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 Forum index » Clavia Nord Modular » Nord Modular G2 Discussion
"colouring" EQs
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Tim Kleinert



Joined: Mar 12, 2004
Posts: 1038
Location: Zürich, Switzerland
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PostPosted: Sun Sep 11, 2005 3:02 am    Post subject: "colouring" EQs Reply with quote  Mark this post and the followings unread

Many revered EQs (the Pultec comes to mind) colour the signal considerably in what is percieved as a "musical way".

I wondered if there is any way to build such a thing on the G2. The allpass-filter and harmonic distortion stuff discussed lately made me think of this idea.

The problem is: I have neither a clue about how a EQ is actually built, circuitry-wise, nor how these "colourations" come about.

Any takers?

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sheridan



Joined: Jun 05, 2005
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PostPosted: Tue Sep 13, 2005 11:32 am    Post subject: Reply with quote  Mark this post and the followings unread

Hi Tim.

The 'colouring' comes from slight distortion and phase differences in the signal, but very particular ones and I'm afraid that I wouldn't know where to start when recreating them.

Good luck.

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elektro80
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Joined: Mar 25, 2003
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PostPosted: Tue Sep 13, 2005 12:56 pm    Post subject: Reply with quote  Mark this post and the followings unread

I am the happy owner of the UAD-1.

The plugins: http://www.uad-1.com/products/software/UAD-1/index.html

The Cambridge EQ, The Pultec and the Precision EQ are shockingly good.

The Pultec is smooth and warm, almost silky.
http://www.uad-1.com/products/software/UAD-1/pultec-pro/index.html


Posted Image, might have been reduced in size. Click Image to view fullscreen.

One possibly way to find out what these do might be simply to measure what happens to the signal?

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Rob



Joined: Mar 29, 2004
Posts: 580
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PostPosted: Tue Sep 13, 2005 4:11 pm    Post subject: Reply with quote  Mark this post and the followings unread

Hi Tim,

Guess I owe you one. Very Happy

This patch contains a slightly curious sort of EQ. It morphs between a rather broad bandpass with variable width and a rather broad dip. In the middle it is just flat at unity gain. When morphed towards bandpass the low and high get attenuated, and when morphing towards a dip the low and high get boosted. Resonance is possible but at twice the frequency of the dip or peak, which makes it pretty peculiar.

Because the band can be very broad it is not at all like a standard parametric EQ, but not at all like a standard filter either. It can do some strange colourings though, like on reverb or echo. But also subttly boost a broad middle range band to increase presence without much perceived colouration. Which is what I like to use it for.

The nice thing is that the parameters are all modulatable.

Perhaps it is the opposite of what you asked for. Wink


ForTim.pch2
 Description:
A rather curious filter

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 Filename:  ForTim.pch2
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Tim Kleinert



Joined: Mar 12, 2004
Posts: 1038
Location: Zürich, Switzerland
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PostPosted: Tue Sep 13, 2005 5:41 pm    Post subject: Reply with quote  Mark this post and the followings unread

Oh wow, a patch by the master, for ME! Now I feel flattered. Cool

Thanks alot Rob!

This is an interesting design. Will try it tomorrow, perhaps on some audio in. (ain't got a G2 here at home right now...)

The impulse behind this post was the notion that "bigger" doesn't just mean "louder".

Off-the-shelf digital EQs are "perfect" in the sense that they stictly only attenuate the loudness of the frequency bands. This can be good for surgical stuff, but musically it's a different thing. The ear doesn't seem to work like that.

When I boost the bass, I don't just want it louder, I want it bigger. It's hard to explain. But EQs like Pultec or Neve do exactly that.

I wondered if there is any way to build such an EQ from the G2 modules. Maybe it amounts to incorporating some analogue coloring (soft clipping, phase shifting) into the design, some psychoacoustic voodoo stuff.... I don't know if this is possible, or if it even would produce the desired effect. I'm just curious.

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