SOtM tX-USBexp is PCI express USB 3.0 host interface card designed to perform the ultimate USB audio functions. If you want to use a PC as a hi-end audio source device via USB connection, the various types of noise should be blocked from the inside of the digital devices. To reduce such types of noise, tX-USBexp has the special filter circuits, an Ultra low-noise Voltage regulator and an ultra-low jitter clock. tX-USBexp is also available to get powered from the external battery pack such as ‘mBPS-d2s’ through the external power input connector. You will hear the ultimate USB audio performance.