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Author Topic: Choosing Sidechain frequencies for the OCL-2  (Read 4339 times)

Viitalahde

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Re: Choosing Sidechain frequencies for the OCL-2
« Reply #15 on: June 18, 2010, 07:22:02 am »

Andrew Hamilton wrote on Fri, 18 June 2010 13:26

Wouldn't that mean that the quality of the s/c-hp filter becomes 2nd order


If the added cutoff was also 15Hz. I'd think that around 50-75Hz it'd look like some sort of a shelving response with rolloff. Above that it starts at 6dB/oct and towards lower frequencies it approaches 12dB/oct. All guessing.


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dcollins

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Re: Choosing Sidechain frequencies for the OCL-2
« Reply #16 on: June 18, 2010, 01:51:16 pm »

Viitalahde wrote on Fri, 18 June 2010 04:22


If the added cutoff was also 15Hz. I'd think that around 50-75Hz it'd look like some sort of a shelving response with rolloff. Above that it starts at 6dB/oct and towards lower frequencies it approaches 12dB/oct. All guessing.



I'll have to look at the schematic again, I think it's 12dB/oct at around 15Hz.

DC

Andrew Hamilton

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Re: Choosing Sidechain frequencies for the OCL-2
« Reply #17 on: June 19, 2010, 02:26:25 am »

So, you're saying that the existing 15 Hz s/c hpfs are not in series with the side chain filters?  ...are buffered in some way from the inserts, but the filtering is still cumulative - just not to the point of affecting the order of the cascaded networks?





Andrew
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dcollins

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Re: Choosing Sidechain frequencies for the OCL-2
« Reply #18 on: June 19, 2010, 12:53:27 pm »

Andrew Hamilton wrote on Fri, 18 June 2010 23:26

So, you're saying that the existing 15 Hz s/c hpfs are not in series with the side chain filters?  ...are buffered in some way from the inserts, but the filtering is still cumulative - just not to the point of affecting the order of the cascaded networks?



There is a side-chain filter built in the OCL-2.  Any external networks are in addition to this.


DC

Andrew Hamilton

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Re: Choosing Sidechain frequencies for the OCL-2
« Reply #19 on: June 21, 2010, 08:32:20 am »

If the on-board s/c filter is not buffered from the side chain insert (TRS) filters one might apply, I wondered if that meant it would result in a single, sharper filter, or if that nascent network is buffered from the TRS ports and, as Viitalahde wrote, therefore the resultant s/c filtering would be in two, different, but concurrent slopes (of non compression)....



Thanks,
    Andrew




P.S., this is the "net" action I was wondering about possibly going on...

index.php/fa/14979/0/



Also, if you have a step on your s/c switch that is open, rather than through a cap or jumper, then the audio will only be passed through the compressor with make-up gain, but no compression...  could be a convenient step for comparisons...
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dcollins

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Re: Choosing Sidechain frequencies for the OCL-2
« Reply #20 on: June 21, 2010, 12:53:53 pm »

Andrew Hamilton wrote on Mon, 21 June 2010 05:32

If the on-board s/c filter is not buffered from the side chain insert (TRS) filters one might apply, I wondered if that meant it would result in a single, sharper filter, or if that nascent network is buffered from the TRS ports and, as Viitalahde wrote, therefore the resultant s/c filtering would be in two, different, but concurrent



The internal filter is buffered.


DC

Alécio Costa - Brazil

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Re: Choosing Sidechain frequencies for the OCL-2
« Reply #21 on: June 27, 2010, 12:01:24 am »

15 Hz only?  ( for free)
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