BSS Audio DPR-944 Instrukcja Użytkownika

1DPR 944User Manual

105.0 Audio ConnectionsAudio Connections5.1 Main InputsThere are 2 input sockets on the rear panel of the DPR 944, Inputs 1 and 2.Each is electronical

11Fig 5.45.3 Key InsertBoth the external key input and key send signals are available on a single‘normalising’ TRS jack socket, wired as follows:Fig 5

12Control operationsControl operationsControl operationsControl operationsControl operations6.0 Control Operations - Gate6.1 Gates InWhen the Gates In

13This switch adjusts the width of the internal key filter. This filter should beconsidered as a pair of tracking high pass and low pass filters, with

14In normal use the threshold control is generally set so that wanted signalpeaks are just able to trigger the gate, this gives the maximum protection

156.8 ReleaseThis is a dual mode control, introducing hold as well as release. The hold timeis determined internally to be about 20% of the selected r

166.10 Open/ShutLEDsIf the gate is not passing program, the shut light is illuminated. If it is passingprogram, the open light is illuminated.These li

177.0 General guide to gating7.1 What are gatesfor?Put simply, a noise gate is a device that blocks or switches off a signal, if thatsignal falls belo

18prevent this. They are set up to open only when their particular drum is hit.Unfortunately it is sometimes not easy to set a gate up to only trigger

19• Now gradually rotate the threshold control anti-clockwise. At some positionyou will hear your signal appear - the gate has now ‘opened’. Notice al

2An example of this equipment has been tested and found to comply with the following European andinternational Standards for Electromagnetic Compatibi

20Application examples - Gates8.0 Application examples - GatesEach of the following application examples is accompanied by a front panelcontrol diagra

21Select some music with a heavy beat, set the key filter and filter narrowcontrols so that the beat notes are prominent. When you are happy with thef

22Control operations - Compressor9.0 Control Operations - Parametriccompressor9.1 Comps inWhen the Comps In switch is in the out, non illuminated posi

23In use the threshold and ratio controls are generally adjusted as a pair whilstlistening to the result. The release fast switch also changes the cha

24Fig 9.2 Effect of'Progressive knee'compression9.4 Release fastWith the release fast switch in the out position, the DPR 944 operates in an

259.5 GainAs compression is a gain reducing process, the output signal level will oftenbe less than the input. The gain control is provided to restore

26The centre frequency of the band of interest is selected with the frequencycontrol. Depressing the side chain listen switch makes the operation of t

279.10 Belowthreshold meterThe five LEDs of the below threshold meter give an indication of where theinput signal is in relation to the start of compr

2810.0 General guide to compressing10.1 The need forgain controlThe human ear excels in its ability to detect an extremely wide range ofsound levels.

29noise performance without incurring distortion. This device is called acompressor or limiter, two such devices are provided in the DPR 944.10.2 Comp

3ContentsContents1.0 Mechanical installation 52.0 Unpacking 63.0 Mains Power Connection 63.1 Mains Power 64.0 Introduction 75.0 Audio Connections 105.

3010.3 The effect ofcompression &limiting on soundConsider an input signal which is applied to two units, one having itsthreshold point set 10dB h

31increased. The net effect, therefore, is for both ends of the dynamic spectrumto be pushed (or squeezed) towards each other. This squeezing effect o

3211.0 Application examples - CompressorsEach of the following application examples is accompanied by a front panelcontrol diagram. Controls that are

3311.3 De-essing, De-popping &reducing proximityeffectA common problem encountered when amplifying the human voice is thelarge amount of high freq

34Fig 11.2 Differencebetween Bell and shelfde-essingApplication examples - CompressorsA related problem called ‘popping’, caused by wind from the ‘p’

3511.4 GuitartreatmentA general problem encountered with acoustic guitars is the difference in midrange signal level produced when the guitar is strum

3611.7 Using the sidechain filter as EQThis is an unusual application as it does not use the DPR 944 as a compressor.Each compressor channel of the DP

37When 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

3813.0 SpecificationsSpecificationsGateGeneralInput impedance 10k Ohm balanced or unbalancedInput CMRR >40dB 30Hz-20kHzMain output level >+20dBu

39IndexIndexAApplication examplescompression 32gating 20Attack slow 14Audioconnections 10inputs 10key insert 11outputs 10BBass and treble enhancement

4Contents9.3 Ratio 239.4 Release fast 249.5 Gain 259.6 Side chain listen 259.7 Frequency 259.8 Width 269.9 Stereo link 269.10 Below threshold meter 27

40Key listen 13LLEDBelow threshold meter 27Gain reduction meter 27open/shut 16MMains connection 6OOpen LED 16Outputs 10PPeak limiting 32Proximity effe

41User Notes

42User Notes

5Mechanical Installation1.0 Mechanical installationA vertical rack space of 1U (1 3/4"/44.5mm high) is required, with a depth of190mm, excluding

6Unpacking2.0 UnpackingAs part of the BSS system of quality control, we check every product carefullybefore packing to ensure that it reaches you in f

7IntroductionNote: For USA and Canadian users, the replacement fuse must be of anidentical UL rated type fuse for continued compliance with safety sta

8The DPR 944Fig 4.2 Rear PanelFig 4.1 Front Panel

9All numbers in bubbles refer to Section numbers.