The question can be divided into two parts, whether you want to increase the sound of the multimedia playback on your system or increase the maximum volume of the overall system. I will discuss three methods to boost sound in Windows beyond 100% default.

Using Audio Enhancements

This method will enhance the maximum volume of the overall system. In Windows, there is a loudness equalization option supported by most sound cards which needs to be configured in order to make audio louder. Let’s go through the process step by step: This should increase the overall system sound effect to be more louder. But for any reason, your sound card does not support equalization, then you’ll need to go with the other options mentioned in this article.

Using Sound Booster Plugins

Second method is to use sound booster plugins. This is the most reliable and exciting option. But the problem is that there are not many free sound booster plugins available which have many options available for free. But we will list down a few plugins which can be used for boosting the overall volume of the system.

Audio Enhancer Bongiovi DPS Plugin

This is a commercial plugin but you can test it out using the trial version. It supports a lot of sound enhancement and equalization options. Bongiovi DPS plugin is available for Windows 7, Windows 8 and Windows 8.1. It also support Max OSX.

DFX Audio Enhancer Plugin

DFX Audio Enhancer is my favorite tool for enhancing the system volume on my system. DFX Audio Enhancer boosts the sound quality of audio playback of the overall system which includes your music, videos, Internet audio, games and other programs. This plugin comes with a free edition which has most of the configuration options disabled but it will be enough for a basic sound boost on your system.

SoundPimp

SoundPimp audio enhancer with High Definition Stereo enhances the overall listening experience of computer audio. I have not used SoundPimp but it seems good because it is available for all platforms including Windows, Mac OS and Linux.

Using VLC Player

If you only want to make your multimedia audio and video louder then you can use multimedia players which let you go beyond the 100% volume limit. One option is VLC Player which lets you increase the volume up to 125%. Also see:

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