For Sale: Radial USB-Pro Direct Box Condition: Brand new. Never used. Feel free to message me if you have any questions. — The Radial Engineering 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. Their unique book-end design creates protective zones around the switches, connectors and controls to keep them out of harm's way. Inside, Radial's 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. Applications: Using the USB-Pro with a laptop: Nothing is simpler than the USB-Pro. You plug it into your laptop and it automatically delivers your digital audio files to spectacular sounding stereo audio via the 24-bit digital to analog converters. You merely connect to the mic inputs on your mixing console or to any +4 line level device and you are set to go. Using the USB-Pro in the studio: Convert your client's files instantly. Simply connect the laptop to the USB-Pro and transfer files to the recording system at the maximum sample rate for best audio fidelity. The built-in headphone amp makes it easy to check for signal integrity. Using the USB-Pro for a video presentation: Anyone that has incorporated audio with a projector knows that noise can be a serious problem. The USB-Pro is equipped with isolation transformers that may be switched in to eliminate hum and buzz caused by stray DC voltage and ground loops. Radial Engineering USB-Pro Features: High performance 24-bit 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 Read Less