The ULTRA-DI DI20 is a one-of-a-kind DI (Direct Injection) box that can convert up to two separate, unbalanced ¼ " TRS lines into two balanced XLR outputs. It also offers a 2-channel / link mode for flexible use as a mono-, 2-channel box or splitter. In link mode, channel 1 can be output simultaneously via the two balanced XLR outputs as well as via an unbalanced jack (6.3 mm). The 3-position input attenuator can accommodate input levels of up to +48 dBu and a "Ground Lift" switch eliminates ground loops. The power supply can either be done with a battery (9 V) or with phantom power (48 V).