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Boost Your Sound with Equalizer APO - A Low Latency and Low CPU Usage Equalizer for Windows

How to Download and Use Equalizer APO: A Complete Guide

If you are looking for a way to improve the sound quality of your Windows PC, you might want to try Equalizer APO. Equalizer APO is a free and open source software that allows you to apply various audio filters and effects to your system output. In this article, we will show you how to download, install, configure, and use Equalizer APO, as well as how to troubleshoot and uninstall it if needed.

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What is Equalizer APO and Why You Need It

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. This means that it can process any audio signal that passes through your PC, regardless of the application or device that produces it. You can use Equalizer APO to enhance your music, movies, games, or any other audio content.

Equalizer APO Features

Some of the main features of Equalizer APO are:

  • 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

  • VST plugin support

Integrates into Voicemeeter ( [15](

Equalizer APO Requirements

To use Equalizer APO, you need:

  • Windows Vista or later (currently only Windows 7, 8, 8.1, 10 and 11 have been tested)

  • The application must not bypass the system effect infrastructure (APIs like ASIO or WASAPI exclusive mode can not be used)

How to Download and Install Equalizer APO

The installation process of Equalizer APO is simple and straightforward. Here are the steps you need to follow:

Downloading Equalizer APO from SourceForge

You can download the latest version of Equalizer APO from [SourceForge](^1^). You need to choose the setup file that matches your Windows version (32 or 64 bit). If you are unsure about your system type, you can open Start Menu -> Control Panel -> System and look it up.

Installing Equalizer APO with Configurator

After downloading the setup file, run it and follow the instructions. Remember your installation path if you don't use the default of C:\\Program Files\\EqualizerAPO . During the installation process, the program Configurator.exe will be run. This program allows you to select the audio device(s) that you want to install the APO to. Make sure that you select the correct device(s), especially if you have multiple output devices. If you are unsure, you can open Start Menu -> Control Panel -> Sound and look for the default output device. If you need to install the APO to other audio devices later, you can run the Configurator again from C:\\Program Files\\EqualizerAPO\\Configurator.exe .

Rebooting Your System to Activate Equalizer APORebooting Your System to Activate Equalizer APO

After the installation is complete, you need to reboot your system for the changes to take effect. This is because the APO needs to be registered in the Windows registry and loaded into the audio service. Once you restart your PC, you should be able to use Equalizer APO with any application that uses the system audio output.

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How to Configure and Use Equalizer APO

Now that you have installed Equalizer APO, you can start configuring and using it to improve your sound quality. There are several ways to do this, depending on your preferences and needs. Here are some of the most common methods:

Opening and Editing the Configuration File

The simplest way to configure Equalizer APO is to edit the configuration file directly. The configuration file is a text file that contains the commands and parameters that define the filters and effects that are applied to the audio signal. You can find the configuration file in C:\\Program Files\\EqualizerAPO\\config\\config.txt . You can open it with any text editor, such as Notepad or Notepad++. You can also use the program Editor.exe from C:\\Program Files\\EqualizerAPO\\Editor.exe , which provides a graphical user interface for editing the configuration file.

The configuration file consists of lines that start with a command, followed by optional arguments separated by spaces. For example, the line Preamp: -6 dB means that a preamp filter with a gain of -6 dB is applied to the audio signal. You can add, remove, or modify any line in the configuration file to change the behavior of Equalizer APO. You can also use comments (lines that start with ;) to document your configuration or disable certain lines. For a complete list of commands and arguments, you can refer to the [documentation] or the [wiki] of Equalizer APO.

After you edit the configuration file, you need to save it and restart your audio application for the changes to take effect. You can also use the hotkey Ctrl+J to reload the configuration file without restarting your audio application.

Using Room EQ Wizard to Create Filters

If you want to create more advanced filters based on measurements of your room acoustics, you can use Room EQ Wizard (REW). REW is a free software that allows you to measure and analyze the frequency response of your speakers and room, and generate correction filters that can be imported into Equalizer APO. You can download REW from [here].

To use REW with Equalizer APO, you need:

  • A microphone that can capture sound accurately, such as a measurement microphone or a calibrated USB microphone

  • A sound card or audio interface that can output and input sound simultaneously

  • A cable or adapter that can connect the output of your sound card or audio interface to the input of your microphone

  • A stand or tripod that can hold your microphone at ear level

Here are the steps you need to follow:

  • Connect your microphone to your sound card or audio interface, and connect the output of your sound card or audio interface to the input of your microphone using a cable or adapter.

  • Launch REW and go to Preferences -> Soundcard. Select your sound card or audio interface as both the output device and input device, and select your microphone as the input channel.

  • Go to Preferences -> Mic/Meter and calibrate your microphone using a calibration file if available, or by measuring its sensitivity.

  • Go to File -> New Measurement and set up the measurement parameters according to your preferences. For example, you can choose the sweep length, sample rate, level, etc.

  • Place your microphone at ear level at your listening position, and make sure there are no obstructions between your speakers and your microphone.

  • Click on Start Measuring and follow the instructions on screen. REW will play a sweep tone through your speakers and record it with your microphone. It will then display a graph of the frequency response of your speakers and room.

  • Repeat steps 5 and 6 for different positions around your listening area, until you have enough measurements to cover your listening area.

  • Select all your measurements in REW and go to EQ -> Match Response To Target. This will open a window where you can set up a target curve for your frequency response, and generate correction filters based on it.

  • Adjust the target curve according to your preferences. For example, you can choose a flat curve, a house curve, or a custom curve. You can also adjust the filter parameters, such as filter type, bandwidth Adjust the filter parameters, such as filter type, bandwidth, gain, etc. You can also use the Auto EQ function to let REW choose the optimal filter settings for you.

Click on EQ Filters and select Equalizer APO as the equalizer type. This wi


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