Hi-Res 7.1 Super X-Fi USB DAC With Headphone Amplifier Switch The Sound Blaster X3 is a high-resolution, 7.1 multi-channel, Super X-Fi USB DAC Amp capable of 32-bit / 192kHz playback. Enjoy out-of-the-world holographic audio experience on your movies and games with the 15-CES award winning Super X-Fi technology, Sound Blaster Acoustic Engine audio enhancement, 600 headphone amplifier. The Sound Blaster X3 features a large volume knob for convenient control of playback and microphone input volume. Buttons to easily switch input / output of sources. Dolby Digital Live encoding allows a single cable connection to external Dolby receiver for multi-channel audio playback.