Manual Compressor DualCom 52
Contents
1. Release time Output Maximum input level Maximum output level Input impedance Output impedance Frequency response Distortion Output hum and noise Power Requirements Measurements Weight Note OdBu 0 775Vms 5dB 21 gt 200s 20ms 100ms 3s to 18dB 23dB 23 20 balanced 1320 servo balanced 20Hz 20kHz 0 2dB lt 0 1 THD OdBu 1kHz 0 1596 THD 15dBu 20Hz 20kHz 96dB 100 240V 50 60Hz 30W 580x4 44x20 3cm 3 6kg 12 13 sinus Importer B amp K Braun GmbH Industriestra e 2 D 76307 Karlsbad www bkbraun com info bkbraun com RoHs EMPANG 13 132. The unit has specific physical electrical and signal requirements for proper operation These requirements will vary depending on your specific application setup and the settings on the unit When setting up and testing your system please take special care to double check all connections and settings Please refer to the specifications section of this manual for specific input output and other figures 5 2 AC Power Your unit equalizer should be connected to standard 3 wire grounded electrical outlet supplying 100 240V 50 60Hz To reduce the risk of ground loop hum connect all audio equipment to the same electrical power source Removal of the ground pin is both unlawful and dangerous as a potential shock hazard could result 8 13 sinus 6 Typical applications The application of this unit can be divided into two basic categories limiting and compressing When used as a protective device it is functioning as a limiter It may also be used to reduce the dynamic range of a signal creating a fuller sounding signal without increasing the loudest peaks in which case it is functioning as a compressor 6 1 The unit as a protective device The unit provides fast an accurate gain control for the prevention of sound system overload due to unexpected transients Sustained distortion caused by amplifiers running out of power or occasional one shot high level overload a microphone falling onto a hardwood floor can damage speakers an
3. Sanga na asas 11 12 SPEGINGANONS uuu 12 2 13 sinus 1 Safety instructions e Read the safety instructions and also this manual carefully e Keep the manual e Observe all red flags e Observe the manual e prevent fire or electric shocks protect the device against rain and humidity e Pull the plug before opening the housing e To prevent an electric shock you should not remove the cover e Do not operate the device in the near of water e Use only adry cloth for cleaning 1 1 FOR SAFE AND EFFICIENT OPERATION Be careful with heat and extreme temperature Avoid exposing it to direct rays of the sun or near a heating appliance Not put it in a temperature bellow 32 F 0 C or exceeding 104 F 35 C To avoid placing on un stable location Select a level and stable location to avoid vibration Do not use chemicals or volatile liquids for cleaning Use a clean dry cloth to wipe off the dust or a wet soft cloth for stubborn dirt Pull the plug before cleaning If out of work contact sales agency immediately Any troubles arose remove the power plug soon and contact with an engineer for repairing do not open the cabinet by yourself it might result a danger of electric shock Take care with the power cable Never pull the power cable to remove the plug from the receptacle be sure to hold the plug When not using the device for an ext
4. of the change in output level to changes in input level for signals above threshold The numbers printed around the ration control are calibrated in dB and indicate the increase input above threshold required to produce increase in output This can be expressed conveniently as a ratio If the output remains constant no matter how high the input level we have an infinite input output ratio It should be remembered that the ratio control has no effect on signals which are below threshold 4 Attack Time The response of the compressor limiter to signal levels above threshold is further defined by the attack time control Attack time is the amount of time that the unit takes to attenuate the output level after threshold has been reached This unit provides continuously variable attack times from 200 us und 20 ms 5 Release Time Release time is the time required to restore system gain to normal after the input signal has fallen below threshold level Proper release time will depend on the type of program material being processed and the way in which the limiter is being used 6 Output Level Output level control is provided to fully cut or restore up to 18dB of system gain For unity gain set the control to 0 6 13 sinus 7 In Out Switch This switch enables you to quickly hear the compressor limiter in or out of the audio chain When the switch is in the OUT position all limiting and compression controls and function
5. to most professional audio products Both inputs and outputs can be used balanced or unbalanced Tip Ring Sleeve Ground AL 83 J Balanced TRS Postive Negative aH Ground Ground 4 3 Negative Positive 24 m m mand ENSE gt p I 22505 Tip Sleeve Ground I q 18 Unbalanced TRS ALA G 6 Input Output LA Formate If you must use unbalanced connectors the negative lead of the connector should be tied to the ground lead Using unbalanced connections could result in chassis ground loop noise Altering the signal chassis ground relationship in equipment connected to your unit may eliminate the noise 5 13 sinus 4 Control Connections 4 1 Front 1 Gain The Gain control adjusts incoming signal level to the VCA circuit It is always active so switching out the limiter function has no effect on this control This control should normally be left at 0 to achieve accurate threshold calibration 2 Treshold The threshold control has a range of 40 to 22dB allowing applications from low level compression to high level limiting The threshold control determines the audio level above which gain reduction occurs When the signal peaks exceed the selected threshold the LED comes on and gain reduction is occurring 3 Ratio This control determines the ratio
