Equalizer APO


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

4.5 Stars (44)
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Equalizer APO is a parametric 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

- Windows Vista or later (currently only Windows 7, 8 and 8.1 have been tested)
- Sound card driver must support APOs (this includes most onboard sound drivers)
- The application must not bypass the system effect infrastructure
(possible by using special APIs like ASIO)

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 3 / 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 3 / 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

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

    hallo daar, ik draai windows 7 x64 met realtek high audio geluidskaart en ik heb een probleem, de EqualizerAPO64-0.9.2 sloopt de system effecten van de geluidskaart drivers, ik heb alles geprobeerd, eerst de EqualizerAPO64-0.9.2 installeren en daarna de laatste realtek drivers en tevens andersom maar krijg EqualizerAPO64-0.9.2 niet aan de praat. dat wil zeggen de EqualizerAPO64-0.9.2 werkt wel maar dan ben ik de systeem effecten kwijt, doe ik het andersom werken de system effecten wel maar niet de EqualizerAPO64-0.9.2, hebben jullie een oplossing voor dit probleem? mijn email is jwvdbosch@ziggo.nl bij voorbaat dank, nog 1 ding ik heb ook een x86 32 bit machine met windows vista waar EqualizerAPO64-0.9.2 gewoon correct werkt, maar wat raar is is als je naar de registry key van EqualizerAPO surft staan daar achter de child apo's de waarden !key en !value wat bij mijn windiws 7 x64 machine niet het geval is, wat is hier het verschil?

    Posted 06/11/2015
  • alexgromov
    1 of 5 2 of 5 3 of 5 4 of 5 5 of 5

    We need that soft, we use it, but we have no choice. It's almost one soft for DIGITAL audio outputs as HDMI. APO need more features, as bass effects, multichannel virtualization as Dolby ProLogic, basic GUI for beginners, extended programming manual for difficult effects, links to supported GUI projects, exclusive website with all links, manuals and forum to make extended community. REW is a great program, but absolutely unfriendly and it's not big deal with our filters and it doesn't seem to make changes just in fly for APO, that we need. I'll stay with you anyway, hope for new updates, thanks!

    Posted 03/12/2015
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Additional Project Details


English, German

Intended Audience

Advanced End Users, End Users/Desktop

User Interface

Non-interactive (Daemon)

Programming Language



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