Radial JDI Duplex mk4 Stereo Direct Box -10dB RCA connectors +4db XLR inputs Jensen transformer-equipped passive DI 100% isolation eliminates ground loops Ultra linear response from 10Hz to 40kHz Virtually zero phase & harmonic distortion Exceptional signal handling Eliminates hum and buzz from ground loops The Radial JDI Duplex is a full-feature, stereo passive direct box designed to enhance connectivity, reduce noise, and simplify the hectic life of the touring professional, broadcast engineer or AV integrator It is plug-and-play and easy to use while delivering the utmost sonic quality Like the Radial JDI, the Duplex employs two high-performance 'made in the USA' audio transformers and the same pristine audio signal path that has made the JDI the industry standard It features exceptional signal handling with virtually zero phase shift or harmonic distortion, while remaining linear across the entire audio spectrum