Apex Digital dBC-8 User Manual Download | Manualshive

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Summary of Contents for dBC-8

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Page 3: ... APEX NV Schoebroekstraat 62 3583 Beringen Paal BELGIUM Tel 32 0 11 28 61 91 Fax 32 0 11 25 56 38 email info apex audio be website www apex audio be ...

Page 4: ...hrown away as unsorted municipal waste At the end of life dispose of this product by returning it to the point of sale or to your local municipal collection point for recycling of electric and electronic devices Customer participation is important to minimize the potential affects on the environment and human health that can result from hazardous substances that may be contained in this product Pl...

Page 5: ...r apparatus including amplifiers that produce heat Unplug this apparatus during lightning storms or when unused for long periods of time Stay out of the box To avoid personal injury or worse do not remove the product covers or panels Do not operate the product without the covers and panels properly installed Only use accessories specified by the manufacturer Clean only with a damp cloth Follow all...

Page 6: ...le is intended to alert the user of the presence of uninsulated dangerous voltage within the product s enclosure that may be of sufficient magnitude to constitute a risk of electric shock to persons The exclamation point within an equilateral triangle is intended to alert the user of the presence of important operating and maintenance servicing instructions in the literature accompanying the produ...

Page 7: ...oot of the mean of the sum of the squares of the root mean square Electrical power is proportional to the square of the RMS voltage and acoustic power is pro portional to the square of the RMS sound pressure In more common words this is the mean value compared to the peak or sometimes called program value Attack Time The time it takes for a processor to alter between two states For example in the ...

Page 8: ...T HIGHLIGHTS APPLICATIONS Applications include live sound PA compression on individual instruments to control the dynamics of the audio signal to avoid unexpected peaks or drops in level and to maintain full control over the balance between the different instruments and vocals Recording fitting the dynamics of the acoustic signal to the specifications of the recording media Compression can also be...

Page 9: ...d to the input signal when this signal exceeds the threshold level Variable between 1 1 no compression linear transfer function and 1 or infinity 1 limiting the input level may continue to rise the output level will stay quasi fixed 3 ATTACK variable between 1mseconds and 0 1 seconds This parameters sets the time it will take the compressor to reach full compression as set by the ratio control whe...

Page 10: ...ngs The red LED will indicate that linking is active 7 INPUT METER these these four green LED s will give you an indication of the level present on the input 8 COMPRESSION METER these four red LED s will give you an indication of the amount of compres sion that is applied 1 POWER INLET please connect the supplied power chord to this inlet The power supply of the dBG 8 is auto sensing and accepts b...

Page 11: ... dBC 8 UNLESS you hit the bypass function Bypass will connect the input to the output and sound will pass even when you reverse input and output This may lead you to think that one or more channels of the dBC 8 are malfunctioning So please always verify your connections MIXING CONSOLE UNBALANCED CONNECTION Connection could vary from console manufacturer send return INSERT Most of the time a compre...

Page 12: ...se hum generated by ground loops Connections to the safety earth via the power chord can participate to this hum problem DO NEVER CUT THE EARTHING of equipment which is meant to be earthed In case of persisting hum problems you can try to lift the ground on the dBC 8 respective input s This is done via a jumper on the circuit board Removing this jumper will disconnect the electrical circuit ground...

Page 13: ...should be above 32dB which means the loudest will be around 140dB Goodbye speakers goodbye ears Or let us consider the dynamic range of an analogue cassette 55dB analogue tape 70dB the acclaimed Compact Disc 96dB It is clear that in a number of occasions we cannot fit the dynamic range of the source in the media or equipment So mankind developed equipment to reduce the dynamic range This compressi...

Page 14: ...rs snare drum they all can have large variations in dynamics which are not always intended to be part of the musical expression So what does a compressor exactly do It does NOT reduce the input gain it will reduce the input dynamic range Let s look at drawing nr 1 this shows the dynamic transfer curve of a compressor set with a ratio of 2 1 It clearly shows that an input signal exceeding the thres...

Page 15: ...ompressor If you really want to avoid anything pas sing turn the attack level to a minimum this will keep almost everything except for the very short transients under the threshold level DRAWING 2 So hallelujah You just found the perfect tool to help you mix the band so that you can finish reading that novel during their next concert Well unfortunately there are some drawbacks As you can see in th...

Page 16: ... might work without any problem but by moving all these faders up you increase the gain on all these channels so you are going to approach or exceed the feedback threshold Using compression has a lot of benefits but also has a major drawback you will have to increase the gain after the compression so you increase the existing noise on that channel and you will get closer to feedback in a live situ...

Page 17: ...erformance Also don t forget that there might be songs or passages where some of the musicians play subtle and with low levels The threshold is the function you will adjust the most during set up and even live performance Attack Time This is the time it takes the compressor to achieve 75 of its compression when the input signal exceeds the threshold On a compressor this parameter is closely linked...

Page 18: ...e some very interesting effects Ratio This will determine the amount of compression applied to the input signal when it rises above the threshold A ratio of 2 1 will reduce the dynamic range at the input by 2 when it rises above the threshold So a variation of 10dB at the input will result in a variation of only 5dB at the output Higher ratio settings will give you more compression For normal use ...

Page 19: ...uously variable between 30 dB and 10 dB Ratio Continuously variable from 1 1 to 20 1 limit Attack Continuously variable from 5 mS to 0 5 S Release Continuously variable from 50 mS to 3 S Crosstalk Better than 80 dB THD 0 dB 0 05 20 Hz 20 kHz Frequency response 0 5 dB 20 Hz 20 kHz Metering Input level meter gain reduction meter Power supply Auto detect 110 230 V 50 60 Hz switching power supply powe...

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