For when you need to play backing tracks on stage, give a presentation, or be the "DJ" of an event, the Radial Engineering USB-Pro is an easy-to-use high-resolution stereo digital audio converter (DAC) and direct box that is designed to connect to any computer system to seamlessly transfer digital audio via USB to a pair of analog outputs.Functioning as both a 24bit/96kHz digital audio converter and a direct box, the USB-Pro gives you everything you need to plug and play from your computer or other digital device directly into a mixer or loudspeaker without hums or distortion. The standard USB type-B port makes this tool compatible with all popular operating systems including Windows and Mac. The headphone jack allows for quick monitoring of the sound quality before sending it off to the balanced stereo XLR outputs. The signal can alternatively be summed into mono with a click of a switch, and another switch provides a ground lift to protect against hum or buzz from ground loops. A set-it-and-forget-it output level attenuator is also on board to protect your loudspeaker from being pushed too hard.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.You could get a complicated USB interface, or you could risk awful ground loops and distortion by plugging in direct to your loudspeaker...or you could get the Radial USB-Pro today for an easy-to-use converter that gives you pristine quality every time.FeaturesHigh-performance 24-bit/96kHz digital audio converterPlug and play, no drivers required3.5mm headphone out to test signalsBalanced XLR outs feed to mixer or PAOutput level controlSpecificationsAudio Circuit Type: Custom decoder with analog line driveFrequency Response: 5 Hz to 40 kHz (30 Hz to 18 kHz with isolation)Dynamic Range: >90 dBGain: +8 dBuTotal Harmonic Distortion: 0.01%Noise: -90 dBData Compression:Software Compatiblity: Windows XP, Vista, Win7, Win8, Win10, MacOSSound File Compatiblity: WDM, MME, CoreAudio, DirectSound, WASAPI, and .WAVUSB 1.1 full speedSampling Rate: 44.1 / 48 / 96 kHz auto sensing75 dBu stereo separationFeatures: Mono sum, ground lift, level control, headphone outInput Connector: USB type-BOutput Connectors: 2 x XLR-M, 3.5mm TRS headphone outOutput Impedance (XLR): 250 Ω nominalConstruction: 14-gauge steelPower: USB bus-powered 500mA maximumConditions: For use in dry locations only, 5-40°CDimensions (H x W x D): 2" x 3.3" x 5.0"Weight: 1.5 lbs (0.68 kg) Radial Engineering USB-Pro USB Laptop Direct Box.