[FREE] LoudnessCompensator v1.0.0 - ISO 226:2003 Equal Loudness Compensation Plugin

[grisys]

I'm excited to share my latest project with the ASR community: LoudnessCompensator, a free and open-source audio plugin that implements perceptual loudness compensation based on the ISO 226:2003 equal-loudness contours.

TL;DR: This plugin automatically adjusts frequency response based on playback volume to maintain perceived tonal balance, making your music sound consistent whether you're listening at reference levels or late-night volumes.
Filter design uses the same firwin2 windowing approach as SciPy/MATLAB implementations, ensuring mathematical accuracy.

• GitHub Release: https://github.com/grisys83/LoudnessCompensator/releases/tag/v1.0.0
• Full Source Code: https://github.com/grisys83/LoudnessCompensator
• License: AGPLv3
• Documentation: Comprehensive README with technical details

Installation (macOS)​

1. Download LoudnessCompensator-v1.0.0-macOS.zip
2. Extract and copy:
- LoudnessCompensator.component → ~/Library/Audio/Plug-Ins/Components/
- LoudnessCompensator.vst3 → ~/Library/Audio/Plug-Ins/VST3/
3. Restart your DAW and rescan plugins

Installation (Windows)​

1. Download LoudnessCompensator-v1.0.0-macOS.zip
2. Extract and copy:
- LoudnessCompensator.vst3 → `C:\Program Files\Common Files\VST3\
3. Restart your DAW and rescan plugins

Note: The VST3 format is cross-platform compatible. The same VST3 plugin file can work on both macOS and Windows with proper compilation.

 

[Auditory Cortex]

I would like to try this for music listening on normal music programs. I guess I need a VST wrapper so it can be contained in a VST2 plugin instance and then I should be able to use it on Equalizer APO (Windows), although the method doesn't always work.