6. SIRUS PRO Manual Compressor DualCom 52 1 2 3 4 5 6 7 8 9 sinus Table of contents Safety aka ea aba aa da 3 1 4 FOR SAFE AND EFFICIENT 0 nana 3 ANGGON GUGON 4 2 1 What compressors and limiters 4 4 4 Connectors Gables e 5 Gontfol dada a EKA ANE gerd INI E WA Ka wae maja Kana dak aa 6 4 1 6 4 2 ee sikara nas Q 8 ccu sesa anced 8 5 1 General 8 522 AC POW GM gua ua quas Gan kaa aqa 8 Typical application C 9 6 1 The unit as a protective 0 40 0000 9 6 2 FRO COMMING gana ba ada aa a Aa aa a A pees aab SK a Daha Dy tance co AA aa 9 6 3 Doe 5 T TS 10 6 4 Altering instrument 4 10 6 5 Voice Over Compression 10 6 6 Stereo operation tine r tp aa a ai eae 10 TOUDIGS An an Ka an
7. d other system components The unit can be installed in several locations in a sound system to specific goals Signal path location Effect After the mixer and before the crossover and Compression and limiting acts on the entire amplifier s signal preventing crossover and amplifier overload and maximizing the dynamic performance of both After an active crossover and before the Compression and limiting acts on each segment amplifier s of the signal to which a unit channel is connected coming from the crossover allowing for different setting in each segment After a parametric EQ and before the amplifier s This setup is typically used to control feedback By using the parametric EQ as a multipoint notch filter on the feedback frequencies and the unit to limit those frequencies an accurate and automatic feedback control can be imposed on a system 6 2 Recording The unit limiter can be used to prevent input overload clipping distortion in a live recording environment To prevent distortion while preserving dynamic range set the unit as follows Gain 0 Threshold 2 3dB below recorder input max Ratio 10 Attack 2ms Release 2s Output 0 Every situation is different so experimentation before final recording is always a good idea 9 13 sinus 6 3 De Essing A special type of saturation problem often encountered in recording is the sibilant Ssss sound of the human voice The solution is frequency dependent limitin
8. ended period of time be sure to disconnect the plug from the receptacle Ventilation It is not allowed cover fans and air in and outlets 3 13 sinus Safety Do not remove the grounding It is for your safety If you remove the grounding it can cause electric shocks Hearing To avoid hearing damages you should not operate a sound system with high levels This applies to monitor systems which are in the near of the ear headphones or IEMs also Accessory Please use only the accessory which is set by the manufacturer Important Damages caused by the disregard of this user manual are not subject to warranty The dealer will not accept liability for any resulting defects or problems Make sure the electrical connection is carried out by qualified personnel All electrical and mechanical connections have to be carried out according to the European safety standards 2 Introduction Congratulations on your purchase of the compressor Limiter Te unit was designed to meet the need for universal peak sensitive automatic gain control AGC devices with exceptional audio performance and rugged durability The unit has the following key features e Treshold control e nput output meter with select switch e Balanced XLR connectors e Asingle TRS patch point detector loop e Premium components throughout e Quality construction through computerized automated assembly We are confident that you will be pleased with the high pe
9. g which is easily accomplished with the unit By inserting an equalizer into the detector patch point and boosting the equalizer at high frequencies in the vicinity if the sibilant the limiter s detector circuit becomes more sensitive to this particular range of frequencies and so will limit the bothersome sibilants more than other frequencies 6 4 Altering instrument texture Compression can be used to help bring out a lead vocal or instrumental solo in a cluttered mix The compressor is also a great corrective tool when working with singers whose own dynamic control is less than perfect Experimentation is highly recommended 6 5 Voice Over Compression Ducking The unit can be used to reduce music to a background level when an announcer is speaking The detector is connected to respond only to an announcer s voice 6 6 Stereo operation On the unit pressing the stereo tie switch combines the detector outputs so that the loudest channel controls the limiter action of the other channel This allows true stereo imaging to be preserved regardless of which channel is in gain reduction 10 13 sinus 7 Troubleshooting Situation Action No audio output Check AC power Is the power switch on Check input and output connections are they reserved Are you sure you have an input signal Controls have no effect Is the Limiter in out switch in Perhaps the ratio control is set too low to produce an audible effect or the inpu
