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Kirchhoff-EQ: Ultimate EQ plugin with superb dynamic processing and vintage models
Old 3 weeks ago
  #1
Gear Head
 
TBTech Co. Ltd.'s Avatar
 
Software Kirchhoff-EQ: Ultimate EQ plugin with superb dynamic processing and vintage models


Kirchhoff-EQ is an ultimate 32-band parametric EQ plugin built for all critical professional applications. It has refined sound quality, analogue-matched curves, 11 filter types with continuously variable shape and 30 vintage EQ types modelled from realworld devices. The builtin dynamic processing functions are highly flexible and have ultra-low distorsion. All these push Kirchhoff-EQ to a next-generation standard.
Equalizers will never be the same again.

Ultimate Sound Quality
Robust Nyquist-matched Transform
Through originally developed "Robust Nyquist-matched Transform", Kirchhoff-EQ has made digital-domain frequency response more approximate to its analogue counterparts without high frequency cramping as in regular IIR(infinite impulse response) equalizers. This technique is applied on all filter types in Kirchhoff-EQ.

High-Precision Processing
64-bits is mandatory and it's not negotiable. The internal processing of Kirchhoff-EQ is always in 64-bits (or 117-bits), regardless host DAW's current working precision.

Psychoacoustic Adaptive Filter Topologies
All linear filter structures should have same sound on paper. However in real-world application, round-off errors make every filter structure sound differently: some better in low frequency, some better in high frequency.

A technology called "Psychoacoustic Adaptive Filter Topologies" has been deployed in Kirchhoff-EQ. Filter structures change themselves to a "best fitting" state along with corresponding band frequency changes, making optimized sound quality in both low and high frequency.
Click here to know more about how Psychoacoustic Adaptive Filter Topologies works.

Switchable Ultra-High 117-bits Processing
Since there's already 64-bits, why not go further? Kirchhoff-EQ uses a technique called "Double-Double" to make precision of internal processing reach 117 bits! This is the first equalizer in the world to reach such precision. You can switch between 64-bits and 117-bits at any time. It satisfies the most demanding ears.
* Linear-phase mode always use 64-bits as it is an FIR(finite impulse response) filter, and does not support 117-bits.

Filter Types
11 Unique Filter Types
  • low pass, high pass, band pass: continuously variable from 0 dB/oct to 96 dB/oct;
  • bell, notch: continuously variable from 12 dB/oct to 96 dB/oct;
  • low shelf, high shelf, tilt shelf: continuously variable from 6 dB/oct to 96 dB/oct;
  • flat tilt and flat top;
  • sword: has sharper slope than bell, specifically designed to "dig" out resonances.

Continuously variable slopes Filters
The slope of most filter types can be continuously changed from 0 dB/oct, 6 dB/oct or 12 dB/oct up to 96 dB/oct. Would you like to try a 8.125 dB/oct highpass?

30 Filter Types Modeled from Historic Vintage EQs!
Get vintage and modern at same time! We modeled 8 vintage EQ hardware units into Kirchhoff-EQ, in total of 30 EQ types. Benefit from Robust Nyquist-Matched Transform, every EQ type precisely matches the original hardware and won't cramp near Nyquist frequency. For a further step, unlike the original hardware that only allows to choose between several frequency positions, we modified the DSP model to make adjustable frequency points for all these types! Every type in these models can be used together with regular EQ types or other modeled types, and can be applied with dynamic functions (except lowpass and highpass types). This brings you more freedom and convenient operations.
* No non-linear behaviors were modeled. All vintage filter types only contain ideal linear parts of their physical model.

Zero-Latency/Analogue/Linear/Mixed Phase Modes
The phase mode of Kirchhoff-EQ is switchable between zero-latency mode, analogue mode, linear phase mode and mixed phase mode. To meet all your Phase relationship needs.
* No matter which phase mode currently in, if dynamic functions is turned on for a filter band, it will work on minimum-phase mode (won't affect other bands).

Mixed Phase Mode
The zero-latency and linear phase mode has very different sound. Kirchhoff-EQ provides a mixed mode that uses zero-latency when band frequency point is low, and uses linear phase when it is high. Each band could smoothly changed between minimum and linear phase mode according to their frequency.
* There is no noticeable crossover between filter types while in mixed phase mode, transition is seamless.

