Mac & 
Win 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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