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Radial USB-Pro USB Stereo DI Box

Radial USB-Pro USB Stereo DI Box



  • £250.00
Usually shipped within 2-3 working days

The Radial USB-Pro is a high-resolution stereo digital audio converter (DAC) and direct box that is designed to connect to any computer system to seamlessly transfer digital audio to analogue.

A stereo pair of balanced XLR audio outputs with adjustable level control then feeds the signal to a microphone preamplifier, PA system, mixing console or even a powered speaker! Made for plug and play simplicity, the USB-Pro will automatically be listed as an available sound card in the audio settings in all popular operating systems including Windows XP, Windows 7/8/10, and Mac OSX.

Connection to a computer is accomplished through a standard USB type-B port. Digital-to-analogue conversion can be monitored on headphones through the 3.5mm analogue output to check signal quality and level before connecting to a sound system. A mono-sum switch may be engaged to check for phasing or for connection to a mono system.

Should hum or buzz caused by ground loops be encountered, two recessed side-access switches allow the user to insert isolation transformers into the signal path. To further reduce susceptibility to noise, this is augmented with a ground lift switch that lifts pin-1 on both XLR jacks.

As with all Radial products, the USB-Pro is designed to handle the rigors of professional touring. Our unique book-end design creates protective zones around the switches, connectors and controls to keep them out of harm's way. Inside, our time-tested I-beam construction assures the sensitive internal PC board will not torque, which could cause premature part failure. Finally, a full bottom no-slip pad provides mechanical isolation and electrical insulation to ensure quiet operation.

Product Features:

  • High performance 24bit digital audio converter
  • Ready to use without the need of a driver
  • 3.5mm analogue headphone output to check signal
  • Balanced Lo-Z outputs with switchable isolation
  • Designed to handle the rigors of professional touring
  • No-slip pad provides mechanical isolation and electrical insulation

Product Specifications:


  • Audio circuit type: Custom decoder with analogue line drive
  • USB compliance: USB 1.1 full speed
  • Bit depth: 24bit (16bit capable)
  • Sampling rate: 44.1kHz / 48kHz / 96kHz auto sensing
  • Sound file compatibility: WDM, MME, CoreAudio, DirectSound, WASAPI and .WAV
  • Software compatibility: Windows XP/Vista/Win7/Win8/Win10 and Mac OS
  • Frequency response: 5Hz ~ 40kHz (30Hz ~ 18kHz with isolation)
  • Dynamic range: >90dB
  • Noise floor: -90dB
  • Maximum gain: +8dBu
  • Total harmonic distortion: 0.01%
  • Stereo separation: 75dBu
  • Output impedance: 250Ω nominal
  • Digital input: USB connector B-type
  • Analogue output: Stereo balanced mic level (2 x XLR-M)
  • Headphone output: 3.5mm 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 500mA maximum
  • Finish: Durable powder coat

Physical & Dimensions

  • Height: 48mm
  • Width: 127mm 
  • Depth: 84mm 
  • Weight: 1.5lb
    Manufacturer: Radial


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