Behringer DSP110 User Manual

Userss Manual

DSP110

®

ENGLISH

Version 1.2 April 2001

SHARK

www.behringer.com

SHARK DSP110

2

SHARK DSP110

1. INTRODUCTION

Thank you very much for expressing your confidence in BEHRINGER products by
purchasing the SHARK DSP110.

+ This manual first describes the terminology used, so that you can fully

understand the DSP110 and its functions. Please read the manual carefully
and keep it for future reference.

1.1 The concept

With the SHARK DSP110 you purchased a device that combines an automatic Feedback
Destroyer using the ingenious search algorithms of our FEEDBACK
DESTROYERPRO DSP1124P, a variable Delay Line (adjustable in msec, feet and
meter), a ULN (Ultra-Low Noise) microphone pre-amp with Phantom Power, an
automatic Noise Gate, a variable Low Cut filter and a Compressorall in one ultra­rugged and compact case. Still, the SHARK can be operated intuitively and expanded
to a multi-channel system using another four SHARKs and an optionally available 19"
rack mount kit. The SHARKs 24-bit A/D and D/A converters guarantee a precise
reproduction of your program material.

High volume levels and the use of ever more sophisticated monitoring systems with
a multitude of speaker cabinets have led to a greater potential risk of feedback loops
in sound reinforcement systems. So far, audio engineers have been using conventional
1/3-octave equalizers to suppress unwanted feedback. However, the individual filters
of such an EQ, with their relatively wide bandwidth, have quite an impact on the sound
image. With the BEHRINGER SHARK (minimum bandwidth: 1/60 of an octave) you
are now free to either choose the trial and error method to suppress feedback with
graphic equalizers, or to assign this task to the DSP110, so that you can give your
music your undivided attention. Using extremely narrow-bandwidth filters, the
SHARKDSP110 eliminates only unwanted feedback, without affecting your music.

1. INTRODUCTION

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SHARK DSP110

Fig. 1.1: Typical feedback loop

1.2 Before you begin

Your SHARK was carefully packed in the factory and the packaging is designed to
protect the unit from rough handling. Nevertheless, we recommend that you carefully
examine the carton and its contents for any signs of physical damage, which may have
occurred during transit.

+ If the unit is damaged, please do not return it to BEHRINGER, but notify

your dealer and the shipping company immediately, otherwise claims for
damage or replacement may not be granted. Shipping claims must be made
by the consignee.

The optionally available rack mount kit allows you to mount your BEHRINGER SHARK
in a standard 19" rack, together with another four SHARKs. The rack mount kit requires
2U of rack space.

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1. INTRODUCTION

SHARK DSP110

Be sure that there is enough air space around the unit for cooling and please do not
place the SHARK on high-temperature devices such as power amps, etc. to avoid
overheating.

Please use the enclosed power supply to connect the unit to the mains. The supply
complies with all applicable safety standards.

+ 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.

Further information can be found in chapter 3 INSTALLATION.

As a standard the audio inputs and outputs of the BEHRINGER SHARK DSP110 are
fully balanced. If possible, connect the unit to other devices in a balanced configuration
to allow for maximum interference immunity. The automatic servo function detects
unbalanced connections and compensates the level difference automatically (6dB
correction).

1. INTRODUCTION

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SHARK DSP110

1.3 Control elements

Fig. 1.2: Front panel control elements of the DSP110

1

The CLIP LEVEL METER shows you whether or not the digital circuitry is
driven correctly. Any corrections can be made with the CLIP LEVEL control

. Be sure that the CLIP LED wont light up.

2

The CLIP LEVEL control lets you adapt the internal gain optimally to the digital
circuitry. If gain is too high (CLIP LED lights up), raise the CLIP LEVEL value by
turning the control to the right (and vice versa). Thus, you can shift the operating
level upwards/downwards.

+ The CLIP LEVEL control does not affect the input/output levels, but adapts

the audio signal as optimally as possible to the threshold of the digital
circuitry.

