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Combining the best elements of selected vintage gear into a single plugin, SonEQ is a three band (bass, middle, and treble) digital equalizer with a pre-amp section.


SonEQ is a digital equalizer that takes parts from some vintage gear and combine them in one. SonEQ has 3 bands, bass, middle and treble. Also, SonEQ has a pre-amp section.

  • 3 band Equalizer, Low, Mid, High.
  • 2 Musical Filters, High-Pass Low-Pass.
  • Preamp stage with bass booster.
  • 64-bit floating point precision.
  • Up to 192kHz sample rates supported


SonEQ Pro Specifications:

SonEQ Pro is an enhanced version of SonEQ Free. SonEQ Pro is four-band equalizer inspired by various high-end analog equalizers. We’ve adapted and incorporated the best qualities from these hardware classics into a single cohesive, yet versatile software design. As such, SonEQ Pro aims to serve as a first choice equalizer for mixing engineers of all genres.


  • Refined EQ curves, SonEQ Pro sounds remarkably close to the analog equipment it emulates.
  • Four bands + HP/LP filters.
  • Low-Band Bell Filter Switch. Transforms SonEQ Pro’s low-band into a bell filter upon engagement.
  • High-Cut Control combines a low-pass 6dB/oct with a shelf filter for soft and smooth sounding cuts.
  • High Band, SonEQ Pro's high boost is very soft and silky, great for imparting a natural sense of “air” to an individual instrument or entire mix.
  • Mid Band, this band has a musical sound but it can be very aggressive if required.
  • High-Mid Band, sounds very musical and natural, due to its large bandwidth and smoothly shaped bell.
  • High-pass, while the slope is highly effective for cutting, it's the carefully sculpted attenuation near the slope that makes this filter especially soft and sweet.
  • Low-pass: The low-pass filter is a smooth 12 dB/oct, which combines two 6 dB/oct filters in cascade.
  • SonEQ Pro's pre-amp section is designed to impartsubtle warmth without overt coloration of your mix.
  • Zero latency, no group delay, and careful optimization for low CPU consumption.
  • Internal 64-bit floating point double precision.
  • Hassle-free installation. No activation or serial. Each buyer receives a personalized copy for use in the studio, on the laptop, etc

Supported Platforms

  • VST 32 bits for Windows
  • VST 64 bits for Windows
  • RTAS for Windows
  • VST for MacOs Intel 32/64 bits (Mac OSX 10.5 or above)
  • AU for MacOs Intel 32/64 bits (Mac OSX 10.5 or above)
  • RTAS for Mac OSX Intel (Mac OSX 10.5 or above)

Tech Specs

  • Sample Rate Support: up to 192 khz.
  • Bit Depth: 64 bits (floating point).
  • Channels: Mono and Stereo.
  • Latency: Zero.

In Depth

SonEQ provides musical tonal control with a number of unique curves available. SonEQ is intended for gentle sculpting of sound, not precise surgical correction as one obtains using a parametric EQ. Although frequency and gain values are shown on the SonEQ controls,


These control the input and output levels. These controls, in conjunction with the DRIVE control (see paragraph 7 below), are useful for saturation control − higher level of the INPUT control provides more saturation while the OUTPUT control can be used to compensate the output level.

Output Clip

When the output of SonEQ exceeds 0 dBfs, this LED is switched on. Note: SonEQ does not clip at 0 dBfs because it works internally at 64 bits; but the LED is useful for knowing when the signal has exceeded 0 dBfs which may be helpful if other plug-ins in the signal path cannot accept inputs exceeding 0 dBfs.

High-Pass and Low-Pass

These controls along the bottom edge of the front panel provide very soft and musical filters that assure sonorous quality. When these controls are set to a frequency value, the displayed frequency is the -6dB point of the filter. The LOWPASS filter is a high quality design: it does not become deformed at the Nyquist frequency. You can use these filters boldly because they assure you high quality audio results.

Lows: Boost/Atten

These are unique bass controls that provide boost or attenuation of low frequencies. The BOOST and ATTEN(uate) frequency curves are not perfectly aligned so that it is possible to get useful and surprising effects using both knobs together. The LOW FREQ selector below the BOOST and ATTEN knobs changes how the boost and attenuation filters interact when both controls are used. When only one of the bass controls is used, the control shifts the frequency of boost or attenuation.

Mid Gain Freq

The MID GAIN control knob adjusts the gain of the mid frequency from -12dB to +12dB. The MID FREQ slide control below the GAIN knob adjusts the frequency of the maximum peak or dip from 150 Hz to 4khz. The MID HIGH Q switch along the bottom edge of the front panel controls the bandwidth of mid frequency peak or dip; when this switch is 'on' (LED on) the bandwidth of the filter will narrow.

High Gain/Freq

The HIGH GAIN control knob adjusts the gain of a high frequency shelf filter from approximately -12dB to +12dB. The HIGH FREQ selector control below the GAIN knob adjusts the frequency of the “knee” of the shelf.


Controls saturation and the “bass exciter” feature which adds harmonics to low and mid frequencies without creating harsh high frequency harmonics. You can turn off the bass exciter (DRIVE ON/OFF switch set to off) to operate SonEQ without generating harmonics (“clean” EQ mode) or set the drive control at low values for slight “warmth” to low and mid frequencies.

Note the DRIVE control interacts with the INPUT control in creating more harmonics when both controls are set to high values (both controls set to full clockwise creates the most harmonics). The DRIVE control does not affect the level of the fundamental signal itself so that adjusting DRIVE after INPUT and OUTPUT levels are set will only change the harmonic content of the output signal making it easy to hear the effect without being influenced by a level change.

VU Meter

Displays a visual indication of the distortion amount. Readings from -20 to -10 indicate a soft saturation, which is ideal for buses or softening of an entire mix. From -10 to -4 the effect is more "bold", giving more "edge" to the sound. Readings from -3 to +1 provides stronger saturation with more high harmonic content, but still avoid "breaking up". Use readings over +1 at your own risk!


This control is an “all-pass filter” which generates a phase distortion to create a psycho-acoustic sound-round effect. This is only suitable to be used in a final mix, and should not be used on individual tracks. Using this control incorrectly may cause phase cancellation of some sounds.



The software SonEQ is free, but the author is the owner of
copyright. You can use all functionalities that the software
offers without restrictions, for profit purposes or nonprofit.

You can not distribute SonEQ or make a copy in order to
deliver it to another person. You can not sell, resell or rent
SonEQ. You may not use SonEQ as part of any other product
which could be sold, resold or rented.

SonEQ is provided "as it is", without any warranty. SonEQ
authors are not responsible for any damage caused or by 
incorrect use of this product.

 © Sónimus 2010

If you download Sonimus SonEQ, you are accepting the license.

NOTE: If you want to link SonEQ downloads, always link to this page, never the direct link because they can be modified from time to time.

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