Radial EngineeringUSB-Pro Stereo USB Laptop DI Direct Box


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Radial Engineering USB-Pro

The USB-Pro, from Radial, is a stereo DI box designed for the purposes of converting audio files sourced from a laptop or desktop and transfer them to a pair of outputs that can be fed to a PA, broadcast, or recording console.

One of the best aspects of the USB-Pro is its inherent ease-of-use. Simply connect it to a compatible device for instantaneous use. Once connected, the unit will automatically configure itself no matter the operating system used, effectively negating the need for tedious drivers. Even better, the USB-Pro features 24-bit/96kHz stereo connectors for enhanced detail and ample headroom, meaning users will not require additional sound cards or converters in order to transfer files.

USB-Pro Features

  • High performance 24bit/96k stereo direct box
  • Automatically installs without the need of a driver
  • Built-in headphone amplifier for monitoring
  • Balanced Lo-Z outputs with switchable isolation
  • Digital input: USB connector B-type
  • Analog 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
  • Audio circuit type: Custom decoder with analog line drive
  • USB compliance: USB 2.0 full speed
  • Bit depth: 24bit (16bit capable)
  • Sampling rate: 96kHz (44.1kHz / 48kHz auto sensing)
  • Sound file compatibility: WDM, MME, ASIO, CoreAudio and DirectSound
  • Software compatibility: Windows XP/Vista/Win7 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: 300Ω nominal
  • Power: USB bus powered 500mA maximum
  • Construction: 14 gauge steel chassis and outer shell, baked enamel finish
  • Size: 3.3" x 5.0" x 2" (84 x 127 x 48mm)
  • Weight: 1.5 lb (680 g)
  • FCC approval: Complies with section 15 of the FCC Rules
  • Warranty: Radial 3-year, transferable
Radial Engineering USB-Pro Stereo USB Laptop DI Direct Box Reviews