With the new SOtM dX-USB-HD digital interface, it is possible to get a high resolution, ultra low jitter digital audio signal straight from your VortexBox.

Completely plug-and-play on your VortexBox appliance, this interface allows for Audiophile asynchronous USB playback up to 24 bit resolution at sampling rates up to 192 kHz.

This digital interface includes AES/EBU, SPDIF Toslink and SPDIF RCA ouputs to insure compatibility with your DAC of choice. This interface automatically switch's between USB power and external power. The external power source can be a battery or a linear supply. When using USB power the interface has a unique design incorporating an ultra low noise regulator circuit. This interface also has dual full size high quality oscillators.

• USB2.0 High Speed, USB Audio Class 2.0
• 16/24Bit 44.1/48/88.2/96/176/192kHz
• Asynchronous mode operation
• Indicate LED (Power, Sampling rate)
• Powered by the USB bus, or external power supply
• Power regulation circuit using ultra low noise regulators
• 400/500MIPS 32bit Multi-threaded Processors (XMOS)
• Ultra high speed RS422 driver for AES/EBU, Coaxial , Toslink
• High grade components: PPS film chip capacitor, conductive polymer capacitor, audio grade electrolytic capacitor
• Dual full size high quality oscillator (one for 44.1kHz family, another for 48kHz)
• 105mm x 53mm x 150mm (WxHxD)
• Approximately 490g

More info and pictures here.