Radial Engineering USB Pro

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 analog.

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, and Mac OSX.

Connection to a computer is accomplished through a standard USB type-B port. 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.

• 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

• 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 / 96kHz 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: 300 nominal

Features

• 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

General

• 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 5C and 40C