Radial JPC Direct BoxThe JPC is a stereo direct box that is easy to use with practically any consumer electronic device. It utilizes active buffers and transformer isolation to create a hybrid circuit that blocks ground loops and reduces system noise, along with AC blocking capacitors to prevent any audio system noise from bleeding back into the computer. The choice of ", RCA and 3. 5mm input connectors make it easy to interface with all types of unbalanced audio sources