The Tube MP is the world's most popular external tube microphone preamp. Whether you're working with a digital, computer or analog recording system, the Tube MP's TEC award nominated design will allow you to obtain professional recording studio results at a fraction of the cost of comparable equipment. The hybrid design of the Tube MP allows it to add warmth and fatness to a signal while maintaining exceptionally low-noise and high quality. While its primary application is to be used with a microphone, the Tube MP is an exceptional direct box - impedance matching, amplifying and improving the sound of any instrument plugged into it. The TUBE MP features a single Type B USB peripheral connector on the rear panel for outputting audio over USB to your computer. The ART USB TUBE MP is fully USB 1.1 compliant, operating under Windows 98SE/ME/2000/XP/Vista, as well as Mac OS 9.1 or newer. Impedance: 600 Ohm. Dimensions: 127 x 139 x 50 mm. Weight: 680 g.