3

These five LEDs symbolize the units of the parameters that can be adjusted on
the display

.

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1. INTRODUCTION

SHARK DSP110

4

The 4-digit DISPLAY reads the absolute values of the adjusted parameters.

5

The FB-D FILTER STATUS LEDs display the status of each of the 12 individual
filters. The SHARK uses four different filter modes:

s

Disabled filters (which can be re-enabled with the ACTIVE button). When a
filter is off, its LED is not lit.

Free filters which automatically search for feedback frequencies and whose

s

activity is shown by a flashing LED.

s Set filters which can be reconfigured as free (searching) filters, when all filters

are currently in use.

s

Permanently set filters which must be RESET to be reconfigured as free filters.

Once a filter has been set, its LED lights up.

6

The DELAY button allows you to adjust the Delay Line time. Press the button
several times to either choose msec, feet or meter. The last unit selected will be
stored and recalled next time you use the DELAY function. The control LED
lights up while you are making your entries. The setting range is from 0 to
2,500.0 msec, 0 to 2,818.2 feet, and 0 to 859.00 meters. When you are using
high values, the 4-digit display reads the last figure only when you start editing
with the UP/DOWN buttons. Example: for a value of 1,500.0 msec, the display
reads 1500 when you press the DELAY button, and 500.0 when you start
editing. In this way, you can use extremely small steps when editing parameters.

+ To speed up the selection, briefly press the key located next to the UP or

DOWN key. The selection speed will be increased with each additional key
press. This function can be used for all parameter edits.

7

The DOWN button lowers the parameter values shown in the display .

8

The UP button raises these parameter values.

1. INTRODUCTION

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SHARK DSP110

9

The LOW CUT button lets you enter the high pass filters cut-off frequency
(20 to 150 Hz). When set to OFF the filter is inoperative. The control and Hz
LEDs light up while you are entering a value. Use the UP/DOWN buttons to
edit. Pressing the LOW CUT button for a longer time (please wait, until all
five parameter LEDs light up) enables the keypad lock feature which prevents
inadvertent editing of parameters and settings. When the keypad lock is enabled,
the LOW CUT keys control LED starts flashing.

10

Use the GATE button to adjust the threshold of the internal Noise Gate (-96 dB
through -44 dB). When set to OFF, the Noise Gate is inoperative. The control
LED of the GATE button lights up while you are entering a value. Pressing the
GATE button for a longer time (please wait, until all five parameter LEDs light
up) enables the GATE LEARN function, which automatically sets the Noise
Gate threshold by analyzing the program material and adjusting the value
accordingly (value detected plus 2 dB). In GATE LEARN mode, the GATE keys
control LED starts flashing. As long as the LED flashes, the detected value is
read on the display, when the LED stops flashing, the value is raised by +2 dB.

11

The COMPRESSOR button gives you access to two parameters that let you
adapt the DSP110s Compressor function to the program material. Press the
button once to adjust the DENSITY parameter, which controls the compression
density from 0 (no processing) to 100 (maximum compression). Press the
COMPRESSOR button a second time to adjust the SPEED parameter which
controls the Compressors attack and release times from 10 to 1000 msec. The
msec LED lights up as soon as you select the SPEED parameter.

12

The FILTER key allows you to set the feedback detection sensitivity within a
range from 1 (no sensitivity) through 100 (full sensitivity). The default value is

50. The control LED lights up during data entry. Briefly press the FILTER key a
second time to edit the maximum attenuation of the FB-D filter (from -3 dB
through -48 dB in steps of 3). Pressing the FILTER key longer (please wait, until
all five parameter LEDs light up) activates the FILTER LEARN function, which
automatically searches for feedback frequencies and assigns free filters to the
frequencies found. Now you can enter the number of filters (standard: 9) to be
used for permanent feedback suppression. Although the remaining filters are
also used to eliminate feedback frequencies, they are released once new
feedback occurs. Pressing the FILTER key once again activates the FILTER
LEARN function.

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1. INTRODUCTION