Description The ULTRA-DI DI400P is a passive DI (Direct Injection) box for connecting a guitar, bass or keyboard directly to your mixer. With the DI400P as your go-between, impedance-matching problems become a thing of the past, and long cable runs will not sacrifice all of your precious tone. With its parallel 1/4″ In and Out jacks, the DI400P allows you to plug in your instrument and send the same signal to your onstage amp, while the XLR Output sends a balanced signal to the mixer. Features Ground Lift switch.