Flexible Dynamic EQ Functions
Dynamic functions in Kirchhoff-EQ are not just a bonus, They provide the richest functions you have ever seen. Enabling you to achieve unlimited possibilities of dynamic EQ functions. All filter types (except low/high pass, band pass and notch), even these vintage-modelled ones, can be applied with dynamic functions.

Harmonic Shifted Envelope
All dynamic EQ have odd- and non-integral harmonics, that’s the laws of physics. By using advanced DSP techniques, Kirchhoff-EQ now "shift" most energy of odd-harmonics into even-harmonics, making an ultra-low noise floor and enhanced sound. Now you can use dynamic functions with freedom without worrying about smashing your sounds.
Click here to know more about how Harmonic Shifted Envelope Detection works.

Two-Way Threshold
You can now control how dynamics react to the portion of signal above/below threshold concurrently. In Kirchhoff-EQ, the "Above" stage works as a compressor or upward-expander, and the "Below" stage works as an expander or upward-compressor. For example, you can raise the signal below the threshold AND compress the signal above the threshold to "stablize" a band.

Detect/Relative Envelope Detection
Let us imagine a simple case: we are playing an audio clip in which sounds around 1khz are 9 dB. You may think "The 1khz range is over powering, We should reduce the 1khz But we should also consider the overall level. If the whole audio is 30 dB, you would not feel that 1khz is too much, instead you may feel it's not enough. The better criteria to determine whether a band's volume is high or low is its relative portion in overall volume envelope, instead of only its absolute dB value.

Thereby we introduce "Detect/Relative Envelope Detection" in Kirchhoff-EQ. The dynamics are affected by both current frequency band and relative portion to a "Relative" band. The contribution of Relative Envelope Detection to dynamics is also adjustable: when set to 0%, it degrades as a normal dynamic EQ; and when set to 100%, the amount of dynamics is fully calculated from the relative portion.

The “detect” band is set according to the frequency and Q of the band by default, “Relative” is the whole audio envelope by default. But they can be set freely.
The detecting band and relative band have a freely adjustable frequency point and Q value.
Or enable “S.C.” mode to make “Detect” or “Relative” to a sidechain signal.

Onsets Detection Mix
By turning on "Onsets" mix, the envelope detector reacts more specifically to transients inside of the envelope. So you can fine-tune the tone of transients. For better adjustability, you can "mix" envelope detector and onsets detector. For example, you can compress the high frequencies just a little bit whilst compressing the suddent increase of high frequencies more aggressively.

More Details
Spectrum Grab
Kirchhoff-EQ allows you to locate a specific frequency peak rapidly by directly grabbing on spectrum.

Switchable 2x Oversampling
Kirchhoff-EQ has builtin 2x oversampling that can be freely turned on/off.

Per-Band Directional EQ
Each band can be set as mid/side or left/right processing, so you can pan a band Left or right, or adjust Mid/Side, or just left, right, mid and side separately.

Extreme CPU Optimization
Through hand-written assembly code commands, Kirchhoff-EQ achieves ultra low CPU workload. Never fear to use hundreds of instances!

Low Clicking Noise
We made our best to reduce clicking noises while performing parameter changes, type switching, bypass on/off and enter/leave solo listening mode.

GPU Accelerated GUI
We are dedicated to smoothness in oprerating, speed to open/close UI and operation latency. To achieve better rendering efficiency, the GUI of Kirchhoff-EQ is rendered using OpenGL.
Visual-Comfort Spectrometer
The spectrum panel of Kirchhoff-EQ is carefully optimized for visuals and is freely configurable. You can adjust its decibel range, refresh speed, resolution, frequency scaling and brightness. You can even directly specify its center frequency.

User-Customizable Settings
How to trigger a war on forum? Ask them if a Q value shall increse/decrease when mouse wheels up. To help speed-up your workflow, Kirchhoff-EQ provides a rich set of options allowing you to cast it to your own handy tool.

Other Features:
  • solo mode
  • phase invert
  • automatic gain compensation
  • gain scale
  • adjustable spectrum center
  • resizable interface
  • full-screen mode
  • MacOS Retina and Windows high-DPI support
  • piano roll display
  • pre-EQ/post-EQ/both spectrum
  • multi-band selection
  • multiple display ranges: 3dB, 6dB, 12dB, 18dB, 30dB
  • output level meter
  • presets and user-defined defaults
  • undo/redo and A/B switching
  • VST2, VST3, Audio Units, AAX Native (64-bit)

Lantency
 Minimum-Phase: 0.
 Analog Phase: 63 sample points, about 1.4ms (44100Hz sample rate).
 Mix Phase: 63-2047 sample points, depends on band frequency point.
 Linear Phase: 2047, 4095, 8191, 16383, 32767 sample points.

