Radial Engineering (USB-PRO) Direct Box - USB

Stereo audio interface with balanced audio outputs

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What's in the box:

  • Radial Engineering USB-Pro Stereo USB Laptop DI
  • Limited 3-Year Transferable Warranty

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Radial Engineering's USB-Pro is an easy way to get high-quality 24-bit USB digital audio from your laptop or any computer out to your analog mixer, which is ideal if you want to use backing tracks during a performance or to play background music between sets or presentations. This plug-and-play interface works with Windows and Mac computers, and is equipped with a USB type-B input and a stereo pair of balanced XLR audio outputs with adjustable level control. There's also an 1/8" headphone jack that can be used to monitor the signal before connecting to your PA system to make sure everything is sounding good.


  • High performance 24-bit digital audio converter
  • Plug-and-play, ready to use without the need for a driver
  • 1/8" (3.5 mm) analog headphone output to check signal
  • Balanced Lo-Z XLR outputs with switchable isolation

Specifications for the Radial Engineering (USB-PRO) Direct Box

{ "Audio Circuit Type" : "Custom decoder with analog line drive", "USB Compliance" : "USB 2.0 full speed", "Bit Depth" : "24-bit (16-bit capable)", "Sampling Rates" : "44.1 kHz, 48 kHz, 96 kHz auto-sensing", "Sound File Compatibility" : "WDM, MME, CoreAudio, and DirectSound", "Software Compatibility" : "Windows XP/Vista/7/8 and Mac OS", "Frequency Response" : "5 Hz - 40 kHz (30 Hz - 18 kHz with isolation)", "Dynamic Range" : ">90 dB", "Noise Floor" : "-90 dB", "Maximum Gain" : "+8 dBu", "Total Harmonic Distortion" : "0.01%", "Stereo Separation" : "75 dBu", "Output Impedance" : "300 Ohms nominal", "Digital Input" : "USB connector type-B", "Analog Output" : "Stereo balanced mic level, 2x XLR-M", "Headphone Output" : "1/8" (3.5 mm) TRS", "Level Control" : "Variable, works on headphone and XLR outputs", "Isolation" : "Switchable for each channel", "Mono Switch" : "Sums left & right inputs to mono", "Ground Lift" : "Lifts pin-1 on both XLR outputs", "Power" : "USB bus powered 500 mA maximum", "Finish" : "Durable powder coat", "Size" : "3.3" x 5.0" x 2.0" (84 x 127 x 48 mm)", "Weight" : "1.5 lbs (680 g)", "FCC Approval" : "Complies with section 15 of the FCC Rules", "Conditions" : " For use in dry locations only between 5°C and 40°C", "Warranty" : "Radial 3-year, transferable " }

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