DeFilter by Acon Digital automatic equalization plugin interface

DeFilter: Automatic Equalization Plugin by Acon Digital Free Download

Rated 4.4/5 on Plugin Boutique (95 ratings)

DeFilter is an automatic equalization plugin by Acon Digital that evens out tonal imbalances and reduces resonant peaks and dips in the frequency spectrum. It works on mixes, recordings and speech.

VST3VST2AUAAXWindowsmacOS64-bit

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Free trial available from the developer

01Overview

DeFilter from Acon Digital is an EQ plugin built around automatic correction. Rather than shaping the tone by hand, it estimates a correction filter that flattens uneven parts of the frequency spectrum. The developer says it can address severe problems such as comb filter effects and standing waves caused by untreated rooms. Recordings can be matched to a music or speech target profile, or to a reference recording, so the plugin fits both mixing and recording workflows.

Best for

Fixing mixes before mastering
Reducing room resonances
Matched equalization
Speech clarity and intelligibility
Comb filter correction

Developer: Acon Digital
Category: EQ
Store: Plugin Boutique

02Key features

What you get

Automatically estimates a correction filter that evens out the frequency spectrum
Removes resonances and comb filter effects
Target profiles for music and speech, plus an automatic timbre mode
Saved correction filters can be reused for matched equalization
Adjustable correction filter length from 1 to 20 milliseconds
Real-time spectrum display for input, output and correction filter
Frequency emphasis filter controls the level of correction
Custom curves for frequency-dependent correction levels

03In depth

Automatic correction and target profiles

DeFilter estimates a correction filter that evens out the frequency spectrum of the input. You can choose a predefined target profile for music or speech, or use an automatic mode that extracts the overall timbre from the input signal. Acon Digital describes this mode as keeping the large tonal shape of the source while evening out narrow peaks and dips. The developer says this removes resonances and comb filter effects while preserving the tonal character of the input.

The correction length is adjustable from 1 to 20 milliseconds, and a frequency-emphasis filter controls how strongly the correction is applied.

Controls, custom curves and spectrum views

Correction levels can be defined per frequency with custom curves, so you can target problem ranges and leave other regions untouched. Real-time spectrum displays for the input, the output and the correction filter show the effect on the frequency spectrum as you adjust settings.

Correction filters can be saved and reused as a reference for matched equalization, which lets you apply the same tonal correction to other recordings.

04Specs

Will it run?

Formats, systems and requirements as listed by Plugin Boutique. Missing details are left out, not guessed.

Developer	Acon Digital
Type	Plugin
Category	EQ
Formats	VST3, VST2, AU, AAX
Operating systems	Windows, macOS
Architecture	64-bit
Free trial	Yes

05FAQ

Questions, answered

What formats does DeFilter support?

DeFilter is available in VST3, VST2, AU and AAX formats. It runs on Windows and macOS, in both 32-bit and 64-bit versions on Windows.

What do I need to run DeFilter?

You need a host application compatible with VST, VST3 or AAX (Pro Tools 11 or higher) on Windows, or with AU, VST, VST3 or AAX on macOS. The developer lists at least 1 GB of RAM, with 4 GB or more recommended, and 1 GB of free hard disk space. On Windows, Windows 7, 8.x or 10 is listed; on macOS, OS X 10.9 or later, including macOS 11 Big Sur and Intel or M1 Macs.

Can DeFilter fix room resonances and comb filter effects?

Acon Digital says DeFilter can reduce resonances caused by untreated room acoustics and comb filter effects, including standing waves, while keeping the tonal character of the input.