Intro price $109 until 1st Dec, 2021

Kirchhoff-EQ Trial Version
The demo version could not "save&load", and we delete the "silence 5 seconds for each 30 seconds" .

Learn more about Kirchhoff-EQ
Old 3 weeks ago
  #2
Reviews Editor
 
Diogo C's Avatar
Interesting EQ, would like to give it a try but 5 seconds of silence for every 30 seconds of audio seems a bit too much.
Old 3 weeks ago
  #3
Lives for gear
 
alibling's Avatar
 
Looks good. Congrats for the release. I really dont need another eq. Just bought the new sonnox eq. I will still test it
Old 3 weeks ago | Show parent
  #4
Lives for gear
 
alibling's Avatar
 
Quote:
Originally Posted by Diogo C ➡️
Interesting EQ, would like to give it a try but 5 seconds of silence for every 30 seconds of audio seems a bit too much.
Yea thats unfortunately a no go for me.
Old 3 weeks ago | Show parent
  #5
Gear Head
 
TBTech Co. Ltd.'s Avatar
 
Quote:
Originally Posted by Diogo C ➡️
Interesting EQ, would like to give it a try but 5 seconds of silence for every 30 seconds of audio seems a bit too much.
Great suggestion, we will adjust the limitations as soon as possible
Old 3 weeks ago | Show parent
  #6
Reviews Editor
 
Diogo C's Avatar
Quote:
Originally Posted by TBTech Co. Ltd. ➡️
Great suggestion, we will adjust the limitations as soon as possible
That's awesome! Looking forward to it.
Old 3 weeks ago
  #7
Lives for gear
 
engmix's Avatar
This looks like a seriously deep eq and dynamic eq plugin. Good to see companies out there pushing the envelope. And yes, please do take off or lengthen that ridiculous demo-cutoff mode, this is a deal breaker for me. You have a tool here that is intensely deep, and 30 seconds is simply not enough for proper evaluation. I'm definitely going to give this a run around the block and see how it stacks up against the others in the toolbox. I love the idea of this product...hopefully it's not a gimmick. And as for the length of the product description, this is a good thing.
Old 3 weeks ago
  #8
Here for the gear
 
🎧 5 years
Jesus, this looks like one serious eq and if it lives up to the description, I'm sold, but will definitely take it for a test run first. I'm intrigued by "relative envelope detection", and the fact that you can grab the spectrum to carve your eq curves. This could well be a game changer for some. Kudos to whoever wrote the description and congratulations on the release!

PS. Has Dan Worrall certified the robustness of the Nyquist-matched transform?
Old 3 weeks ago
  #9
Gear Nut
 
List price: $189

Intro price: $109

Couldn´t find it in the novel which is the first post, so thought I´d post it here real quick.
Old 3 weeks ago
  #10
Lives for gear
 
denork's Avatar
Admittedly, it looks excellent, it looks very complete, I like all the details that are provided on the website about the functions and their internal processes. I think the most important thing in this type of EQ is the workflow, besides the sound, of course, I will have to try it.
Old 3 weeks ago
  #11
Lives for gear
 
doom64's Avatar
 
1 Review written
🎧 10 years
My interest = piqued. Even though I already have about 59 eq options already! Will this be the one I finally "tie the knot" with?
Old 3 weeks ago | Show parent
  #12
Lives for gear
 
mamm7215's Avatar
 
1 Review written
🎧 15 years
Quote:
Originally Posted by TBTech Co. Ltd. ➡️
Great suggestion, we will adjust the limitations as soon as possible
You should just make it fully featured for 7 or 14 days.
Old 3 weeks ago
  #13
kf.
Here for the gear
 
who is this guy, this plugin is INSANELY well built. I'd pick it up in a second if I hadn't just picked up claro...
Old 3 weeks ago
  #14
Gear Maniac
 
