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Equalizer APO

A system-wide equalizer for Windows 7 / 8 / 8.1 / 10

4.5 Stars (94)
14,806 Downloads (This Week)
Last Update:
Download EqualizerAPO64-1.1.2.exe
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Equalizer APO is a parametric / graphic equalizer for Windows. It is implemented
as an Audio Processing Object (APO) for the system effect infrastructure
introduced with Windows Vista.

- virtually unlimited number of filters
- works on any number of channels
- very low latency, which makes it suited for interactive applications
- low CPU usage
- modular graphical user interface

- Windows Vista or later (currently only Windows 7, 8, 8.1 and 10 have been tested)
- Sound card driver must support APOs (this includes most onboard sound drivers)
- The application must not bypass the system effect infrastructure
(APIs like ASIO or WASAPI exclusive mode can not be used)

Equalizer APO is best used in conjunction with Room EQ Wizard (http://www.hometheatershack.com/roomeq/), because it can read its filter text file format.

Please have a look at the Wiki (http://sourceforge.net/p/equalizerapo/wiki/) for instructions on installation and configuration.

Equalizer APO Web Site


User Ratings

ease 1 of 5 2 of 5 3 of 5 4 of 5 5 of 5 4 / 5
features 1 of 5 2 of 5 3 of 5 4 of 5 5 of 5 4 / 5
design 1 of 5 2 of 5 3 of 5 4 of 5 5 of 5 4 / 5
support 1 of 5 2 of 5 3 of 5 4 of 5 5 of 5 4 / 5
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User Reviews

  • 1 of 5 2 of 5 3 of 5 4 of 5 5 of 5

    Opened in Editor tool "config.txt". Now no sound. Program just crashes on startup. Can't be used anymore.

    Posted 07/28/2016
  • 1 of 5 2 of 5 3 of 5 4 of 5 5 of 5

    ALERT !!! LOCKS OUT WINDOWS 10 BUILD 10586+ PCs !!! Equalizer apo IS STILL NOT UPDATED, it's STILL THE OLD 1.1.1 RELEASE, DON'T use it on a Windows 10 10586 PC, it will totaly locks you out, every apps or program that have sound will not open, you can't even uninstall it ! BEWARE THE VIRUS ! Contacting sourceforge about this right now.

    Posted 06/29/2016
  • 1 of 5 2 of 5 3 of 5 4 of 5 5 of 5

    I wanted to believe it is that good. But so many of the 5 star reviews sound contrived, and the forum has many criticisms and instances of failure and corruption. It is difficult to know the truth. It's difficult enough these days for the above average user to configure and control Windows 10, but then to face the prospect that installing an app such as this will corrupt the desktop...well, the only safe way is to use an imaging program so that the system can be restored.

    Posted 01/28/2016
  • 1 of 5 2 of 5 3 of 5 4 of 5 5 of 5

    EQ works fine... BUT a BIG BUT, the installation messed up window scaling in games. During installation I had GTA V in 720p running fullscreen. It switched to fullscreen with black borders. So now the image is tiny and centered. The same problem still after windows restart. Before installing there was not any problems with fullscreen scaling from non native resolution. I have thinkpad, windows8.1 pro, i7, intel HD4000 and nVidia GT740m. This just got really annoying... What did the install change? it should not f*** up my screen setups. There doesn't seem to be option in the intel driver settings, there is only one oprtion and I can not change it, it's selected all the time ("Maintain display scaling"). Also there isn't an scaling option in the nVidia setting either. Why did this happen????

    Posted 07/29/2015
  • 1 of 5 2 of 5 3 of 5 4 of 5 5 of 5

    I have a HP Pavillion 550-223 , with IDT sound card. This program locked everything up, rebooted with no sound. I had to uninstall the program and disable the audio driver in the control panel, and let it reboot, the first time it did not work, I tried it again, and it reinstalled the OEM sound driver(s). I saw the comment about only working with certain hardware, I had no idea what was in this computer, it was all OEM. It may work fine on different systems, just not this type of mass produced compute. I am sure the developer worked very hard on this and I am not taking anything away from them, it just doesn't work on this computer.

    Posted 06/06/2015
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Additional Project Details


English, German

Intended Audience

Advanced End Users, End Users/Desktop

User Interface

Non-interactive (Daemon), Qt

Programming Language




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