Even tonal imbalance, resonant peaks/dip
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Mac & Win
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DeFilter is an efficient tool to even out tonal imbalances in a recording or reduce resonant peaks or dips in the frequency spectrum. Even severe issues such as comb filter effects or standing waves from untreated rooms can be addressed. DeFilter can match recordings to target profiles such as music or speech, or alternatively extract the overall timbre from the source – the large strokes – while evening out narrow peaks and dips. The latter removes resonances and comb filter effects effectively while preserving the tonal character of the input signal. Recordings can also be equalized to match a reference recording.


Great care has been taken to provide a user interface that is straightforward to use. Frequency dependent correction levels can be defined using custom curves, so that DeFilter can focus on problematic frequency ranges while leaving other frequency regions untouched. Realtime spectrum analyzers for both the input and output signals visualize the effect on the frequency spectrum.


Use Cases

Fix issues in a mix prior to mastering

Reduce resonances caused by untreated room acoustics

Matched equalization (automatic equalization based on a reference signal)

Improve clarity and intelligibility of speech

Instant fix for nasty comb filter effects

Acon Digital DeFilter is available for both Windows (PC) and OS X (Macintosh). There are 32 and 64 bit versions for Windows and the Mac version is 64 bit. The plug-in formats VST, VST3, AAX and Audio Units (OS X only) are supported.

Platforms and Plugin Formats

Available as VST, VST3 or AAX plug-in on PC (Windows)

Available as VST, VST3, AAX or AU plug-in on Apple Macintosh(OSX)

The Windows is available as native 32 bit or 64 bit versionsand the Mac version is 64 bit

Supports sampling rates up to 96 kHz

Supports surround and immersive multi-channel audio up to7.1.6 channels

Acon Digital DeFilter

Automatically estimates correction filter that evens out thefrequency spectrum

Removes resonances and comb filter effects

Predefined target profiles include music, speech and anautomatic mode that extracts timbre from the input signal

Correction filters can be saved and used as a reference formatched equalization

Adjustable length of the correction filter from 1 to 20milliseconds

Frequency spectrum representation of the of the followingsignals:

Correction filter

Input signal

Output signal

Frequency emphasis filter for the the level of correction

PC Version (Windows)

Windows 7 / 8.x / 10

A host application that is compatible with VST, VST3 (32 bitor 64 bit) or AAX (Pro Tools 11 or higher)

Intel Core i3 or AMD multi-core processor (Intel Core i5 orfaster recommended)

1366 x 768 display resolution (1920 x 1080 or higherrecommended)

1 GB RAM (4 GB or more recommended)

1 GB free HD space

Macintosh Version (OS X)

OS X 10.8 or later

A host application that is compatible with AU, VST, VST3 orAAX (Pro Tools 11 or higher)

1 GB RAM (4 GB or more recommended)

1 GB free HD space

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