Radial USB-PRO

Stereo USB Laptop DI

Order Code: USB-PRO
Our Price: $379.00

Take the drama out of your corporate audiovisual presentation with USB-PRO by Radial.

For anyone trying to get audio from a laptop, you may already have discovered that simply plugging a 3.5mm to 2 x 1/4" jack cable is not going to cut it every time. In fact, the ground loops and possible hum is so distracting, that it often makes the presentation unwatchable.

That's exactly where you need USB-PRO. It is equipped with isolation transformers that may be switched in to eliminate hum and buzz caused by stray DC voltage and ground loops.

Simply plug a USB cable from your laptop to the USB-PRO, and you then have full control over your stereo audio feed. 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.

...more info below...

Photo of Radial USB-PRO available from Factory Sound
  • Usb-pro
  • Usb-pro-control
  • Usb-pro-xlr


  • High performance 24bit digital audio converter
  • Ready to use without the need of a driver
  • 3.5mm analog headphone output to check signal
  • Balanced Lo-Z outputs with switchable isolation

More info - via Radial website:

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, and Mac OSX.

Digital-to-analog conversion can be monitored on headphones through the 3.5mm analog 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.


Audio circuit type: Custom decoder with analog line drive
USB compliance: USB 2.0 full speed
Bit depth: 24bit (16bit capable)
Sampling rate: 44.1kHz / 48kHz auto sensing
Sound file compatibility: WDM, MME, CoreAudio and DirectSound
Software compatibility: Windows XP/Vista/Win7/Win8 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


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


Power: USB bus powered 500mA maximum
Finish: Durable powder coat
Size: 84 x 127 x 48mm
Weight: 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