🎧 5 years
Wow! It looks like this developer really knows what he's doing...Really impressive features. I'm looking forward to try it.
Old 3 weeks ago | Show parent
  #15
Lives for gear
 
engmix's Avatar
Quote:
Originally Posted by kf. ➡️
who is this guy, this plugin is INSANELY well built. I'd pick it up in a second if I hadn't just picked up claro...
I also have Claro. I A/B'd them. Matched their parameters, HPF to full spectrum cuts and boosts. They sound different enough that it might be worth having both. I found Claro was more clinical (in a good way) but the Kirchhoff seemed a little punchier (in a good way as well). And then when you start messing with the internal bit depth and phase responses, it goes a step further into sonic differences. Claro has the added A.I. stuff that I have found useful certain tasks. But the added dynamic eq options on the Kirchhoff was a big bonus. And way more so than on FF. You have the added benefit of Ratio, Q, Attack, and Release. Where on FF it's basically threshold and that's it. In a way I think this new offering is more suited to be wondering if it puts FF out to pasture over Claro. On the flip side, I'm honestly suspect of EQ Hardware Modeling that "to me" it's questionable if the added Neve, SSL, and GML/Sontec etc...are just gimmicks. I would like to see the developer chime in on this. How did they come about doing the emulations. Or are they simply inspirations so to speak. Which is all fine and good. The emulations do give you a little bit of a different vibe. But to me it's not like having a Sontec at your fingertips. And this is the case on every emulation I've tried, not just these guys. I own a stereo set of true to schematic GML/Sontec hardware clones, they're not the same, period. But, it's fun to have, but will it feel more like a gimmick versus a serious tool??
Old 3 weeks ago
  #16
Lives for gear
VST3 is only mono in REAPER. Something with the channel routing - can not seem to get stereo signal through it.
Old 3 weeks ago
  #17
Lives for gear
 
b0se's Avatar
 
2 Reviews written
🎧 5 years
Silence/noise is a flow&mojo killer. This looks very promising though, will demo once the restrictions have been updated.
Old 3 weeks ago
  #18
Lives for gear
 
Digital Crush's Avatar
 
🎧 5 years
I don't know if it's a new product placebo, too early to tell, but the Analog filters sound so smooth in the high end and very punchy and well defined in the Lows
Beautiful gui also
Old 3 weeks ago
  #19
Gear Maniac
 
What's the direct link to purchase this? Only see a trial page
Old 3 weeks ago | Show parent
  #20
Here for the gear
 
🎧 5 years
Quote:
Originally Posted by moonark ➡️
What's the direct link to purchase this? Only see a trial page
https://www.threebodytech.com/en/products/kirchhoffeq
Old 3 weeks ago
  #21
Gear Addict
 
The EQ may be good (I don´t know) but the company seems to be one of those "We are suspicious of everyone so we do the sign in process so complicated as possible with Capcha all over the place" and when you succeed in signing in you end up in the user account and there is no way out of there. So you can´t click on a link to gt to the products or something else. The first headline you see is "Chinese Traditional", I wonder if that explains something ...
Old 3 weeks ago | Show parent
  #22
Gear Maniac
 
Thanks, I wonder why there's no direct link in the post and it doesn't specify authorization method.
Old 3 weeks ago | Show parent
  #23
Lives for gear
 
🎧 10 years
Quote:
Originally Posted by moonark ➡️
Thanks, I wonder why there's no direct link in the post and it doesn't specify authorization method.
Yeah, more stuff to the opening post :D But, seriously impressive feature set and load of information!
Old 3 weeks ago | Show parent
  #24
Gear Addict
 
God damn! I thought Claro was the perfect transparent EQ, but this thing actually sounds better. Claro seems a little "grey" in comparison. It´s like those plastic covers used on on displays has been removed.

Ps. I have tested it five minutes so I can´t be certain yet but it looks promising.
Old 3 weeks ago | Show parent
  #25
Here for the gear
 
menzi11's Avatar
 
Quote:
Originally Posted by engmix ➡️
I also have Claro. I A/B'd them. Matched their parameters, HPF to full spectrum cuts and boosts. They sound different enough that it might be worth having both. I found Claro was more clinical (in a good way) but the Kirchhoff seemed a little punchier (in a good way as well). And then when you start messing with the internal bit depth and phase responses, it goes a step further into sonic differences. Claro has the added A.I. stuff that I have found useful certain tasks. But the added dynamic eq options on the Kirchhoff was a big bonus. And way more so than on FF. You have the added benefit of Ratio, Q, Attack, and Release. Where on FF it's basically threshold and that's it. In a way I think this new offering is more suited to be wondering if it puts FF out to pasture over Claro. On the flip side, I'm honestly suspect of EQ Hardware Modeling that "to me" it's questionable if the added Neve, SSL, and GML/Sontec etc...are just gimmicks. I would like to see the developer chime in on this. How did they come about doing the emulations. Or are they simply inspirations so to speak. Which is all fine and good. The emulations do give you a little bit of a different vibe. But to me it's not like having a Sontec at your fingertips. And this is the case on every emulation I've tried, not just these guys. I own a stereo set of true to schematic GML/Sontec hardware clones, they're not the same, period. But, it's fun to have, but will it feel more like a gimmick versus a serious tool??
Hi!

