Optimized for Immersive Gaming Action through Precision Audio. The Xonar DGX sound card combines Dolby Headphone 5.1 high definition surround with ASUS own GX 2.5 gaming audio engine and an on-board headset amplifier. These result in accurate and deep audio that brings every nuance and sound across fully, making the new Xonar DGX an ideal sound card for gamers who want to remain totally aware of their play environments. Built-in Headphone AMP. Powers up every sound detail in gaming . 3 headphone Amp gain modes for different usage scenario Dolby Headphone for an immersive 5.1 surround imaging GX2.5 for realistic 3D audio effects Automatic jack-sensing front-panel output . Audio auto-switched from back to front with headphone plugged in!