BSS Audio DPR 404 User Manual Download Page 4 | Manualshive

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Contents

11.0

The effect of Compression on
sound

20

11.1

Compression

20

11.2

Attack, Release and Ratio

21

11.3

De-essing

22

12.0

Specifications

23

13.0

Service Section

25

13.1

Transient suppressor replacement

25

13.2

Separating signal and chassis ground

26

14.0

Warranty Information

27

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Summary of Contents for DPR 404

Page 1: ...1 DPR 404 User Manual ...

Page 2: ...sis via a capacitor to prevent ground loops whilst ensuring good EMC compatibility V3 0 JMK 26 July 1999 We have written this manual with the aim of helping installers sound engineers and musicians alike get to grips with the DPR 404 and obtain its maximum capability If you are new to BSS products we recommend that you begin at the start of the manual If however you are already familiar with the i...

Page 3: ...atio 14 8 4 Attack Release 14 8 5 Below TH meter 14 8 6 Gain reduction meter 14 8 7 De ess 14 8 8 FREQ 14 8 9 Link 15 8 10 Link master LED 15 8 11 Main power fuse 15 9 0 Rear panel controls 16 9 1 Mains voltage selector switch 16 9 2 Mains power switch 16 9 3 Mains voltage selector switch 16 9 4 External side chain insert 16 9 5 Electronically balanced input 16 9 6 Electronically balanced and floa...

Page 4: ...on sound 20 11 1 Compression 20 11 2 Attack Release and Ratio 21 11 3 De essing 22 12 0 Specifications 23 13 0 Service Section 25 13 1 Transient suppressor replacement 25 13 2 Separating signal and chassis ground 26 14 0 Warranty Information 27 ...

Page 5: ...d on each channel of the DPR 404 are 30dB of gain reduction using BSS proprietary subtractive approach Fully adjustable soft knee ratio up to 20 1 hard limit Automatic adjustment of time constants with two user definable ranges Output gain adjustment control with LED clip indicator BSS proprietary activity meter showing below threshold signal level gain reduction and usable range Bypass in out swi...

Page 6: ...is required If the unit is part of a transportable system you must support the unit at it s rear by additional bracing or shelving Failure to do so will impair reliability and invalidate the Warranty Additional threaded M3 screw holes are provided on the rear sides to assist in providing proper support Adequate ventilation must be provided for by allowing sufficient room around the sides and rear ...

Page 7: ...e terminal labelled N or coloured Black or Blue The wire which is coloured Brown must be connected to the terminal labelled L or coloured Red or Brown Those units supplied to the North American market will have an integral moulded 3 pin connector which is provided to satisfy required local standards The mains voltage selector switch provides a simple external adjustment to allow operation on all i...

Page 8: ...ed to and you will have found that spare fuses of this rating are supplied together with your unit and manual It is very unlikely that this fuse will fail during normal use and must be treated with some caution as to the cause if it should do so One of the most likely reasons will be following the incorrect setting of mains voltage switch on the rear panel Another reason can be the inadvertent con...

Page 9: ...9 Power ON This is indicated the green ON LED located under the CH IN switches If this LED is not lit when power is connected and the POWER switch is depressed see section 16 ...

Page 10: ...1 0 Getting to know the DPR 404 Fig 6 1 Front Panel Fig 6 2 Rear Panel ...

Page 11: ...11 All numbers in bubbles refer to Section numbers ...

Page 12: ... use a balanced i e 2 core shielded cable The interconnecting cable should have it s screen grounded by pin 1 of the DPR 404 output the pin 3 output should be connected the unbalanced input 0v ground and the pin 2 output should be connected to the live input There should be no connection between the cable screen and the 0v chassis ground connection of the unbalanced equipment Strict adherence to t...

Page 13: ...the stereo imaging and prevent an audible shift in positioning Channels 1 and 2 plus channels 3 and 4 can be selected to work as linked stereo pairs enabling a stereo program to be successfully processed Selecting the LINK switch on channel 2 or channel 4 re connects the side chain circuitry such that channel 1 or channel 3 now derives the controls voltages for the summed left right program signal...

Page 14: ...en set to out no compression will occur even if signal level is exceeding threshold Sets the operating level at which compression will occur adjustable from 20dBv to 30dBv Signal level in relation to threshold point is shown on the gain reduction meter such that when the TH LED is passed compression will commence 8 2 Gain Output level control used to restore signal after processing providing ÿ 20d...

Page 15: ...level relative to the point at which compression will commence Anticlockwise rotation of the threshold control brings the input signal into the compression window and determines the threshold point The half illuminated orange LED indicates the threshold point above which compression occurs 8 6 Gain reduction meter Shows the amount of gain reduction in dBs being the difference between the input and...

Page 16: ...e esser Control range is from 1kHz to 10kHz allowing precise alignment with sibilant frequencies without affecting other parts of the program signal 8 9 Link When depressed channel one and channel two are linked together to form a stereo pair Channel one becomes the master and controls both the threshold attack release and ratio settings for both channels The control side chain signal is also mono...

