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compression limiting distortion and tresholds.
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Elad
Tsabeat/Sattel Battle
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Posted : Apr 25, 2006 10:56
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this is directly after analog thread was locked, but still some Q's in my mind.
when we left there we saw 2 diffrent types of compression , one made sine wav to get square in its high end , what meens distorted .
now , is volume reduction is all compressor should do ? without touching the actual wavform ?
does the distortion should come only when limiting ?
and why the hell i use c1 with treshold of -9db , having sine wav in -10db , render and the wav become -13.8 db ? i think it wasnt supose to work if it didnt reach the tresh point ?
please be mature (u know who) to not get this locked its very intresting debate.
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PoM
IsraTrance Full Member
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162
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8087
Posted : Apr 25, 2006 12:02
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i m not a expert but with fast attack and release the compressor ll begin to modify the waveform.if you overdrive the input or output you ll have some distortion too.i use transparent compression , i dont think i have the choice with plugins  |
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TopDown
Started Topics :
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62
Posted : Apr 26, 2006 11:36
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Simple compressor (without colouring) should only reduce gain of the signal above threshold (gettin to its full reduction acording to attack and leaving it alone after the decay time).
That C1 "paradox" you mentioned (reducing gain of a signal below threshold) is caused, I think by the knee character. It compresses signal below threshold just a little and its rate will increase gettin closer to it (threshold). |
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5Meo-Geo
IsraTrance Junior Member
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Posted : Apr 26, 2006 12:56
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"knee" acts only arround the point of tresh and sometimes up also
even with soft knee, bit below the treshold, compressor supose to act like its bypassed but defenetly not reduce gain from -inf
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bit background
Jesus didnt dance,but his beat goes on
http://www.myspace.com/5me0ge0
PSYCHEDELIC-ZION |
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Colin OOOD
Moderator
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Posted : Apr 26, 2006 17:56
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5Meo-Geo
IsraTrance Junior Member
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515
Posted : Apr 26, 2006 18:31
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colin i mean that if ur tresh is at -5dB then -20 dB input should be out at -20dB aswell (if makeup at 0 dB)
Jesus didnt dance,but his beat goes on
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PSYCHEDELIC-ZION |
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UnderTow
Started Topics :
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1448
Posted : Apr 26, 2006 18:48
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Quote:
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On 2006-04-26 18:31, 5Meo-Geo wrote:
colin i mean that if ur tresh is at -5dB then -20 dB input should be out at -20dB aswell (if makeup at 0 dB)
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The C1 compressor has a soft-knee characteristic. It has a dynamic curve that starts below the threshold and approaches the actual ratio as the signal gets higher above the threshold. (20-30 dB above the threshold according to the manual).
You should really read the C1 manual where all this is explained.
But more importantly, in the DBX266 example that you posted, the sine wave was clipped somehwere before it reached the compressor. That was what was giving the distorted waveform.
UnderTow
PS: All analogue compressors are soft-knee to a certain degree as it is impossible to build electronic components that behave exactly like mathematical models. |
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orange
Fat Data
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154
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3918
Posted : Apr 26, 2006 19:12
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interesting!
when i compress a kick thats reaches -8db using sonalksis sv-315 compressor and puting the threshold to -4 or any other setting before the -8db my kick is getting slightly louder but if i set it more then -8db something like -10/-12db it gets even louder(atack 10ms release 251ms knee 12db but even if i turn knee off its still louder) and the auto gain is turned off! all this occur in all the kicks/basses different settings though but same reaction by the compressor!
the c-1 example buzzed me too some time ago and dispite the very audible volume drop down it also made the kick very thin!
dunno if this is a difference in the code/behaviour of the plugs but i find that most of the compressors reduce the volume but not sonalksis! also sound remains much rounder and fuller with sonalksis the squashing efect doesnt occur so much!
orange
http://www.landmark-recordings.com/
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UnderTow
Started Topics :
9
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1448
Posted : Apr 26, 2006 21:16
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Sounds like the Sonalksis does some gain even when the autogain is off! Or maybe it has a dry/wet setting? (Parallel compression).
This gain could explain why the Sonalksis sounds fuller (which would be cheating!). Research has shown that differences of 0.1dB can be perceived as better and fuller sounding.
Does the manual shed any light on this? I havn't used the Sonalksis compressor so I can't make any informed comment on what it might be doing.
UnderTow
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