BSS Audio DPR 402 Instrukcja Użytkownika

1DPR 402User Manual

10The compressor section allows you full control over all the normal parameters,and offers 'auto' time constants for general purpose use. Th

11Those units supplied to the North American market will have an integralmoulded 3 pin connector which is provided to satisfy required local standards

12Getting to know the DPR-402Fig 6.1 Front PanelFig 6.2 Rear Panel

13All numbers in bubbles refer to Section numbers.

147.0 Mechanical InstallationA vertical rack space of 1U (1¾" / 10½mm) deep is required. Ventilation gapsare unnecessary (See Figure 7.1).If the

158.0 Mains Power ConnectionVoltage: The DPR-402 operates on either 120 or 240 volt supplies. Use thevoltage selector switch to choose the required vo

169.0 Input and Output Connections -Rear Panel Facilities.The input (See figure 9.1) is a 10K ohm balanced type on a standard 3 pinfemale XLR which wi

179.3 Stereo LinkThis facility (See figure 9.4) enables the two channels of the DPR-402 to beused in a stereo system, with the result that there is no

1810.0 Compression ControlsIn the DPR-402, the gain reduction is achieved using a Voltage ControlledAttenuator with a range or operational 'windo

19Fig 10.3 The effect ofRatio on the OutputSignal10.3 Attack TimeThe response of the DPR-402 compressor to signals above the threshold pointis further

2This equipment has been tested and found to comply with the following European Standards forElectromagnetic Compatibility:Emission Specification: EN5

20This feature of the DPR-402 is provided to overcome some of the settlingproblems associated with the attack and release time control features. It is

21The BYPASS switch (See figure 10.8) enables you to bypass quickly allfunctions of the DPR-402 by connecting the output directly to the input. Whenth

2211.0 Compression metersReferring back to section 10.1, where we discussed the VCA window ofoperation, the five LEDs (See figure 11.1) of the BELOW

23The range of the gain reduction meter is set to display the 27dB operatingwindow. In practice, over 30dB of range is available before noticeabledist

24Fig 11.5 METER INPUTswitchThe METER INPUT switch is used in conjunction with the OUTPUT LEVELmeter to allow the input signal to be displayed. The sw

2512.0 De-essing and Peak LimitingIn section 3 the problems with high frequency energy, also known assibilance, were discussed. The DPR-402 provides f

26Fig 12.1b DE-ESSControlsIn utilising the controls in figure 12.1b, no other compressor controls will berequired. If no compression is being used, th

27To aid the correct setting of the FREQ control in relation to the audiblesibilance, the source program can be listened to through the internal de-es

2813.0 Rear Barrier StripThe DPR-402s rear barrier strip provides an interface with the main compressorsection, allowing for various configurations wh

2914.0 Operation and Applications14.1 CompressionBarrier strip linking B-C and D-G (as factory set).ControlsMODE SWITCHTHRESHOLDRATIOATTACKRELEASEGAIN

3ContentsContents1.0 Compressors and Limiters 51.1 The need for Gain Control 51.2 Compressors and Limiters 62.0 The effect of Compressionon sound 72.1

3014.3 De-essingWide withSimultaneousCompressionBarrier strip linking B-C and D-G (as factory set).Rotate the THRESHOLD control anticlockwise until th

3114.5 De-ess HF withFull DynamicControlBarrier strip linking B-C and D-G (as factory set).Initial settings.Controls PositionMODE SWITCHTHRESHOLDRATIO

3215.0 Applications using the Barrier StripControl Side ChainA very common requirement is to make the threshold of the compressorfrequency conscious b

3315.2 Repatching ofthe Barrier Strip forother uses andSpecial EffectsThe following table lists many of the possible uses of the DPR-402. This is nota

34NARROW L.F. CONTROL COMPRESSIONOnly frequencies below that set on the FREQcontrol are compressed. Low frequencies arecompressed without modulating t

35MODE CONTROLS/C LINKSUBTRACTS/C LINKAMPLITUDE CONTROLLED MIXING (2)As above, but the external signal will besummed with the main signal, but this ti

36Fig 15.2 BARRIER STRIPlinking for improvedstereo couplingChannel 1:ControlsSTEREO LINK SWMODE SWITCHTHRESHOLDRATIOATTACKRELEASEGAINDE-ESS THRSHLDFRE

3716.0 TroubleshootingNo OutputProblem:Solution:Fuse FailureProblem:The mains supply fuse is unlikely to blow without an electronic faultbeing present

3817.0 GlossaryAmplitudeRefers to the voltage level or intensity of a signal, and is usually measured involtage or decibels.Active electronic circuits

39dBVAny modification of a signal which produces new frequency components notpresents in the original. Harmonic distortion refers to added frequencies

4Contents12.0 De-essing and Peak Limiting 2512.1 De-essing 2512.2 Broadband De-essing and controls 2512.3 HF Only De-essing and Controls 2612.4 Peak L

40Release TimeSibilanceThresholdTransientUnity GainGlossaryThe time required for a compressor or limiter to restore its gain to normal, afterthe input

4118.0 SpecificationsSpecificationsInput Impedance: 10k ohm balanced or unbalanced.Input Headroom: >+20dBv.Input CMMR: Better than -50dB 30Hz-20kHz

42Peak LimiterThreshold Range: +4dBv to +20dBv continuously variable.Ratio: >20:1.Attack Time: 150 microseconds, fast setting.750 microseconds, slo

43Stereo Switch (Rear Panel): Couples channel 1 and channel 2 control signals for stereooperation. Indicated on the front panel by an LED.Rear Connect

44When sold to an end user by BSS Audio or a BSS Audio Authorised Reseller,this unit is warranted by the seller to the purchaser against defects inwor

45IndexIndexAAttack Time 8, 19Auto Time 20BBelow Threshold. See Compression meters; Compression meters:Below ThresholdBypass switch 21CCompression 7Co

46IndexMMains Connection 15Meter Input. See Compression meters: Meter InputMode switch 21MON S.C. switch 24OOperation 29Compression 29De-essing 29Outp

47User Notes

48User Notes

5The human ear excels in its ability to detect an extremely wide range ofsound levels. These can range from the quietest whisper to the roar of a jeta

6Compressors and LimitersFig 1.2 Operating leveland HeadroomIt therefore becomes apparent that to get the most out of an audio system, thestandard ope

7The effect of Compression2.1 Compression2.0 The effect of Compression on soundConsider an input signal which is applied to two units, one having itst

8The effect of CompressionComparing the input and output waveforms for the compressed mode, theloudest portions of the signal have been effectively de

93.0 De-essing and Peak LimitingA common problem encountered when amplifying the human voice is thelarge amount of High Frequency energy, heard as the