ALPHA COMPRESSOR ALPHA COMPRESSOR
10In the middle of the unit, right below the gain reduction meters, there are three buttons to set the distinct operating modes of the alpha compresso
11Link ModeIn link mode, both channels of the alpha compressor can be coupled and operated with the con-trollers and switches of the left control pane
12Stereo CompressionIn order to get a rst impression of the sonic qualities and the control characteristics of the alpha compressor, only the contro
13BASICS – Auto FastAuto Fast (Attack)The Auto Fast function causes an automatic shortening of the attack time on fast and loud signal peaks. This e
14BASICS – Feed Forward & TransformerFeed ForwardThis function makes it possible to switch the junction of the sidechain alternatively behind
15Soft ClipGain ReductionM/S Mode ActiveChannel LinkMixGainEQ FreqHzSC GaindBSC FreqEQ GainAuto FastFeed ForwardOnAuto Fastx10OnTransformerDirectCompr
16BASICS – Sidechain FilterSidechain FilterThe sidechain lter allows frequency-dependent shaping of the compression process by giving specic frequ
17BASICS – Audio FilterAudio FilterThe audio lter is placed behind the compressor in order to avoid unwanted inuences on the detection circuit of
18BASICS – Mix ControllerSoft ClipGain ReductionM/S Mode Active Channel LinkMix GainEQ FreqHzSC GaindBSC FreqEQ GainAuto FastFeed ForwardOnAuto Fast
19Soft ClipGain ReductionM/S ModeActiveChannel LinkMixGainEQ FreqHzSC GaindBSC FreqEQ GainAuto FastFeed ForwardOnAuto Fastx10OnTransformerDirectCompre
2The manufacturer reserves the right to change the contents of this document and/or the associated products at any time without the provision o
20181,53,05,01216201,02,04,06,08,59,511147,51,01,52,01618203,04,05,06,07,58,59,5111214Soft ClipGain ReductionM/S ModeActive Channel LinkMixDir10%20306
21181,53,05,01216201,02,04,06,08,59,511147,51,01,52,01618203,04,05,06,07,58,59,5111214Soft ClipGain ReductionM/S Mode ActiveChannel LinkMixDir10%20306
22181,53,05,01216201,02,04,06,08,59,511147,51,01,52,01618203,04,05,06,07,58,59,5111214Soft ClipGain ReductionM/S Mode ActiveChannel LinkMixDir10%20306
23181,53,05,01216201,02,04,06,08,59,511147,51,01,52,01618203,04,05,06,07,58,59,5111214Soft ClipGain ReductionM/S Mode ActiveChannel LinkMixDir10%20306
24181,53,05,01216201,02,04,06,08,59,511147,51,01,52,01618203,04,05,06,07,58,59,5111214Soft ClipGain ReductionM/S ModeActive Channel LinkMixDir10%20306
25181,53,05,01216201,02,04,06,08,59,511147,51,01,52,01618203,04,05,06,07,58,59,5111214Soft ClipGain ReductionM/S Mode Active Channel LinkMixDir10%2030
26 Threshold OsetThe analog audio level of the alpha compressor depends on the studio environment it is used in. In the ma-jority of cases it depends
27REFERENCE – Attack & Auto Fast AttackAttackHere a burst signal (a sine tone that is boosted by 12 dB for a period of 100 ms) is used to demo
28ReleaseThis gure is based on a very fast attack time; the gain reduction is about -7 dB. The burst lasts for 25 ms and then follows the release ph
29Ratio FeedbackThe alpha compressor works with a soft knee characteristic with rising gain reduction values at increasing ratios. The scale on the
3WARNING: High Voltage• Risk of electric shock.• Do not open chassis.• Refer service to qualied service sta only.• Before connecting the device
30EQ Gain LowFor this measurement the center frequency was set to 1.8 kHz and the EQ gain controller was set to dierent positions between 0 and full
31EQ FrequencyThis diagram shows a variation of center frequencies with the EQ gain controller turned fully clock-wise (HI). The x10 button shifts the
32SC Low PassThis diagram shows some settings of the sidechain frequency controller (SC Freq) in low pass mode (LP). If the lter is set a
33MixThis measurement diagram shows a fade from the original to the compressed signal (direct and compressed buttons active). The gain controller was
34APPENDIX – Level ProblemsLevel ProblemsNo SignalThis problem might be caused by balanced wiring. If the signal almost completely drops when the a
35Technical DataFrequency Response: <10 Hz – 200 kHz (-0.5 dB)THD+N @ +15 dBu, 20 Hz - 22 kHz:Stereo Mode (Direct) 0.0039 %Stereo
36WarrantyConditions and limitationsThe alpha compressor is covered by a limited warranty for a period of 5 years against defects in parts and labor f
37181.53.05.01216201.02.04.06.08.59.511147.51.01.52.01618203.04.05.06.07.58.59.5111214Soft ClipGain ReductionM/S Mode Active Channel LinkMixDir10%2030
38„Let there be sound“And there was sound. (AC/DC)TCHAIKOVSKY‘S NEWS
4Dear friend of audio culture,First of all, we would like to thank you sincerely for choosing the alpha compressor as your new mastering tool. From no
5INDEXBASICS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6ControlsBoth channels of the alpha compressor are absolutely identical regarding their electronic design. Therefore both sides of the front panel hav
7EQ On: activates the Niveau Filter. In the signal path, this special EQ is placed after the com-pressor section, thus it will not inuence this secti
8BASICS – ConnnectorsConnectorsMains moduleThis module combines the line cord connector, the on/o switch, the fuse holder with in-tegrated 230/115
9Getting StartedNever fear! With its many options and quite a lot of controllers the alpha compressor might look a little tricky at rst sight. In pra
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