The USB-Pro Stereo USB Laptop DI from Radial Engineering is a high-resolution stereo direct box, designed to convert sound files from a laptop computer and seamlessly transfer them to a pair of balanced audio outputs to feed a PA, recording, or broadcast mixing console.
With the plug-and-play functionality, this easy-to-use unit automatically configures itself for use with all popular operating systems including Mac OS X, Windows XP, Vista, and Windows 7, thus eliminating the need to load special drivers. Unlike devices that are limited with 16-bit, 44.1 kHz conversion rates, it elevates the performance with true 24-bit, 96 kHz stereo converters to deliver more headroom and greater detail. This eliminates the need for additional sound cards or separate converters when transferring files, further streamlining production in busy work environments.
Connection from the laptop is done via the pro-audio standard USB type-B port. Digital-to-analog conversion is monitored with the built-in headphone amplifier to ensure the signal is being properly downloaded and converted. A mono-sum switch may be engaged to check for phasing or facilitate signal distribution to 2 outputs should this be preferred. You can simply set the output volume control to suit your needs. Should hum or buzz caused by ground loops be encountered, the 2 set & forget side-access switches let you insert isolation transformers into the signal path to block stray DC voltage offsets. To further reduce susceptibility to noise, this is augmented with a ground lift switch that lifts pin-1 on the 2 XLRs.
It is designed to handle the rigors of professional touring. Radial’s unique book-end design creates protective zones around the switches, connectors, and controls to keep them out of harm's way. I-beam construction on the inside assures the sensitive internal PC board will not torque, which could otherwise cause premature part failure. A full bottom no-slip pad in this unit provides mechanical isolation and electrical insulation.