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Author Topic: Choosing Sidechain frequencies for the OCL-2  (Read 4334 times)

Alécio Costa - Brazil

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Choosing Sidechain frequencies for the OCL-2
« on: June 05, 2010, 05:50:57 pm »

Hi, folks

Which are the most used side chain frequencies you guys select for the Pendulum OCL2?

I intend to build a small box, so it is time to thing about frequency selection...

I was thinking of :
1 - 40
2 - 60
3 - 90
4 - 120
5 - 150

There was a thread at GS where something like 320 was also chosen. Seems a bit high, right?

Thanks

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Alécio Costa Studio
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Andrew Hamilton

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Re: Choosing Sidechain frequencies for the OCL-2
« Reply #1 on: June 07, 2010, 03:58:43 am »

Bom dia, Al
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Alécio Costa - Brazil

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Re: Choosing Sidechain frequencies for the OCL-2
« Reply #2 on: June 08, 2010, 01:20:05 am »

Thanks, Andrew!
BTW I used to be an electrical engineeer
LOL
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Alécio Costa Studio
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Alécio Costa - Brazil

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Re: Choosing Sidechain frequencies for the OCL-2
« Reply #3 on: June 08, 2010, 01:24:20 am »

p.s: If you come to Brazil, drop me a call and I may take you to visit some of the 43 beaches we have here!

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Alécio Costa Studio
High-end Mastering, Music Production
http://www.aleciocosta.com

Listen to my album at:
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Andrew Hamilton

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Re: Choosing Sidechain frequencies for the OCL-2
« Reply #4 on: June 08, 2010, 11:30:08 am »

I'll let you know if I make it there.  Thanks.  By the way, I meant to say that the frequency column in my list contained the _non_-integers, and the capacitance column, the integers...

Memristically, yours,







Andrew
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Alécio Costa - Brazil

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Re: Choosing Sidechain frequencies for the OCL-2
« Reply #5 on: June 10, 2010, 09:32:25 am »

Cool
Let us Keep In contaqct!
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Alécio Costa Studio
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The Buzz

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Re: Choosing Sidechain frequencies for the OCL-2
« Reply #6 on: June 13, 2010, 02:22:25 am »

From listening experience, changing a HPF in the side chain of a compressor has to be quite radical to notice any real change.  If the filter is only a 6dB slope, then yes, starting roll off at 300Hz is not as silly as it sounds.  The thread you mention might have been about the Atlas compressor I designed, which has such a filter in the sidechain.  But if the filter has a steeper slope then lower cutoff freq's will work.

Tim

Alécio Costa - Brazil

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Re: Choosing Sidechain frequencies for the OCL-2
« Reply #7 on: June 16, 2010, 12:23:20 am »

Interesting, Tim.
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Alécio Costa Studio
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bblackwood

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Re: Choosing Sidechain frequencies for the OCL-2
« Reply #8 on: June 16, 2010, 12:45:28 am »

Honestly, while one would think the lower freqs were too subtle, I find myself using all five selections on mine with some regularity. The one thing I'll likely do is add a '2x' switch to the side to make higher freqs available.

But yah, I find even the lower freqs useful.

http://www.euphonicmasters.com/misc/OCL2_SC_HPF.JPG
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Brad Blackwood
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Viitalahde

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Re: Choosing Sidechain frequencies for the OCL-2
« Reply #9 on: June 16, 2010, 06:12:25 am »

Yeah, my Knif compressor has SC cutoffs at 30, 50, 70, 100, 150 and I often find myself using 50 and 70, sometimes the upper ones.

Brad: I think that 2x switch could be done by putting a toggle switch at the output, shunting a resistor equal to the input Z of the OCL2 to ground. 10k?
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Jaakko Viitalähde
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bblackwood

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Re: Choosing Sidechain frequencies for the OCL-2
« Reply #10 on: June 16, 2010, 08:51:16 am »

Viitalahde wrote on Wed, 16 June 2010 05:12

Brad: I think that 2x switch could be done by putting a toggle switch at the output, shunting a resistor equal to the input Z of the OCL2 to ground. 10k?

Yah, that's what I'm thinking. Should be a simple 'mod', and making some even higher freqs available can't hurt.
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Brad Blackwood
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Alécio Costa - Brazil

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Re: Choosing Sidechain frequencies for the OCL-2
« Reply #11 on: June 17, 2010, 01:30:58 am »

Brad, are your filters 6dB/octave, 12...?

Have you felt the need to go  into the low mid area with the side chain frequencies? (300 for example)
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Alécio Costa Studio
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Listen to my album at:
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bblackwood

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Re: Choosing Sidechain frequencies for the OCL-2
« Reply #12 on: June 17, 2010, 08:31:54 am »

Al
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Brad Blackwood
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dcollins

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Re: Choosing Sidechain frequencies for the OCL-2
« Reply #13 on: June 17, 2010, 01:50:28 pm »

I guess it's worth mentioning that the OCL-2 has a 15Hz S/C filter internally so any external rolloffs are in addition to this.


DC

Andrew Hamilton

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Re: Choosing Sidechain frequencies for the OCL-2
« Reply #14 on: June 18, 2010, 06:26:55 am »

dcollins wrote on Thu, 17 June 2010 13:50

I guess it's worth mentioning that the OCL-2 has a 15Hz S/C filter internally so any external rolloffs are in addition to this.


DC


Wouldn't that mean that the quality of the s/c-hp filter becomes 2nd order (when using the Blackwood mod - or even swappable TRS connectors with caps soldered on, for those s/c inserts)?   If so, then perhaps the Buzz would object less to the notion of the efficacy of selectable low end corner frequencies for the side chain.







Andrew
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