The Sontec MES-432 has a near mythical reputation among mastering engineers. Introduced in 1972, it was created by Burgess Macneal and George Massenburg, and it was the first fully parametric EQ ever available. Beyond its functional utility it is prized for its sound - it is one of those devices that makes things sound better even when its controls are set to flat. In addition, the parameter value choices coupled with the EQ band shapes and overall responsiveness of the device gives the MES-432 a uniquely musical response.





When Make Believe Studios came to us and said that they & Sontec wanted to work with us to make a digital version of the Sontec MES-432D9, we thought, well, if we are going to try to capture the soul of an existing piece of gear, at least it makes sense for it to be a pioneering and legendary mastering EQ.

When we listened to the MES-432D9 that Sontec provided to us, we realized that this device was the source of some of that magical “fairy-dust” that you hear on major releases, and we determined that if we were going to build the digital version of it, it would have to not merely be an emulation, but rather a new Sontec - one that the creator of the original parametric EQ would be happy to associate his name with.

We are happy to say that we have achieved that goal!



“This doesn’t sound like a plug in, this sounds like a Sontec.”
Chris Gehringer
Mastering Engineer
Sterling Sound


“As a Sontec user for over 40 years, this is the real deal!”
Howie Weinberg
Mastering Engineer
Howie Weinberg Mastering






Key Features


  • World-class Signal Processing and Workflow
  • User-Selectable Over-sampling (up to 16x)
  • Faithful recreation of the box tone and filter curves of the Mighty MES Mastering Equalizer
  • EQ features a 3 parametric bands and two shelves, with support for stereo or M/S EQ
  • Bypass per band, per channel, and overall
  • Input and output gain
  • Stepped controls
  • The Sound and Feel of one of the greatest EQs in the history of music recording
  • User-control of some elements of Box-Tone
  • Integrated SpectraFoo analyzer and metering
  • Many presets included
  • Adjustable UI size
  • MH Preset Manager - Provides cross-platform presets

Try It Free for 30 Days

We want you to hear how Sontec MES-432D9D can bring your mixes and masters to the next level – that’s why we have a free, fully functional 30-day trial of Sontec MES-432D9D available for download.

Try the Sontec MES-432D9D for yourself today!

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The +DSP version of this plugin running with zero latency on hardware is included all Metric Halo 3d Audio Interfaces.

Tech Specs

System Requirements

  • Mac OS X 10.10 or newer. Intel Processor or Apple Silicon. AU, VST 2 & 3 or AAX (Pro Tools 11 & newer Native) host. 64 bit.
  • Windows 7 or newer. Intel Processor. VST or AAX (Pro Tools 10, 11 & 12 & Native) host. 64 bit.

Licensing Requirements

  • iLok.com account.
  • License includes two activations for your account.
  • iLok dongle is optional — you may install the license on your machine or on an iLok or the iLok Cloud for portability.
  • Only one license required – works on all supported platforms.

Documentation [PDF]