KH-EQ1 Product Box


Signature Equalizer

Get ready for the most creative equalization experience you’ve ever had! This one-of-a-kind signature semi-parametric EQ offers five fully adjustable frequency bands, as well as individual harmonic saturation controls for maximum customizability.

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"Love the KH-EQ1 from its expensive, warm and rich sounding bands to its very musical EQ strokes due to the non-destructive proportional Q values. The ability to add additional color per band is as creative as they come! The KH-EQ1 is THE Mercedes of EQ’s!"

Koen Heldens

Producer & Mix Engineer

KH-EQ1 Overview

Equalization & Saturation


The KH-EQ1 is a semi-parametric 5-band EQ like no other. It features rich-sounding frequency band controls that allow you to add color to each band while encouraging creative sound shaping with its musical functionality.

The KH-EQ1 - the second part of the Koen Heldens signature series - is a professional studio EQ with a twist, which features harmonic per-band saturation and our innovative, stepless Mid<->Stereo<->Side router.

Each license includes custom presets created by Koen Heldens himself, giving you the professional studio experience you’ve been waiting for.

The KH-EQ1 Koen Heldens Signature Equalizer is the perfect addition to any producer’s arsenal, and it’s the ideal tool for adding richness and creativity to your productions!

Audio examples


Brief History of the EQ

Creative Signal Shaping

API 550 Equalizer

Photo by Will Fisher

The equalizer, or EQ, is one of the most used yet most misunderstood audio processes out there. It is a vital tool that any producer should have in their toolkit - and yes, it can be an incredibly creative tool!

Simply put, EQing is used to adjust the response of one or more frequencies in an audio signal, which can help shape or make any element of your mix less or more prominent.

The EQ was initially used for telecommunication purposes and dates back to acoustic telegraphy. It was later used in radio and broadcast and continued to evolve until it became a staple in every studio.

Daniel N. Flickinger designed the first parametric equalizer in 1971. His invention achieved filtering circuits that were previously impossible, and his patent introduced circuit topology that continues to be relevant today. These legendary hardware EQs turned into digital EQ plug-ins with countless customization options and styles over the years.

This essential tool allows you to surgically remove or boost any desired frequency, without compromising the timbre of each element, or by changing it completely. The KH-EQ1 is a great example of a highly versatile equalizer that encourages the musical shaping of your sound due to its highly musical functionality.

"If I was ever to be stranded on a deserted island, the KH-EQ1 would be the only EQ I’d ever need"

Koen Heldens

Producer & Mix Engineer
Koen Heldens

About Koen Heldens

Signature Series

The KH-EQ1 is the second part of the Koen Heldens Signature Series, following in the footsteps of the KH-COMP1 Signature Compressor, that has been vowed both by our valued customers and press. Koen Heldens is a multi-platinum selling, American Music Award, and Billboard Music Award-winning mixing engineer and producer, best known for working on the most streamed song in 24 hours with XXXTentacion, among other prominent names in the music industry, such as Trippie Redd, Missy Elliott, and Timbaland.

Koen is the expert when it comes to producing some of the best and most-streamed albums in the hip-hop genre - and while his experience and understanding of music production allow him to create and shape the emotional foundation of a song, he also has a deep understanding of the technical aspects and limitations of each plug-in he holds in his arsenal.

The collaboration between Koen and Black Rooster Audio quickly evolved into a fruitful creative partnership, resulting in a one-of-a-kind plug-in series that is up to the standards of one of the greatest producers of the moment. We are proud to have Koen use our plug-ins extensively in every mix and to have co-created this Signature Series with him.

Plug-In Features

All Black Rooster Audio plug-ins are designed for high-performance and authenticity.


The KH-EQ1 features five fully controllable symmetrical frequency bands between 20Hz and 33kHz, with individual gain controls between -18dB and +18dB. Each band moves independently, allowing for maximum customization.


Add richness to your sound by adding harmonic distortion to each individual frequency band using the saturation dials. This allows for complete control over the distortion without compromising all other frequency bands - perfect for adding that authentic-sounding analog vibe to your productions!


With the Auto Listen function, the gain control automatically solos the changes applied to each band. This makes it much easier to stay in control during your EQing process.


This function allows for M/S cascades or surgical stereo equalization. The stereo input signal is decoded to the middle and side with the possibility of blending them with the original stereo input via the stepless control.


The user interfaces support high pixel density on both Windows and Mac OS systems, giving you the most enjoyable user experience on high DPI displays.

System Requirements

Minimum System Requirements (MAC)
  • SSE2 compatible processor (Intel Core CPU recommended)
  • 1GB of RAM
  • Mac OSX 10.9 or newer
  • VST, AU or AAX compatible host (64bit)
  • Display resolution of 1280x1024 pixels or higher
Minimum System rRequirements (WINDOWS)
  • SSE2 compatible processor (Intel Core CPU recommended)
  • 1GB of RAM
  • Windows 7 or newer
  • VST or AAX compatible host
  • Display resolution of 1280x1024 pixels or higher

Extensive DAW Compatibility

Black Rooster Audio Plug-Ins (AAX/VST/AU) are compatible with all major digital audio workstations (DAW) and many more.

Avid ProTools ProTools
Presonus Studio One Studio One
Steinberg Cubase Cubase
Reaper Reaper
Bitwig Bitwig
Audition Audition
Live Live
Logic Logic
Digital Performer Digital Performer
FL Studio FL Studio

Grab your license

KH-EQ1 Signature Equalizer

KH-EQ1 Product Box

Take your productions to the next level with the help of one of the most knowledgeable producers and mix engineers of the moment with the KH-EQ1!

Not only does this original semi-parametric EQ allow for detailed sound shaping, but it also fuels your creative abilities due to its highly musical functionality.

Get it now for - for a limited time only!

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