Customer Return. Opened Box, Not Used

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.


  • 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

Product Specs

Mint (Used)
DI Boxes
Late 2018

About The Seller

Soundworks Systems Inc.
Joined May 2018
Stevens Point, WI, United States


Accepted Payment Methods

Shipping Policy

Ships from Stevens Point, WI, United States to:

Continental U.S.

WI Buyers must add 5.5% sales tax to purchase price.
Free shipping limited to the lower 48 states. Other regions pay actual additional shipping cost, please contact us for a shipping quote!!
As always, we will combine shipping with more than one purchase.

Tax Policies

This shop collects taxes in the following regions:

District of Columbia*
New Jersey*
South Carolina*
South Dakota*
*State sales tax is required in this region. Learn More

Return Policy

Return Window

This product can be returned within 30 days of receipt.

General Terms

Items must be returned in original, as-shipped condition with all original packaging and no signs of use. Buyer assumes responsibility for all return shipping costs unless the item was not received as described.


Buyer receives a full refund in their original payment method less any shipping costs and a 15% restocking fee.

Special Conditions

If you are unhappy with your purchase, or ordered the incorrect item, you may return your purchase within 30 days for an exchange, refund or credit for other merchandise. If the item included free shipping, the actual cost of shipping will be deducted from your refund. Product must be in the original packaging from the manufacturer, as delivered to you. All manuals, warranty cards, cables, etc, must be included. Credit towards another product will be calculated for the purchase price, minus the initial shipping cost, even if the item included free shipping. Refunds will be given for the purchase price, minus the initial shipping cost (even if the item included "free shipping"), plus a restock fee of 15%. Return items must be complete, with all accessories, & in "new" condition. Items returned incomplete, or showing any signs of use, or with damage, will be subject to refusal or an additional restock fee. If the product has been registered with the manufacturer, it cannot be returned.
Items that cannot be returned include earphones and headphones, as they are a personal item.

Message Seller

Accepted Payment Methods

Credit Card
Reverb Bucks

As low as $16/month

Soundworks Systems Inc.

Stevens Point, WI, United States
Joined: May 2018

Seller Achievements

Radial USB-Pro 24bit/96k DA Converter Laptop DI Box
+ Free Shipping