I'm the lead developer of Kirchhoff-EQ, Thank you for all the comments and you are right I think I should write some notes about how circuit modeling works in Kirchhoff-EQ, I will also put it on our website so everyone can see it:

There two methods for circuit modeling. The key is how to treat the distortion of the circuit. If we consider nonlinear things in the circuit, some kind of numerical integration should be used(as many many simulations did). Numerical integration will bring some high-freq cramping(similar to the bilinear transformation used by some EQ), and oversampling is generally used to avoid this problem.

the another way is to treat all circuit devices as linear(as many many simulations did), which is acceptable because the distortion of most EQ hardwares are not much. this way can make us match the lineared protype more better. and do more tricks such as add a dynamic function on.

just to me personally, I like a preamp plugin using numerical integration but don't like a EQ plugin using numerical integration. the reasons are still "round-errors", "high-freq cramping" and "anti-aliasing". but for linear way, sometimes we need those distortions even if they're not much.

So both methods have their own advantages and disadvantages, I totally agree about "every emulation I've tried don't like real gear". My idea is at least in Kirchhoff-EQ, not to do a simulate of distortions, DC Noises.... (since users may already have many of "100%" accurate simulations). Instead, keep it as a EQ, use linear models and with our "Robust Nyquist-matched Transform" and "Psychoacoustic Adaptive Filter Topologies", give users "the tastes" and give max freedom to use all the filter types together to see what will happened. does the vintage models in Kirchhoff-EQ 100% like the real? I can't say that. but in plugin world, I have full confidence in all the vintage models in Kirchhoff-Eq.

Cheers!
Old 3 weeks ago | Show parent
  #26
Here for the gear
 
menzi11's Avatar
 
Quote:
Originally Posted by moonark ➡️
Thanks, I wonder why there's no direct link in the post and it doesn't specify authorization method.
Hi! Kirchhoff-EQ use serial number, no hardware key needed. each serial number could activate Kirchhoff-EQ on two different computers.

and "why there's no direct link".... we just forgot... sorry for that.

https://www.threebodytech.com/en/products/kirchhoffeq
Old 3 weeks ago | Show parent
  #27
Here for the gear
 
menzi11's Avatar
 
Quote:
Originally Posted by kuulart ➡️
VST3 is only mono in REAPER. Something with the channel routing - can not seem to get stereo signal through it.
thanks! I will be fix this bug as soon as possible!
Old 3 weeks ago | Show parent
  #28
Here for the gear
 
menzi11's Avatar
 
Quote:
Originally Posted by MickeUppsala ➡️
The EQ may be good (I don´t know) but the company seems to be one of those "We are suspicious of everyone so we do the sign in process so complicated as possible with Capcha all over the place" and when you succeed in signing in you end up in the user account and there is no way out of there. So you can´t click on a link to gt to the products or something else. The first headline you see is "Chinese Traditional", I wonder if that explains something ...
Hi! Thank you for your advice, we will put links on.
https://www.threebodytech.com/en/products/kirchhoffeq

We indeed like a newcomer in effects world, but we developed many virtual instruments that we are proud of since 2017. including Heavier7Strings: a 7-string virtual guitar plugin with a fully equipped effects rack( will update soon ), and the Chinese traditional series.
Old 3 weeks ago | Show parent
  #29
Gear Addict
 
Quote:
Originally Posted by menzi11 ➡️
Hi! Thank you for your advice, we will put links on.
https://www.threebodytech.com/en/products/kirchhoffeq

We indeed like a newcomer in effects world, but we developed many virtual instruments that we are proud of since 2017. including Heavier7Strings: a 7-string virtual guitar plugin with a fully equipped effects rack( will update soon ), and the Chinese traditional series.
Your homepage is a mess, BUT this EQ is ... the opposite, its perhaps the best in the business!
Old 3 weeks ago
  #30
Lives for gear
 
🎧 10 years
It would be nice to see in the next update
1.Unlinked stereo(Dual mono) in dynamic section
2.Allpass filter
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