The world of PC audio is rapidly expanding to keep up with the next-gen listening style. Gearooz now offers the d+ USB cable which was originally designed for sound professionals, but now has functions as the core of the digital data transmission for PC audio. Because there is no change in the frequency balance of the cable during data transmission, the d+ USB cable delivers a clean and stable data stream for a USB-DAC and a MIDI Controller. One of the most important factors for a digital signal is loss of a speedy and accurate data transmission. A cable has many factors which affect sound quality and cause errors in data transmission such as noise by electro-magnetic waves, impedance matching, and attenuation of electric signal. Based on these basic concepts of the data transmission, the d+ has noise protection and excellent electric characteristics to counteract the factors that effect good transmission. The d+ USB was produced as a result of considering the best combination of structure, conduction, diameter, insulation, shielding, the sheath and even the contact pin of the connector.