www.radialeng.com ® True to the Music USB-PRO™ USB Direct Box User Guide Radial Engineering Ltd. 1588 Kebet Way, Port Coquitlam BC V3C 5M5 tel: 604-942-1001 • fax: 604-942-1010 info@radialeng.com • www.radialeng.
Radial USB-PRO ® ™ USB to Audio Direct Box Table of Contents Page Overview ..........................................................................1 Features............................................................................2 Getting started and audio connections.............................3 Testing and Using.............................................................4 Eliminating hum and buzz.................................................4 Using the headphone output.....................
True to the Music ® OVERVIEW The Radial USB-Pro is a plug and play, 24bit digital to analog audio converter and professional direct box in a compact and road rugged package. A typical direct box is a device that lets you interface a high impedance (hi-Z) audio output with professional low impedance (low-Z) PA and recording systems.
True to the Music ® FEATURE SET 1 2 3 4 5 6 7 8 1. LEVEL: Used to set the overall output level. 2. MONO: Sums the stereo signal to mono. When active, the LED indicator illuminates. Mono mode reduces the channel count on the PA or lets you send the signal to two separate audio systems simultaneously. 3. HEADPHONE: Mini 3.5mm (1/8”) TRS headphone output is used to check the output from the digital source for trouble shooting. Works with ear-buds and standard headphones. 4.
True to the Music ® Getting Started Before making any connections, always ensure your audio system is either turned down or turned off in order to protect more sensitive components from damage due to loud turn-on or plug-in transients. USB Connection As the USB-Pro uses a TYPE B USB connector, you will need a USB 2.0 cable that fits the USB port on your computer or laptop. This is a common ‘TYPE A to TYPE B’ USB cable that is compatible with the majority of printers, hard drives and audio interfaces.
True to the Music ® Testing And Using First, set the USB-Pro’s LEVEL control to the 7 o’clock (off) position. This will allow you to adjust the output level on the fly. Next, check the status of the MONO SUM switch and LED indicator. For stereo, set the switch to the outward position (LED off). For dual mono outputs, set the switch to the inward position (LED on). OUTPUT LEVEL MONO SUM LINE It’s a good idea to start testing your computer’s audio with a sound file you are familiar with.
True to the Music ® DIGIT Using the Headphone output The USB-Pro is also equipped with a stereo headphone output. This headphone amplifier is controlled by the master output level control, and is designed to be used to check signal before plugging into a PA system. Adjusting the level control on the USB Pro will affect both the XLR and the headphone output. The 3.5mm (1/8”) output is designed for both ear buds and standard TRS stereo headphones where tip-left, ring-right and the sleeve is ground.
THREE YEAR TRANSFERABLE LIMITED WARRANTY RADIAL ENGINEERING LTD. (“Radial”) warrants this product to be free from defects in material and workmanship and will remedy any such defects free of charge according to the terms of this warranty. Radial will repair or replace (at its option) any defective component(s) of this product (excluding finish and wear and tear on components under normal use) for a period of three (3) years from the original date of purchase.
