DFX for Windows Media Player - Plugin for Windows Media Player 9 and above, which greatly improves sound quality by improving the frequency characteristics and depth of stereo sound. He tightens the treble and bass, improves the separation of the channels and makes a few more details. As a result, music just comes alive, becomes clearer, deeper, more saturated. In DFX for Windows Media Player has a good selection of ready-mode for playback (presets). Besides, with the help of friendly equalizers can create their own scheme.

DFX for Windows Media Player to play sound improves the following areas:
- "Harmonic Fidelity Restoration" - compensation for the high frequency cutoff in the process of encoding
- "Ambience Processing" - compensates for the depth of sound and realizes "the effect of the environment"
- "3D Surround Processing" - function to create pseudo-good audio quality even at the two-column audio systems
- "Dynamic Gain Boosting" - compensation for "Trapped" play sound, making it "dynamic" sostavlyayushey and intensification of sound
- "HyperBass Boost" - compensates for the lower frequencies and is responsible for adding to the currently playing track deep and rich bass
- "Headphones Output Optimization" - used when listening to music with headphones. The module modifies the sound in such a way that the person creating the illusion that the sound source is not "sitting" directly in the ears, and is at the front, so the sound is subjectively more pleasant, natural and less tense.