Page 17: ...ting 9 0 Rear panel controls Allows operation from 90v 130v or 190v 250v 50 60Hz AC mains voltage 9 1 Mains voltage selector switch 9 2 Mains power switch Turns the unit on off 9 3 Mains voltage selector switch Allows operation from 90V 130V or 190V 250V 50 60Hz AC mains voltage Rear panel controls ...

Page 18: ... as an option 9 4 External side chain insert Offers a line level insertion point on an RTS jack into the control side chain Connections are Ring Signal output from 470 source Tip Return input to 10k Sleeve 0v ground 9 5 Electronically balanced input Maximum input is 20dBu into 10kohms The pin connections are Pin 1 Open circuit no connection Pin 2 Hot Pin 3 Cold Note Transformer balancing is availa...

Page 19: ...ic range of this equipment is its inherent noise floor at the bottom end and the maximum input signal resulting in an acceptable amount of distortion at the upper end See figure 1 2 The usable dynamic range sits in between these two limits and it is common practice to operate a piece of equipment at a level that is somewhat below the upper distortion point leaving a margin of safety for the unexpe...

Page 20: ...a compressor or limiter and is one part of the DPR 404 Compressors and limiters have closely related effects and in general a limiter will reduce gain very strongly once a certain level has been reached whereas a compressor will act gently but over a much wider range of volume levels A limiter will continuously monitor program levels but only commence to reduce gain once the level has exceeded a p...

Page 21: ... particular program envelope and the DPR 404 is provided with two automatic ranges that are designed to carefully optimise these times to the signal With the switches in their released position the times are set to work within a range typical of vocals mix program material and other non transient sources When compressing very fast percussive sounds it is recommended that the fast auto modes are se...

Page 22: ...old applied will be more affected than the other Referring to figures 2 2a b assuming that all other controls on both channels are set identically with gains equalised it is immediately apparent that the signal processed with the higher ratio is said to have been limited whereas the signal with the lower ratio is said to have been compressed Fig 11 1a High threshold level Fig 11 1b Lower threshold...

Page 23: ...changes in input level for all signals that exceed the threshold Returning to section 1 1 where the idea of manual controlling the level of the program was discussed the operator would reach over and turn down the volume if signal levels were approaching distortion At this point he now has an option Either reduce the level so that there is nothing exceeding his desired maximum level or reduce the ...

Page 24: ...lly configured to enable precise selection and control of high frequency sibilance The variable FREQ control tunes not only high pass filters in the controlling side chain but also in the main subtracter so that gain reduction will only affect the high frequencies leaving the rest of the program unprocessed In use the frequency control is adjusted such that the filter is capturing the correct high...

Page 25: ...mal Typically 10 mSecs for 63 recovery from a 10dB 4mSecs overdrive and 1 Sec for 10dB 40 mSec Fast Typically 2 mSecs for 63 recovery from a 10dB 4mSecs overdrive and 300 mSec for 10dB 40 mSec Threshold Range 20dBv to 30dBv continuously variable Ratio 20 1 at and above twice the set frequency Freq Range 1kHz to 10kHz continuously variable Attack times are those as measured to achieve 63 of final g...

Page 26: ...ions are Ring Signal output from 470 ohms source Tip Return input into 10kohms Sleeve 0v ground Power AC 50 60Hz 120v 240v switched externally giving operation range of 90 132v and 180 264v Anchored 2m power cord Size 482 x 44 x 282mm 19 x 1U x 11 10 Weight 4 1kg gross shipping Options Transformer balancing for input and output ...

Page 27: ... will be demonstrated by repeated mains fuse failure at power up Even in this case of extreme over voltage the DPR 504 is protected against failure and the simple removal of the damaged suppressors will allow the unit to be used again It is important however that they are replaced immediately to ensure continued protection Before attempting to remove the damaged suppressors ensure that the unit is...

Page 28: ... this procedure it is recommended that you recheck all audio wiring for correctness Should it be necessary then the simple removal of an internal wire link accomplishes this task Refer to figure 13 2 for the location of this wire link To remove the wire link you will need to remove the top cover of the unit and then remove the top PCB and 4 LED PCBs The chassis link point will then be accessible l...

Page 29: ... has been completed If the unit was purchased witin the European Union you may as an alternative return the unit to any other BSS distributor in the European Union You should include a statement listing the faults found The unit s serial number must be quoted in all correspondence relating to a claim We recommend that you record your purchase information here for future reference Dealer Name Deale...

Page 30: ...Earthing 7 F Front Panel 10 Fuses See Mains Connection G Gain Reduction See Compression meters Gain Reduction Getting to know the DPR 402 10 Grounding See Grounding H Headroom 18 I Installation 6 M Mains Connection 8 Meter Input See Compression meters Meter Input O Output Level See Compression meters Input Level P Power ON See Mains Connection R Rack space See Installation Rear Panel 10 ...

Page 31: ...31 Index Release time 21 S Specifications 23 T Threshold 14 Transient suppressor replacement 25 U Unpacking 6 W Warranty Info 27 ...

Page 32: ...3 2 User Notes ...

Page 33: ...33 User Notes ...

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