Equalizer APO
System-wide parametric/graphic equalizer for Windows implemented as an Audio Processing Object (APO).
Why it is included
Popular GPLv2 tool for room correction workflows (e.g. with REW) and global EQ without per-app hacks.
Best for
Windows audio tweakers, headphone EQ, and speaker room correction pipelines.
If you use Windows, Mac, or paid tools
System EQ alternative to Boom 3D (paid) and some OEM audio control panels on Windows.
Strengths
- System-wide effect
- Configurable via text
- Pairs with measurement tools
Limitations
- Incompatible with some exclusive/low-level audio APIs that bypass APOs
Good alternatives
Peace GUI for Equalizer APO · macOS/Linux use different stacks
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