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tX-USBexp Audiophile-quality PCI Express USB Card
(2 customer ratings)

SOtM Audio tX-USBexp Audiophile-quality PCI Express USB Card

An affordable audiophile-quality USB card designed to allow an electrically clean connection to be made between your PC and your DAC.

The SOtM tX-USBexp is an advanced audiophile PCIe to USB 3.0 interface like no other. SOtM has designed this card to provide a USB 3.0 port with the highest possible power and signalling quality so that an external USB DAC audio card can be connected to a PC without the 'dirty' power and data lines from the PC in any way affecting the purity of the audio quality from the DAC unit. By using noise filters and other isolation and electrical improvement circuitry, the SOtM USB card will allow the audio quality of your USB DAC to really shine through. If you have a DAC which doesn't need USB power, a switch on the card can be moved to the off position which will stop any power being sent from the PC to the DAC.

The card has a unique design incorporating a new and improved ULNR (ultra low noise regulator) for digital signalling, clock and USB power circuitry. It has power input noise filters, PCI Express slot noise filters, an extremely low jitter clock and an active noise canceller for clock power. For best driver compatibility and performance, we recommend using Windows 8 over Windows 7 where possible because Windows 8 has built-in support for USB 3.0 including the TI chipset used in the SOtM tX-USBexp.


  1. Provides a fully filtered USB 3.0 port to allow connection to an external DAC
  2. Ripple and RF filters are used to block noise from the PC power lines
  3. ULNR - Ultra Low Noise Regulator power regulation circuit with 2nd stage noise filter
  4. PCI Express x1 Gen2 interface with standard and low-profile brackets included
  5. Choice of power source - internal 4-pin HDD-type connector or external PSU (not included)

Product nameSOtM tX-USBexp
USB portUSB 3.0 compliant xHCI host controller with port power on/off function
USB compatibilityUSB 3.0, USB 2.0, USB 1.1
PCIe portPCI Express x1 Gen2 interface
ProtectionOver current and ESD
Power regulation circuitULNR - Ultra Low Noise Regulator with 2nd stage noise filter
Clock circuitUltra low phase noise clock with active noise reduction regulator and
Power supplyAutomatic selected external power input with PPL power supply filter
Input current2A max
Internal power input voltage+12.0Vdc (±0.5V)
Internal power connector5.5mm OD x 2.1mm ID DC adapter jack
External power input (PSU not included)+6.5V ~ +9Vdc
Power source selectAutomatic (external first, then internal)
USB port output voltage+5.0V (+0.5V, -0.25V)
USB port output current1.5A at 20°C
Recommended output current0.5A
Operating temperature0°C ~ 30°C
Storage temperature-10°C ~ 50°C
Operating & storage humidity10% ~ 90%
OS supportLinux, Windows 7, Windows 8
Included in the boxWindows driver disk, full-size and low-profile PCI back plate
Warranty24 months

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