USB-Pro™ Specifications

The Radial USB-Pro is a high performance USB audio interface that converts a digital audio source to a balanced analog audio output. The USB-Pro features 24 bit resolution for optimal signal transfer and maximum dynamic range. As with all Radial products, it is designed to be 'plug & play'': one merely plugs in and the USB-Pro powers up and is automatically recognized by the computer without the need of external drivers. A built in headphone provides a ready means for checking the audio and switchable isolation transformers help eliminate hum and buzz caused by ground loops that are often encountered in multi-media setups.

Radial J48 Block Diagram
Radial J48 Block Diagram

Specifications are subject to change without notice.
Audio circuit type: Custom decoder with analog 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
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: 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
Conditions: For use in dry locations only between 5°C and 40°C
Warranty: Radial 3-year, transferable