10. rformance superb sound quality and reliability that we are known for 2 1 What compressors and limiters do Limiting All musical programs have constant changes in loudness It is the job of a limiter to detect when the volume has exceeded a predetermined maximum safe level and to turn down the volume When the incoming signal returns to its original level the limiter should respond by restoring the gain to normal Thus when the level is within a specified safe range the limiter has no effect When an occasional peak occurs the limiter responds 4 13 sinus Compressing A significant difference in dynamic range is achieved simply by changing the relationship between nominal signal level and threshold as a result of either increasing the GAIN and or decreasing the TRESHOLD control The most interesting effect to be noted however is seen by comparing the original input signal with the output signal The quietest portions of the original signal will be effectively increased in volume while the loudest portions of the original signal will be decreased In effect both ends of the dynamic spectrum will be pushed toward the middle More than anything else it is this double ended effect which distinguishes compressing from limiting 3 Connectors amp Cables The unit has three different connector types 1 4 stereo TRS jacks e 3 Pin XLR e Euroblocks These three connectors facilitate interfacing
11. s are bypassed with the exception of the gain and output controls which continue to function 8 Stereo Tie Switch This switch allows for gain reduction on a stereo signal with no degradation of a stereo image When pressed in the stereo tie switch combines each channel s internal detector outputs so that the channel with the loudest signal will determine the action applied to both channels Leave this switch for normal operation 9 Treshold Gain reduction display As soon as the threshold level is reached the yellow LED illuminates Depending on how far the input level rises above threshold successive red LEDs will illuminate indicating gain reduction Gain reduction can best be described as the difference between input level and the resulting change to output level For signals above threshold output level will increase only to the extent that the ratio control allows 10 Input output meter select While the gain reduction display accurately represents the action of the limiter comparing input to output level in real time is somewhat more intuitive and is made simple using the input output meter select switch The input meter takes its signal just after the gain control and will indicate input signal level regardless of output levels or limiter settings The output meter display takes its signal from the actual output of the unit so every control that affects the output will also have an effect on output meters Use in conjunction
12. t level is below threshold Is the threshold LED lighting up If not lower the threshold setting or increase the gain Do not expect to hear any affect when the input level is below threshold since the unit is simply a linear amplifier at those levels When using heavy compression background Quiet program material is effectively made louder noise is noticeable during quiet section of the while loud peaks are made quieter When the program program source is thus raised in volume its noise floor is also raised in volume by a propionate amount This is not a defect in the compressor limiter but an unavoidable side effect of the gain altering process If the noise becomes a problem the solutions are to either decrease noise at the program source or use less compression Excessive hum or noise Hum is often caused by a ground loop between components Try using the suggested balanced input and output hookup if the other pieces of equipment used in conjunction with the unit have balanced inputs and outputs Make sure you are sending a nominal OdBV line level signal to the unit Unshielded cables improperly wired connections and cable with broken strands shorts etc are the most common problems Make sure you use good quality cable with connectors soldered firmly on the correct pin When in doubt get in touch with your dealer 11 13 sinus 8 Dimensions In inches 9 Specifications Gain Ratio Attack time
13. with the gain reduction meters Input output meters prove to be an extremely useful diagnostic tool when working with system dynamics and level control A unique feature of this compressor limiter is the incorporation of a double release time constant When conventional compressor limiter is adjusted for slow release times transient such as mic pops may cause a severe reduction in gain followed by a slow fade up making the action of the limiter very obvious With the double fine constant release from gain reduction after a brief transient is always fast with a slower release after a sustained overdrive 7 13 Sinus PRO 4 2 Back LE inas Ca 1 oun ro CJ O ki 1 Inputs outputs Your unit Compressor Limiter is provided with three different connector types 14 TRS tip ring sleeve jacks XLR connectors and Euroblocks Inputs are 20kO active balanced using 1 metal film resistors outputs are 1320 servo balanced 2 Detector Loop The Compressor Limiters have a TRS insert DETECTOR PATCH point which can be used as a ducking input or in conjunction with an equalizer to produce frequency sensitive limiting Various uses of the detector patch are discussed under Typical applications 3 Power switch 5 Installation Use four screws and washers when rack mounting the unit For mobile use the unit should be further secured as appropriate 5 1 General requirements
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