Boom 3D - Audio enhancer with 3D surround sound
FxSound - Clearer Sound for Your PC. The new FxSound boosts your sound quality, volume, clarity and bass.
Equalizer APO - A system-wide equalizer for Windows 7 / 8 / 8.1 / 10 with channel remapping/copying capabilities
DeskFX Audio Enhancer - Download this free audio utility to refine, control & perfect the sound playing on your computer. Live audio effects include amplify, equalize, reverb, chorus and more. Studio quality sound from your PC or Mac in pure digital.
Dolby Home Theater - Dolby Home Theater v4 delivers a surround sound experience through a PCs built-in speakers, any pair of headphones, or a connected home theater system.
eqMac 2 - The open-source macOS audio optimizer 🎛️