Equalizer APO is a powerful open-source audio equalizer made for Windows users who want complete control over their sound. Created by Jonas Thedering, it lets you shape your listening experience with accuracy and flexibility.
What makes Equalizer APO special is its ability to use an unlimited number of filters across any number of audio channels. Whether you’re tuning a simple stereo setup or adjusting a full surround system, every change you make updates instantly so you can hear the results right away.
Many people combine Equalizer APO with Room EQ Wizard (REW) to achieve professional-quality acoustic analysis and sound calibration. When used together, they deliver a level of audio precision that’s hard to beat.