Bss-audio OPAL Series DPR-422 Owner's Manual User Manual

1DPR 422User Manual

105.0 Audio Connections5.1 Main InputsThere are 2 input sockets on the rear panel of the 422, Inputs 1 and 2. Each iselectronically balanced on standa

115.3 Side ChainInputsThe side chain insert inputs are electronically balanced via stereo 5mm jacksockets at an impedance greater than 100k Ohms. The

12Audio Connections5.4 Side ChainOutputsThe side chain uses a quasi-balanced ‘ground compensated’ output. Whenconnected to a balanced input, interfere

136.0 Control Operations6.1 Operating LevelControl Operations6.2 ThresholdGain reduction in the DPR-422 is achieved using a Voltage ControlledAttenuat

14The effect of the ratio control can be shown on a graph which plots input levelagainst output level (see figure 6.1). This clearly shows that below

156.5 ReleaseRelease determines how quickly the compressor returns to normal gainfollowing a transient over the threshold. The setting of the release

16If set too fast, the overall volume level will jump up and down, exactlyfollowing the peaks above threshold, producing an unpleasant effect.If set t

17When linked, the channel 1 below threshold meter shows the combinedchannel 1 & 2 signal. The channel 2 below threshold meter shows only signalso

186.10 De-essThe DE-ESS control determines how much gain reduction the BROADBANDde-esser applies to the signal when a sibilant sound is detected. The

19are used. The setting of these controls should broadly follow the directionsgiven in the respective parts of this manual. The below threshold and ga

2This equipment has been tested and found to comply with the following European andinternational Standards for Electromagnetic Compatibility and Elect

20 7.0 Meter displays7.1 Input MeterThe INPUT METER switch is used in conjunction with the OUTPUT LEVELmeter to allow the input signal to be displaye

217.3 Gain ReductionMeterOnce the input signal has exceeded the threshold point on scale, thecompressor starts to operate, and gain reduction will occ

22The human ear excels in its ability to detect an extremely wide range of soundlevels. These can range from the quietest whisper to the roar of a jet

238.2 Compressorsand LimitersCompressors and limiters have closely related effects, and in general a limiterwill reduce gain very strongly once a cert

24General applications8.3 The effect ofcompression &limiting on soundConsider an input signal which is applied to two units, one having its thresh

25increased. The net effect, therefore, is for both ends of the dynamic spectrum tobe pushed (or squeezed) towards each other. This squeezing effect o

269.0 Operation and applications9.1 CompressionOperations and applications9.2 De-essingThe DPR-422 has two modes of de-essing available, BROADBAND de-

27HF De-essing withfull DynamiccontrolRotate the THRESHOLD control anticlockwise until the BELOW THRESHOLDmeter is fully illuminated and an appropriat

28Troubleshooting10.0 TroubleshootingProblem: No output.Solution: Is the Mains Power connected?Check the connections. See fuse failure (below).Do you

29When 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

3ContentsContents1.0 Mechanical installation 52.0 Mains Power Connection 62.1 Mains Power 63.0 Introduction 74.0 Unpacking 75.0 Audio Connections 105.

3012.0 SpecificationsSpecificationsGeneralInput Impedance 10k ohm balanced or unbalancedInput Headroom >+20dBuInput CMRR >-50dB (30Hz-20kHz)Outp

3113.0 GlossaryActive Active electronic circuits are those which are capable of voltage and powergain by using transistors and integrated circuits.Amp

32presents in the original. Harmonic distortion refers to added frequenciesthat are overtones to the fundamental frequency. Intermodulation distortion

33gain reduce.Transient A sudden burst of energy in an audio signal which only lasts for a small periodof time relative to the rest of the signal. The

34IndexIndexFront Panel 8Fuse rating 6GGain 17Gain control 22Glossary 31IInstallation 5LLimiters 23effects of 24MMechanical installation 5MetersBelow

35TThreshold 13Troubleshooting 28UUnpacking 7VVoltage Controlled Attenuator 13Voltage selection 6WWarranty 29

36User Notes

37

38User Notes

39

4Contents8.0 General Applications 228.1 The need for Gain control 228.2 Compressors and Limiters 238.3 The effect of Compression andLimiting on sound

40User Notes

5Mechanical Installation1.0 Mechanical installationA vertical rack space of 1U (1¾" / 44.5 mm high) is required, with a depth of190mm. Ventilatio

6Mains Power Connection2.0 Mains Power Connection2.1 Mains PowerWARNING! THIS APPLIANCE MUST BE EARTHED.The DPR-422 must always be connected to a 3-wi

73.0 IntroductionThe BSS DPR-422 compressor, de-esser has been designed in response to thedemand for a versatile, cost effective two channel unit whic

8The DPR-422Fig 4.2 Rear PanelFig 4.1 Front Panel

9All numbers in bubbles refer to Section numbers.