stored without further confirmation in the preset number that corresponds to this controller value. If set to 0, the DSP1124P ignores all incoming commands referring to controller 18.
FEEDBACK DESTROYER PRO DSP1124P Fig. 10.1: Different plug types Fig. 10.2: Wiring an insert cable + Please ensure that only qualified persons install and operate the FEEDBACK DESTROYER PRO. During installation and operation the user must have sufficient electrical contact to earth. Electrostatic charges might affect the operation of the unit. 10.INSTALLATION DATA-MANFULL_DSP1124P_ENG_Rev. A.p6519 19 02.03.
FEEDBACK DESTROYER PRO DSP1124P 10.2 MIDI connections The MIDI connectors found on the rear panel are on internationally standardized 5-pin DIN jacks. You need dedicated MIDI cables to connect the FEEDBACK DESTROYER PRO to other MIDI equipment. Normally, complete cables will be purchased for this use, but you can also make your own, using a high-quality two-conductor shielded cables (e.g.
FEEDBACK DESTROYER PRO DSP1124P increment Hz kHz 20 1 25 31.5 40 1.25 1.6 2 ∆ fn = 50 63 80 2.5 3.15 4 (f n +1 − fn ) 20 100 125 160 200 250 315 400 500 630 800 5 6.3 8 10 12.5 16 20 Tab. 11.2: Standard ISO frequencies 11.
FEEDBACK DESTROYER PRO DSP1124P 11.3 MIDI implementation Function Transmitted Recognized Remark s Basic Channel Default Changed Default Messages Altered Mode Note Number Velocity After Touch True Voice Note ON Note OFF Key´s Ch´s OFF, 1 - 16 OFF, 1 - 16 1,2,3,4 X X X X X X X X X O 10 - 19 O (0-9) 1-10 O X X X X X X X X X Pitch Bender Control Progr.
FEEDBACK DESTROYER PRO DSP1124P 12. SPECIFICATIONS AUDIO INPUTS Connectors Type Impedance Nominal Operating Level Max. Input Level XLR and 1/4" TRS RF filtered, servo-balanced input 60 kOhms balanced, 30 kOhms unbalanced -10 dBV to +4dBu (switchable) +16 dBu at +4 dB nominal level, +2 dBV at -10 dBV nominal level AUDIO OUTPUTS Connectors Type Impedance Max.
FEEDBACK DESTROYER PRO DSP1124P 13. WARRANTY § 1 WARRANTY CARD/ONLINE REGISTRATION To be protected by the extended warranty, the buyer must complete and return the enclosed warranty card within 14 days of the date of purchase to BEHRINGER Spezielle Studiotechnik GmbH, in accordance with the conditions stipulated in § 3. Failure to return the card in due time (date as per postmark) will void any extended warranty claims.
FEDERAL COMMUNICATIONS COMMISSION COMPLIANCE INFORMATION FEEDBACK DESTROYER PRO DSP1124P Responsible party name: MUSIC Group Services USA, Inc. Address: 18912 North Creek Parkway, Suite 200 Bothell, WA 98011, USA Phone/Fax No.
