BEHRINGER DSP1100P - Manuals

5 E 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 this unit.It is one of my most pleasant tasks to write this letter to you, because it is the culmination of many months of hard w...

6 TABLE OF CONTENT 1. INTRODUCTION ..................................................................................................................... 7 1.1 The design concept ......................................................................................................................... ...

7 E 1. INTRODUCTION With the FEEDBACK DESTROYER PRO you have purchased 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 FEEDBACK DESTROYER PRO not only suppresses feedback but als...

8 Electrostatic charges might affect the operation of the FEEDBACK DESTROYER PRO! For further information on correct installation see chapter 5 “Installation”.As a standard the audio inputs and outputs on the BEHRINGER FEEDBACK DESTROYER PRO are fully balanced. If possible, connect the unit to other...

12 2.1 Activating/deactivating the filters In “OF” mode, the corresponding filter is deactivated and can be activated by selecting one of the modes described below. 2.2 Manual filters / parametric equalizer The FEEDBACK DESTROYER PRO allows you to freely process any music signals. To raise or lower ...

13 E only after about one second, which is indicated by a dot in the lower right corner of the display. After loading the data, the FEEDBACK DESTROYER PRO enables the preset and the dot disappears. This brief interruption avoids the direct activation of every preset, as you scroll through the preset...

16 3.1 Level setting Take care to set levels properly on the FEEDBACK DESTROYER PRO! Low levels deteriorate the dynamics of the music signal, which results in a poor, weak and noisy sound. On the other hand, excess levels overdriving the converters in the FEEDBACK DESTROYER PRO should also be avoide...

17 E situations.Before applying the FEEDBACK DESTROYER PRO, it is therefore advisable to remove the condition causing the feedback problems. For example, try different microphone positions! Use the FEEDBACK DESTROYER PRO in the monitor path and in single channels with critical signals. If there is n...

18 3.4 Using the FEEDBACK DESTROYER PRO in single channels and sub-groups Master Out P.A. System Sub-Group Insert Channel Insert Fig. 3.3: Inserting the FEEDBACK DESTROYER PRO in single channels and sub-groups If you want to make sure that deliberately produced feedback signals, such as “guitar feed...

19 E 3.7 Special remarks 3.7.1 Digital overflow When using the FEEDBACK DESTROYER PRO as a parametric equalizer (Parametric EQ mode) and applying extreme attenuation values in the low end range of the frequency spectrum (below 50 Hz), you should perhaps set several filters to process the same freque...

20 The range of sound pressure levels or the dynamic range of human hearing encompasses a factor of 10,000,000. This enormous range of values is difficult to handle and additionally does not represent the subjective perception of sound, since human hearing tends to use a logarithmic curve. When an i...

21 E 0 dB -2 dB -4 dB -6 dB -8 dB -10 dB -12 dB 1 kHz 5 kHz 200 Hz Bandwidth = 600 Hz Filter attenuated by 8 dB at 1kHz Center frequency = 1 kHz -3 dB Fig. 4.2: Typical equalizer filter curve The filter bandwidth can also be expressed in octaves (as on the FEEDBACK DESTROYER PRO). The following tabl...

22 Microphone Mixing Console Power Amp Speaker Box Fig. 4.3: Typical feedback loop Basically, any microphone signal passing through an amplifier is liable to generate feedback. Unfortunately, the feedback frequencies of P.A. systems differ, and even one single system can have varying feedback freque...

23 E Of course, you can use the FINE button to fine tune to frequencies between the standard ISO frequencies (in 1/60-octave steps) within a range of 1/3 octave. Hz 20 25 31,5 40 50 63 80 100 125 160 200 250 315 400 500 630 800 kHz 1 1,25 1,6 2 2,5 3,15 4 5 6,3 8 10 12,5 16 20 Tab. 4.2: standard ISO...

24 s Quick filter settings can be realized by using standard ISO values for the allocation of frequency bands. Subsequently, you can fine tune the frequency of your choice. 4.5 Digital audio processing In order to convert an analog signal - e.g. music - into a series of digital words, a so-called “A...

26 does not comply, then it is necessary to switch the operating voltage to the correct supply requirements BEFORE turning on the unit, otherwise the unit could be severely damaged. You will find this combined fuse holder/voltage selector at the back, adjacent to the IEC receptacle. IMPORTANT: This ...

27 E Unbalanced use ofmono 1/4" jack plugs Ring Balanced use ofstereo 1/4" jack plugs Balanced use with XLR connectors 1 2 3 2 1 3 Input Output Tip =Signal Tip =hot (+ve) Sleeve =Ground / Shield Sleeve =Ground / Shield Tip Tip Sleeve Sleeve Strain relief clamp Strain relief clamp Ring =cold ...

28 5.5 Operating level Switch To adapt the FEEDBACK DESTROYER PRO to the used operating level, the unit can be switched between homerecording level (-10 dBV) and professional level (+4 dBu). Use the LED bars on the frontpanel to deter- mine the optimal setting. The Level indicators should read somew...

30 6.3 MIDI implementation Parameter Name Display Range Midi Control Number Control Value Range LEDs Couple Left Right IN on IN off IN flashing Filter Select 1..12 10 0..11 Filter Mode OF, PA, AU, SI 11 0..3 Engine 12 0,1,2 0 1 2 Frequency 20 (Hz)..20 (kHz) 13 0..30 Fine (1/60 Oct) -9..+10 14 0..19 ...